Starting JägerMonkey
About 2 months ago, we started work on JägerMonkey, a new “baseline” method JIT compiler for SpiderMonkey (and Firefox). The reason we’re doing this is that TraceMonkey is very fast for code that traces well, but for code that doesn’t trace, we’re stuck with the interpreter, which is not fast. The JägerMonkey method JIT will provide a much better performance baseline, and tracing will continue to speed us up on code where it applies.
This week, we’ve been sprinting to bring up the basic compiler, and as of today, JägerMonkey implements enough JavaScript to run all of SunSpider in “Jäger mode” and is 18% faster than the interpreter. And we haven’t done that many optimizations yet–there are many more things we will do (see the wiki article).
In the rest of this post, I’ll give a little more background on why we’re doing this, and a summary of what we’ve done so far.
Why JägerMonkey. TraceMonkey’s tracing JIT is very fast for code that it can JIT. For example, it is 9x faster than the interpreter on SunSpider’s math-cordic benchmark. But it can’t really trace a benchmark like date-format-tofte, which calls eval in its main loop, so tracing only yields a 5% speedup on that program. As David Anderson put it, TraceMonkey has rocket boosters, so it runs really fast when the boosters are on, but the boosters can’t always be turned on.
(See also the hacks article for much more background on how tracing works.)
There are many factors that can prevent the rockets from turning on, so there’s really no short description of the programs that don’t trace, but most of them fall into a few categories:
- Programs with very branchy control flow. Tracing works by generating type-specialized native code for program paths. So if a program has 1000 paths in its hottest loop, TraceMonkey would have to generate 1000 paths to run it natively with tracing. But that would use up way too much memory for code, so instead TraceMonkey stops after a certain number of paths and falls back to the interpreter. Another problem with branchy code is that generating a trace takes time, so if there are many branches and each branch is run fewer times, TraceMonkey gets less benefit for the cost of compiling.
- Programs with many type combinations. Because TraceMonkey generates type-specialized code, it must generate a separate trace for every type combination (mapping of variables to types) the program generates. If there are 1000 type combinations, we have the same problems we get with 1000 paths.
- Programs that call
evalin their hot loops. TraceMonkey needs to know all the variables and their types in order to generate type-specialized code. Becauseevalcan potentially do anything, TraceMonkey must give up when it sees aneval. There are a few other language features and corner cases that TraceMonkey can’t trace for similar reasons.
These untraceable programs are a result of two basic design factors:
- Trace JIT vs. method JIT. A method JIT compiles each statement in a method once, while a trace JIT may need to compile a statement many times if it is contained in many traces. So a method JIT isn’t hurt by branchy code.
- Mandatory type specialization vs. type specialization lite. A JIT that always type specializes has trouble with code that uses too many type combinations, or special features like
eval. A JIT that doesn’t type specialize doesn’t have those problems. A JIT that type specializes only a little bit, or only optionally, also avoids those problems.
Note that although a tracing JIT can either type specialize or not, and a method JIT can also type specialize or not, type specialization is a natural companion of tracing. Consider code like this:
var x;
if (z) {
x = 3;
} else {
x = "hello";
}
var y = x + 77;
A trace JIT will compile two traces, which look something like this:
// trace 1 if (!z) exit this trace; x = 3; y = x + 77; // trace 2 if (z) exit this trace x = "hello"; y = x + 77;
Notice how the types of x and y are completely known, so it is relatively easy to completely type-specialize this code. Accordingly, TraceMonkey is designed to always type-specialize everything. On the other hand, a method JIT compiles the whole method just once, so the method JIT really can’t know the type of y, and must generate non-specialized code.
(But a method JIT can type-specialize, and a trace JIT doesn’t have to. For example, a trace JIT could choose to generate non-specialized code. But then the JIT becomes more complex–it needs a notion of “unknown” types and it needs separate code generation functions to handle those cases. And a method JIT could look ahead to see that there are only 2 different types, and generate two type-specialized cases. Or it could even decide to duplicate the assignment to y inside the branches so that it can be type-specialized. But again, this makes the JIT more complex than the basic non-specializing method JIT design.)
So, a type-specializing trace JIT generates really fast code, but can’t generate native code for the situations described above. Conversely, an optionally specializing method JIT generates moderately fast code, but can generate native code for any JavaScript program. So the two techniques are complementary–we want the method JIT to provide good baseline performance, and then for code that traces well, tracing will push performance even higher.
JägerMonkey so far. Now I’ll say a little more about what we’ve done so far on JägerMonkey.
The first thing we needed was a fast assembler to generate the native code. TraceMonkey has a native code compiler, nanojit, but we thought nanojit wasn’t ideal for JägerMonkey. Nanojit does a fair number of compiler backend optimizations, like dead store elimination and common subexpression elimination, which allows to generate faster code, but makes it take longer to generate that code. We don’t expect those optimizations to help much in the Jäger domain, so we wanted something simpler and faster.
We decided to import the assembler from Apple’s open-source Nitro JavaScript JIT. (Thanks, WebKit devs!) We know it’s simple and fast from looking at it before (I did measurements that showed it was very fast at compiling regular expressions), it’s open-source, and it’s well-designed C++, so it was a great fit. Julian Seward modified it to run with our build system and support libraries. It’s in our tree with the appropriate licensing, and we’re already using it to get that 18% speedup I mentioned before.
Another key component is the method JIT compiler itself, which David Anderson designed and started up. Right now it’s pretty basic but works well, so I don’t have a lot more to say about it right now. One interesting note is that David created a new function that does abstract interpretation of the bytecode in order to compute stack depths and incoming branch edges. The compiler uses the results to do some optimizations that gave us another 5% speedup or so.
Finally, as part of the JägerMonkey project, we are going to make a bunch of changes to the interpreter to make it more amenable to JIT optimization. The first change, done by Luke Wagner, was to simplify the stack the interpreter uses to store temporary values and JavaScript stack frames. Previously, stack frames were laid out in a linked list of memory chunks, which keeps stack memory usage very low, but complicates the allocation of new stack frames and addressing of variables and values stored on the stack. Luke changed it to use a single “slab o’ memory”, so allocating a new stack frame is just a size check and pointer increment, and values and variables are always at fixed offsets from the stack frame headers. This makes it easier to write the JIT and easier to generate simple, fast code to access stack values. We were pleasantly surprised to find that the stack rearrangement alone gave a 3-5% speedup, both in the interpreter and JägerMonkey.
At this point, everything’s looking good. The next step is to integrate JägerMonkey with tracing, so we can use them complementarily. We’ll also be continuing with the interpreter upgrades and simplifications. Finally, I’m going to try science to learn more about existing JavaScript code and how best to design JägerMonkey to run it fast.
Posted: February 26th, 2010 under Uncategorized.
Comments: 455
Comments
Comment from Jan
Time: February 26, 2010, 3:35 pm
Great post, thanks. JaegerMonkey looks interesting. Can it run the V8 benchmark yet? I’m asking because that benchmark is also hard to trace, right?
Nit: shouldn’t that be Luke Wagner instead of Luke Wilson? 
Pingback from Ajaxian » Mozilla JägerMonkey: Method based JIT + Trace based JIT = speed
Time: February 26, 2010, 9:06 pm
[...] learn more from David Mandelin and David [...]
Comment from Luke Wagner
Time: February 26, 2010, 9:33 pm
@Jan: Actually, we decided that we needed the Star Power, so we’re giving him the credit
Comment from Boris
Time: February 26, 2010, 11:04 pm
David, is that 18% speedup of JM without tracing over spidermonkey interp, or is that 18% speedup of JM + tracing over spidermonkey + tracing? I assume the former?
Pingback from Mozilla JägerMonkey: Method based JIT + Trace based JIT = speed – Programming Blog
Time: February 27, 2010, 12:07 am
[...] learn more from David Mandelin and David [...]
Comment from njn
Time: February 27, 2010, 12:55 am
Will the interpreter still be needed once JaegerMonkey is finished?
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Time: February 27, 2010, 5:40 am
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Pingback from Mozilla schickt Jägermonkey ins Rennen « Browser Fuchs
Time: February 27, 2010, 5:57 am
[...] David Anderson in einem Blogeintrag zusammengefasst. Der ebenfalls am Projekt beteiligte David Mandelin beschreibt im Detail, wie die Geschwindigkeitssteigerung [...]
Comment from Paul
Time: February 27, 2010, 7:27 am
Really good article.
Maybe this is the right way.
Pingback from Mozilla Boost Firefox Javascript
Time: February 27, 2010, 9:19 am
[...] David Madelin claims on Mozilla blog, TraceMonkey’s tracing JIT is very fast, it is 9x faster at certain operations such as [...]
Comment from foo
Time: February 27, 2010, 11:01 am
Oh boy, more embedded/forked code copies!
Pingback from Mozilla Dev: Starting JägerMonkey « Netcrema – creme de la social news via digg + delicious + stumpleupon + reddit
Time: February 27, 2010, 11:31 am
[...] Mozilla Dev: Starting JägerMonkeyblog.mozilla.com [...]
Pingback from Early work on Firefox’s new Javascript engine nets big speed gains | Tech Industry News
Time: February 27, 2010, 12:13 pm
[...] results. Where JägerMonkey can do its stuff, performance gains of 30-40% have been noted. Mozilla’s Dave Mandelin like what he sees so far, reporting the “JägerMonkey implements enough JavaScript to run all of SunSpider in [...]
Pingback from Early work on Firefox’s new Javascript engine nets big speed gains | World Wide Web
Time: February 27, 2010, 12:33 pm
[...] results. Where JägerMonkey can do its stuff, performance gains of 30-40% have been noted. Mozilla’s Dave Mandelin like what he sees so far, reporting the “JägerMonkey implements enough JavaScript to run all of SunSpider in [...]
Comment from Ben
Time: February 27, 2010, 2:49 pm
Dare I ask why you can’t just disable the optimizations in nanojit?
Comment from jmdesp
Time: February 27, 2010, 3:44 pm
It’s good to optimize the non-jit cases, but the competition is strong enough to defy you even when on pages where TM should be very effective
On the RSA key generation here http://www-cs-students.stanford.edu/~tjw/jsbn/rsa2.html , on my netbook (ATOM 1,3Ghz), chrome 4.0.249.89 averaged at 445 ms to generate a 512 bits key, and Firefox 3.6 at 6500 ms, more than 10 times slower (I took a large number of sample, 72 for chrome, 96 for Firefox, since the number can vary quite strongly between each run, the number of tries before you find a prime being purely random).
And Firefox is even much slower than that with JIT disabled, this is not a case of TM given up on the page. Which would be very surprising since, similar to your SHA1 test case, it’s pure raw mathematics, and not strongly recursive.
Pingback from Early work on Firefox’s new Javascript engine nets big speed gains | bibeh.com
Time: February 27, 2010, 7:27 pm
[...] results. Where JägerMonkey can do its stuff, performance gains of 30-40% have been noted. Mozilla’s Dave Mandelin like what he sees so far, reporting the “JägerMonkey implements enough JavaScript to run all of SunSpider in [...]
Pingback from Early work on Firefox’s new Javascript engine nets big speed gains | Techno Portal
Time: February 27, 2010, 8:49 pm
[...] results. Where JägerMonkey can do its stuff, performance gains of 30-40% have been noted. Mozilla’s Dave Mandelin like what he sees so far, reporting the “JägerMonkey implements enough JavaScript to run all of SunSpider in [...]
Pingback from JaegerMonkey, Opera 10.5 Beta, Mozilla Ubiquity And 3 New Chrome Extensions [Browser Saturday]
Time: February 27, 2010, 9:09 pm
[...] Dave Mandelin and David Anderson have blogged about this project. David writes: Mozilla’s JavaScript optimizer, [...]
Pingback from 【译稿】JaegerMonkey――Firefox最新JavaScript引擎初探 « 每日IT新闻，最新IT资讯，聚合多站点消息，保证你与世界同步
Time: February 27, 2010, 10:00 pm
[...] Mozilla的开发团队正在忙着测试比较，替换JavaScript引擎前后的性能比较。取得的积极成果素：JägerMonkey引擎在性能上提升了30-40%。目前Mozilla的JavaScript团队的David Mandelin表示看好，报告称在“Jäger模式”下，Sunspider测试下JägerMonkey引擎提升18%的JavaScript 编译速度。她表示：“我们没有这样做，但是做了许多优化，还有更多的事情 ， 我们都会做的。” [...]
Pingback from Early work on Firefox’s new Javascript engine nets big speed gains | Www.cyberquestnetwork.com
Time: February 27, 2010, 10:54 pm
[...] results. Where JägerMonkey can do its stuff, performance gains of 30-40% have been noted. Mozilla’s Dave Mandelin like what he sees so far, reporting the “JägerMonkey implements enough JavaScript to run all of SunSpider in [...]
Pingback from David Mandelin's blog » Starting JägerMonkey | Drakz blogging Online Service
Time: February 28, 2010, 12:40 am
[...] David Mandelin's blog » Starting JägerMonkey Share and [...]
Comment from koob
Time: February 28, 2010, 1:59 am
fat version Nitro?
Comment from jmdesp
Time: February 28, 2010, 3:26 am
It’s good to optimize the non-jit cases, but the competition is strong enough to defy you even when on pages where TM should be very effective
On the RSA key generation here http://www-cs-students.stanford.edu/~tjw/jsbn/rsa2.html , on my netbook (ATOM 1,3Ghz), chrome (version 4.0.249.89) averaged at 445 ms to generate a 512 bits key, and Firefox 3.6 at 6500 ms, more than 10 times slower (I took a large number of sample, 72 for chrome, 96 for Firefox, since the number can vary quite strongly between each run, the number of tries before you find a prime being purely random).
But after some more test, with the latest firefox tracemonkey nightly, I got enough wildly varying results that I understood that even with a quite large number of samples the page as it is is not very usable as it for precise performance measurements, you’d need to remove the random effects.
Pingback from Early work on Firefox’s new Javascript engine nets big speed gains !!
Time: February 28, 2010, 4:45 am
[...] [...]
Comment from Dan
Time: February 28, 2010, 9:50 am
Is it known what types of interpreter/tracer/JIT/assembler/whatever everyone uses (as in Apple, Google and Opera)?
Pingback from Firefox Hardware Acceleration
Time: February 28, 2010, 9:56 am
[...] David Madelin claims on Mozilla blog, TraceMonkey’s tracing JIT is very fast, it is 9x faster at certain operations such as [...]
Comment from Lino
Time: February 28, 2010, 2:05 pm
FYI: PyPy uses a tracing JIT and it can JIT-compile even code dynamically generated inside an eval().
I don’t know how they do that.
Pingback from Nuevo motor JavaScript para Firefox promete entre un 30 y 40% de velocidad | MadBoxpc.com
Time: February 28, 2010, 7:23 pm
[...] también agrega que aun tienen muchas optimizaciones que hacer en este motor y sólo llevan poco más de 2 meses de [...]
Pingback from Mozilla JägerMonkey: Method based JIT + Trace based JIT = speed « BrightSpark
Time: February 28, 2010, 8:16 pm
[...] learn more from David Mandelin and David [...]
Comment from Frikky
Time: February 28, 2010, 9:02 pm
If can make a lousy slow rendering engine 10% faster than its current speed, it will still remain a lousy slow rendering engine.
Firefox might be lucky for other people creating add-ons, that’s the only reason Firefox is still standing. Mozilla crew are a bunch of noobs.
Pingback from Firefox 最新 JavaScript 引擎初探 | My Sky
Time: February 28, 2010, 9:34 pm
[...] 30% ～ 40%。MySkyMozilla 的 Dave Mandelin 对此表示乐观，他说，JägerMonkey 在执行执行全部 SunSpider 脚本的时候，Jäger [...]
Pingback from Firefox: pronto un nuovo motore JavaScript, per battere tutti | TUXJournal.net
Time: February 28, 2010, 11:34 pm
[...] fino al 30-40%. Per il momento non sappiamo ancora in quale versione debutterà JägerMonkey ma sul blog di David Mandelin potete leggere altre informazioni sul nuovo, promettente, motore JavaScript per [...]
Pingback from Mozilla – Jägermonkey geht an den Start | Unified Blog
Time: February 28, 2010, 11:36 pm
[...] Entwickler David Anderson in einem Blogeintrag zusammengefasst. Der ebenfalls am Projekt beteiligte David Mandelin beschreibt im Detail, wie die Geschwindigkeitssteigerung [...]
Comment from dustin
Time: March 1, 2010, 1:11 am
@Frikky: You sound like a fun guy to hang out with at parties.
Pingback from Firefox最新JavaScript引擎初探 « 燕之庐网站建设
Time: March 1, 2010, 1:23 am
[...] 30% ～ 40%。Mozilla 的 Dave Mandelin 对此表示乐观，他 说，JägerMonkey 在执行执行全部 SunSpider 脚本的时候，Jäger 模 [...]
Pingback from Enable Firefox GPU Hardware Accelerated Graphics
Time: March 1, 2010, 1:26 am
[...] of Firefox by 30% to 45%, with room for lots of further improvements.You may want to check out the blog post by David Mandelin, which offers specific high-level information on starting the JaegerMonkey [...]
Pingback from Habilitar Aceleracion grafica en Firefox nightly build | Geek.pe hardware,tecnologia y demas
Time: March 1, 2010, 6:41 am
[...] posible que desee revisar este post en el blog de David Mandelin, que ofrece información específica del motor JaegerMonkey, y este post por David Anderson, [...]
Pingback from Elements of Firefox overhaul arrive for testing | Easybranches.com™
Time: March 1, 2010, 7:38 am
[...] to JaegerMonkey programmer David Mandelin’s description, Mozilla decided to build on the Nitro JavaScript engine for the new [...]
Pingback from Engenheiros da Mozilla revelam planos para ampliar a performance de JavaScript do Firefox | MacMagazine
Time: March 1, 2010, 8:21 am
[...] em andamento para contornar essa situação no futuro. Dois engenheiros da empresa revelaram detalhes sobre a próxima edição do JavaScript engine do navegador (atualmente conhecida [...]
Pingback from Thai Brothers’ Sharing Blog » Blog Archive » Elements of Firefox overhaul arrive for testing
Time: March 1, 2010, 8:25 am
[...] to JaegerMonkey programmer David Mandelin’s description, Mozilla decided to build on the Nitro JavaScript engine for the new [...]
Pingback from The Cheap Computer Geek » Blog Archive » Elements of Firefox overhaul arrive for testing
Time: March 1, 2010, 9:25 am
[...] to JaegerMonkey programmer David Mandelin’s description, Mozilla decided to build on the Nitro JavaScript engine for the new [...]
Pingback from Firefox Borrows a Bit of Safari’s Magic to Speed Up JavaScript – Programming Blog
Time: March 1, 2010, 11:13 am
[...] from Apple’s open source Nitro JavaScript engine. As JagerMonkey programmer David Mandeli writes on his blog: “we know [Nitro] is simple and fast from looking at it before… it’s open-source, [...]
Comment from skierpage
Time: March 1, 2010, 11:51 am
There’s a lot of Mozilla-specific JavaScript in the products and extensions, so is there a way to detect slow blocks of code that TraceMonkey could run faster with minor adjustments (?? maybe local variables with let, reduce use of polymorphic variables, use language features like iterators and generators).
Pingback from Media Blog » Blog Archive » Firefox Borrows a Bit of Safari’s Magic to Speed Up JavaScript
Time: March 1, 2010, 12:30 pm
[...] from Apple’s open source Nitro JavaScript engine. As JagerMonkey programmer David Mandeli writes on his blog: “we know [Nitro] is simple and fast from looking at it before… it’s open-source, [...]
Comment from Antony Williams
Time: March 1, 2010, 12:52 pm
great article.
could you explain why you didn’t choose Google’s V8?
Pingback from Elements of Firefox overhaul arrive for testing | penlau software
Time: March 1, 2010, 3:15 pm
[...] to JaegerMonkey programmer David Mandelin’s description, Mozilla decided to build on the Nitro JavaScript engine for the new [...]
Comment from roy_hu
Time: March 1, 2010, 3:40 pm
How about other competitors’ JIT compilers? Like Google v8?
Comment from roy_hu
Time: March 1, 2010, 7:03 pm
Sorry I wasn’t clear. I meant to ask if all other JIT compilers were method JITters.
Comment from njn
Time: March 1, 2010, 8:14 pm
If we do method-at-a-time compilation with JaegerMonkey, will that method still be able to converted to trace compilation? Seems important.
Pingback from Firefox Borrows a Bit of Safari’s Magic to Speed Up JavaScript | Blogsthatfollow.com
Time: March 2, 2010, 1:30 am
[...] from Apple’s open source Nitro JavaScript engine. As JagerMonkey programmer David Mandeli writes on his blog: “we know [Nitro] is simple and fast from looking at it before… it’s open-source, [...]
Pingback from Elements of Firefox overhaul arrive for testing » اینترنت یکجا دانلود کنید
Time: March 2, 2010, 5:56 am
[...] to JaegerMonkey programmer David Mandelin’s description, Mozilla decided to build on the Nitro JavaScript engine for the new [...]
Pingback from The road back to par: Radical reconstructive surgery planned for Firefox 4.0 / Information Technology Leader
Time: March 4, 2010, 11:18 pm
[...] example of just one kind of fallback exception that happens frequently was described in a recent blog post by Mozilla contributor David Mandelin: “Tracing works by generating type-specialized native code for program paths. So if a program [...]
Pingback from Mozilla borrows from WebKit to build fast new JS engine « 567 Technology
Time: March 9, 2010, 7:09 am
[...] will continue to speed us up on code where it applies," wrote developer David Mandelin a blog entry about the new [...]
Pingback from Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox] | Geek News and Musings
Time: March 9, 2010, 7:20 am
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Pingback from Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox] | Digital Digg Blog
Time: March 9, 2010, 7:24 am
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Pingback from Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox] | Phatboi's Blog-Roll
Time: March 9, 2010, 7:24 am
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Pingback from Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox] | World Wide Web
Time: March 9, 2010, 7:58 am
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Pingback from Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox] · TechBlogger
Time: March 9, 2010, 8:00 am
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Pingback from Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox] | bruno trani dot info
Time: March 9, 2010, 8:02 am
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Pingback from Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox] | Hooked On 'Tronics
Time: March 9, 2010, 8:46 am
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Pingback from Firefox’s Next JavaScript Engine Will Borrow From WebKit | Lifehacker Australia
Time: March 9, 2010, 10:02 am
[...] Mozilla’s home-brewed JavaScript engine for its Firefox browsers, TraceMonkey, has impressed us before, but in the raw benchmark game, it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. [...]
Pingback from Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox] | TechBlogs Today
Time: March 9, 2010, 12:44 pm
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Pingback from Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox] | Tech News From All Over The Net
Time: March 9, 2010, 1:09 pm
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Comment from Ricardo
Time: March 10, 2010, 5:49 am
Carakan is better !!!! Opera rules !!!!
Pingback from TecNews: Noticias Tecnofagia
Time: March 10, 2010, 9:32 am
[...] Com o objetivo de modificar essa situação, os desenvolvedores do Firefox trabalham em um novo mecanismo JavaScript, que recebeu o nome JägerMonkey. [...]
Pingback from The Far Edge » Blog Archive » Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox]
Time: March 10, 2010, 2:21 pm
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Pingback from JägerMonkey | World Wide Web
Time: March 10, 2010, 7:29 pm
[...] View full post on Daring Fireball [...]
Pingback from Mozilla JägerMonkey: Method based JIT + Trace based JIT = speed | pro2go Designs Blog
Time: March 10, 2010, 9:42 pm
[...] learn more from David Mandelin and David [...]
Pingback from Mozilla JägerMonkey: Method based JIT + Trace based JIT = speed | cadiviempresas.com
Time: March 10, 2010, 9:44 pm
[...] learn more from David Mandelin and David [...]
Comment from Don
Time: March 10, 2010, 10:40 pm
Stop wasting time on Javascript speed and start making DOM blazing fast!!
Faster DOM will make Firefox destroy all other browsers on actual websites using AJAX, DHTML/CSS, etc!
Pingback from » Elements of Firefox overhaul arrive for testing IT & Any Solution
Time: March 13, 2010, 7:37 pm
[...] to JaegerMonkey programmer David Mandelin’s description, Mozilla decided to build on the Nitro JavaScript engine for the new [...]
Pingback from Der Motor JavaScript De Firefox wird sich von diesem von Webkit ableiten | Blog auf Software
Time: March 17, 2010, 12:34 pm
[...] | Starting JägerMonkey Weg | [...]
Pingback from Mozilla’s comeback in Javascript performance « Antony Williams' blog
Time: March 18, 2010, 11:08 am
[...] how can Firefox stay relevant?By building JägerMonkey.According to Firefox developers David Mandelin, “The reason we’re [building JägerMonkey] is that TraceMonkey is very fast for code [...]
Pingback from A&B Foundry » Blog Archive » Elements of Firefox overhaul arrive for testing
Time: March 19, 2010, 10:10 pm
[...] to JaegerMonkey programmer David Mandelin’s description, Mozilla decided to build on the Nitro JavaScript engine for the new [...]
Pingback from Austin Kim » Firefox’s Next JavaScript Engine Will Borrow from WebKit [Firefox]
Time: March 22, 2010, 10:34 pm
[...] it’s starting to fall behind its competitors. To up its game, Firefox’s developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done, [...]
Pingback from Enable Firefox Hardware Accelerated Graphics | 48da Tech News
Time: March 24, 2010, 3:03 am
[...] may want to check out the blog post by David Mandelin, which offers specific high-level information on starting the JaegerMonkey [...]
Comment from menstrual cramps
Time: April 17, 2010, 10:55 pm
Thanks mate. Nice info
Pingback from New JavaScript engine of Firefox « GNU/LINUX
Time: April 18, 2010, 1:21 am
[...] improvement They made the new engine enhancements include many aspects. If you are interested, Mandelin The blog article is worth reading. Simply put, only use the J ä gerMonkey Firefox engine will be more [...]
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Time: April 19, 2010, 6:30 pm
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Time: April 21, 2010, 3:22 am
The first change, done by Luke Wagner, was to simplify the stack the interpreter uses to store temporary values and JavaScript stack frames.
Comment from poptropica cheats
Time: April 22, 2010, 2:50 am
JägerMonkey, is an attempt to bring the baseline performance of Firefox up to current standards when the TraceMonkey extension can’t work its magic. Mozilla says the initial performance tests for the new model look promising.
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Time: April 22, 2010, 8:57 am
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Time: April 24, 2010, 7:07 am
Sounds great. I learned something new.
Comment from Gamer
Time: April 28, 2010, 6:37 pm
Tracing will identify hot loops that are worth re-optimizing (the cases where the time spent compiling is actually worthwhile).
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Time: April 29, 2010, 2:34 am
I am really satisfied with this posting that you have given us. This is really a stupendous work done by you. Thank you and looking for more posts
Comment from Annuities
Time: April 29, 2010, 11:10 pm
The secret sauce that will drive Mozilla’s new JavaScript engine engine into the fast lane is some code borrowed from Apple’s WebKit project.
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Time: April 30, 2010, 7:03 am
I learned something new, this is great
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Time: April 30, 2010, 7:12 am
a very nice article. Thanks for sharing it up
Comment from ADT California
Time: May 3, 2010, 10:11 am
I think this change will be great. If anything it will only make it better. I’m sure it will make it much faster also. Thanks for the great article and the information.
Pingback from PHP Developers are switching to Google Chrome | AboutBrowsers.info
Time: May 6, 2010, 1:02 pm
[...] David Mandelin's blog » Starting JägerMonkey [...]
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Time: May 6, 2010, 11:47 pm
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Pingback from Firefox 4: szybszy, przyjaźniejszy i bardziej prywatny! | Blog IT – ittechblog.pl
Time: May 11, 2010, 8:28 am
[...] kodu JavaScript (nowy silnik JägerMonkey), ogólna poprawa wydajności, optymalizacje. Były plany, by skorzystać z silnika JS obecnego w [...]
Comment from kamerali sohbet
Time: May 13, 2010, 12:09 pm
The first change, done by Luke Wagner, was to simplify the stack the interpreter uses to store temporary values and JavaScript stack frames.
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Time: May 14, 2010, 3:11 am
Very informative and trustworthy blog. Please keep updating with great posts like this one.
Comment from crazy taxi
Time: May 14, 2010, 6:31 am
New method JIT compiler for SpiderMonkey is not ideal, but better than many.
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Time: May 15, 2010, 10:58 pm
Great method, i like it .. will try..
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Time: May 15, 2010, 10:58 pm
this metod will try today… thanks..
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Time: May 15, 2010, 10:59 pm
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Time: May 16, 2010, 8:12 pm
The strong competition will prevent you on pages where it should be very effective
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Time: May 20, 2010, 10:25 am
I like your idea on the JIT issue. Good work!
Comment from diaper bag
Time: May 20, 2010, 3:16 pm
Obviously, Mozilla isn’t pleased with the current situation. In most speed tests, current builds of Firefox end up getting trashed by every browser other than Internet Explorer. This has prompted Mozilla to begin work on a new engine called JaegerMonkey.
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Time: May 20, 2010, 4:37 pm
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Time: May 20, 2010, 4:38 pm
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Time: May 21, 2010, 3:07 am
developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done,
Comment from Grafica
Time: May 21, 2010, 10:31 pm
Great article, thanks for sharing.
Comment from bubble shooter
Time: May 22, 2010, 6:47 am
yup, i agree with you that TraceMonkey’s tracing JIT is very fast for code .. i ever used it..
Comment from Background Check
Time: May 22, 2010, 1:31 pm
The new engine JägerMonkey!! I hope to hear more soon. I need more performance – I don’t want to change software.
Comment from Web Hosting Services
Time: May 22, 2010, 4:47 pm
You said that, TraceMonkey’s tracing JIT is very fast for code that it can JIT…i still try to read and learn about your new JagerMonkey Engine.. is it more comfortable rather than VB??
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Time: May 22, 2010, 10:52 pm
It is very fast and very effective.
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Time: May 23, 2010, 2:59 am
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Time: May 23, 2010, 9:29 pm
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Time: May 24, 2010, 12:09 pm
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Time: May 24, 2010, 12:29 pm
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Time: May 24, 2010, 12:32 pm
I think experiments you are trying to do, will be a revolution. Hope you will get the success soon.
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Time: May 24, 2010, 7:17 pm
Hey if it can run sunspider 18% I’m down to beta test it if you need.
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Time: May 24, 2010, 11:21 pm
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Time: May 25, 2010, 2:53 am
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Time: May 25, 2010, 12:26 pm
More Starting JägerMonkey
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Time: May 25, 2010, 12:27 pm
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Time: May 25, 2010, 12:28 pm
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Time: May 26, 2010, 12:46 am
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Time: May 26, 2010, 6:30 am
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Time: May 27, 2010, 5:50 pm
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Time: May 29, 2010, 1:37 pm
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Time: May 29, 2010, 5:56 pm
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Time: May 30, 2010, 9:06 am
Still, it’s an attractive design and we can use it, but it is not the state of the art in the industry
Comment from Master in Finance
Time: May 31, 2010, 1:19 pm
“If can make a lousy slow rendering engine 10% faster than its current speed, it will still remain a lousy slow rendering engine.
Firefox might be lucky for other people creating add-ons, that’s the only reason Firefox is still standing. Mozilla crew are a bunch of noobs.”
Completely agree. 10% is not so much if there is an opportunity to choose a faster engine
Comment from Ninja Games
Time: May 31, 2010, 3:04 pm
Fantastic article, you know your stuff my friend!
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Time: June 1, 2010, 1:18 am
Thanks for this Sir, firefox an all plugin is the best for me, thanks again…
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Time: June 1, 2010, 1:47 am
At this point, everything’s looking good. The next step is to integrate JägerMonkey with tracing, so we can use them complementarily.
Can’t wait to see that happening!
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Time: June 1, 2010, 9:54 am
Very interesting JägerMonkey, congratulations for the article!
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Time: June 1, 2010, 12:09 pm
I am interested in JägerMonkey. good Job…
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Time: June 1, 2010, 12:11 pm
It is good to see and read such a good post on JägerMonkey.
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I am interested in JägerMonkey. good work.
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Time: June 2, 2010, 11:45 pm
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Time: June 3, 2010, 12:04 am
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Time: June 3, 2010, 5:37 am
At this point, everything’s looking good. The next step is to integrate JägerMonkey with tracing, so we can use them complementarily.
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Time: June 3, 2010, 5:38 am
developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done,
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Time: June 3, 2010, 5:44 am
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Time: June 4, 2010, 12:44 am
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Time: June 5, 2010, 4:29 am
Thanks for the code and Hacks article. Link to it was for me very useful.
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Time: June 6, 2010, 12:07 pm
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Time: June 6, 2010, 12:07 pm
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Time: June 6, 2010, 2:09 pm
It is very fast and very effective.
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Time: June 6, 2010, 4:42 pm
JaegerMonkey is not really cool for me. Please check the code site http://hg.mozilla.org/users/danderson_mozilla.com/jaegermonkey/ it is not well design
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Time: June 7, 2010, 1:06 pm
I think that,developers are building a new engine, dubbed JägerMonkey. Ars Technica writes that the new compiler uses some open-source WebKit code to get the job done,
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Time: June 7, 2010, 1:23 pm
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Time: June 8, 2010, 4:27 am
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Time: June 8, 2010, 8:36 pm
some time, i confused with all explanation..
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Time: June 8, 2010, 8:45 pm
all script must be easy to learning. I have learn all about this script and want to know the report.
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Time: June 9, 2010, 1:09 am
It has nothing to do with matching the speed of a statically typed
language. Tracing techniques were originally developed for a statically
typed language: Java.
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Time: June 9, 2010, 4:21 am
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Time: June 9, 2010, 10:21 am
Really appreciate the detailed post. I was having problems with some different JIT comps, but seem to have finally gotten the problems worked out.
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Time: June 9, 2010, 12:50 pm
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Time: June 9, 2010, 9:13 pm
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Time: June 10, 2010, 1:17 pm
Always wanted to know how to start it – very complicated.
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Time: June 10, 2010, 4:57 pm
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Time: June 10, 2010, 7:24 pm
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Time: June 11, 2010, 2:13 am
I think this change will be great. If anything it will only make it better. I’m sure it will make it much faster also. Thanks for the great article and the information
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Time: June 11, 2010, 2:49 pm
The first change, done by Luke Wagner, was to simplify the stack the interpreter uses to store temporary values and JavaScript stack frames.
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Time: June 11, 2010, 5:15 pm
I think this works so well. They did a good job that it works well with firefox.
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Time: June 12, 2010, 4:46 am
amazing indeed
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Time: June 12, 2010, 4:52 am
It is a well executed post. I like the diagram most. It is a helpful informative post. Thanks for sharing this great information.
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Time: June 12, 2010, 5:47 am
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Time: June 13, 2010, 6:34 pm
This is such a great resource that you are providing and you give it away for free. I love seeing websites that understand the value of providing a quality resource for free. It is the old what goes around comes around routine. Did you acquired lots of links and I see lots of track backs??
Comment from submit article
Time: June 14, 2010, 4:07 am
In 6 month You did so much in The JagerMonkey method to speed up on code. Native code you trace as well.
I will bookmark your article for discussion to contiue.
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Time: June 14, 2010, 5:13 am
Thanks this change which will be great. If anything it will only make it better. I’m sure it will make it much faster also. Thanks for the great article and the information
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Time: June 14, 2010, 5:36 am
Jager Monkey is a secure code. And its establishing day by day. Thanks For blessing.
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Time: June 15, 2010, 12:34 am
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Time: June 15, 2010, 1:06 am
I found out that firefox is not really stable nowadays. It would go very slow after I have a few tabs opened and then it would crashed. Does anyone have the same problem??
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Time: June 15, 2010, 1:15 am
Good luck with the JägerMonkey project, I hope it went smoothly and will be made public and we can use it..thanks.
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Time: June 15, 2010, 1:20 am
Thanks on the Hacks Article link which provide more information on the tracing. Thanks you so much for the information which could possible helped complete my project.
Comment from Top 10 Songs
Time: June 15, 2010, 9:58 am
have been noted. Mozilla’s Dave Mandelin like what he sees so far, reporting the “JägerMonkey implements enough JavaScript to run all of SunSpider in [...]
Pingback from 17 Cool Safari 5.0 Features and Tips Revealed | AboutBrowsers.info
Time: June 15, 2010, 4:18 pm
[...] David Mandelin's blog » Starting JägerMonkey [...]
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Time: June 15, 2010, 7:34 pm
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Time: June 15, 2010, 7:36 pm
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Time: June 15, 2010, 7:37 pm
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Time: June 15, 2010, 8:07 pm
Thanks for the report, I was able to check out the how tracing works article on the other page as well. Thanks again.
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Time: June 16, 2010, 12:38 pm
I have read a few articles on tracing. This one goes in debt nicely. Jager monkey not only does the project have a great name it is named after one of my fav drinks.
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Time: June 16, 2010, 12:51 pm
It is a great idea to create the JIT compiler for SpiderMonkey (and Firefox). What a wonderful post.
Comment from komputer
Time: June 16, 2010, 7:00 pm
I agree to this, TraceMonkey is very fast for That code traces, probably with a lot of future things will be a good advantage of internet users.
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Time: June 17, 2010, 1:41 am
the jagermonkey is a very useful tool, plus this article contains very useful information. Tracemonkey is awesome.
Comment from Web Design Company
Time: June 17, 2010, 4:40 am
Hi Luke, I just want to say thanks, JagerMonkey makes our work much easier. Great to find real Firefox fans, thanks for your hard work.
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Time: June 17, 2010, 11:58 am
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Pingback from Mozilla’s comeback in Javascript performance – Antony’s Blog
Time: June 17, 2010, 4:22 pm
[...] how can Firefox stay relevant?By building JägerMonkey.According to Firefox developers David Mandelin, "The reason we're [building JägerMonkey] is that TraceMonkey is very fast for code that traces [...]
Comment from Indonesia Furniture Handicraft Wholesale Marketplace
Time: June 19, 2010, 1:16 am
Thanks for the info this going to be useful for my project…
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Time: June 19, 2010, 1:18 am
Great to find real Firefox fans, thanks for your hard work. I’m going to love this…
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Time: June 19, 2010, 1:19 am
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Time: June 19, 2010, 3:02 pm
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Time: June 20, 2010, 3:41 pm
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Time: June 20, 2010, 8:52 pm
Maybe this is the right way.
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Time: June 20, 2010, 8:53 pm
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Time: June 20, 2010, 8:54 pm
Article is very nicely written and I am happy to find so many useful information here in the post, thanks for sharing it here. I hope you will adding more.
Comment from Car Transportation
Time: June 21, 2010, 7:10 am
I’m ready to switch to JägerMonkey
Comment from veiled chameleon
Time: June 21, 2010, 7:11 am
When is JägerMonkey getting released? Is it stable?
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Time: June 22, 2010, 3:39 am
I was very pleased to find this site.I wanted to thank you for this great read!! I definitely enjoying every little bit of it and I have you bookmarked to check out new stuff you post.
Comment from Insurance Quotes
Time: June 22, 2010, 12:20 pm
Where I can see and download JägerMonkey?
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Time: June 22, 2010, 4:44 pm
Thank you admin
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Time: June 22, 2010, 10:07 pm
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Time: June 22, 2010, 10:08 pm
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Time: June 22, 2010, 11:31 pm
One interesting note is that David created a new function that does abstract interpretation of the bytecode in order to compute stack depths and incoming branch edges.
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Time: June 22, 2010, 11:32 pm
i liked the info..which you presented here..
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Time: June 23, 2010, 12:03 am
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Time: June 23, 2010, 12:42 am
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Time: June 23, 2010, 2:15 am
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Time: June 23, 2010, 3:07 am
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Time: June 23, 2010, 5:00 pm
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Time: June 23, 2010, 6:23 pm
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Time: June 24, 2010, 9:20 am
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Time: June 24, 2010, 7:19 pm
More experience is put into blog but the life style is different.
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Time: June 24, 2010, 7:42 pm
I prefer to read this kind of stuff. The description here is good. Thanks for support me some info about working on JägerMonkey.
Comment from killer sudoku
Time: June 24, 2010, 11:30 pm
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Time: June 25, 2010, 3:07 am
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Time: June 25, 2010, 8:18 am
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Time: June 25, 2010, 8:49 am
Mozilla firefox an all plugin is the best for me, thanks again…
Comment from Cheap Wedding Invitations
Time: June 25, 2010, 5:52 pm
Enjoyed TraceMonkey and now loving JägerMonkey. When will the monkeys get a new friend?
Comment from Wordpress Plugins
Time: June 25, 2010, 6:53 pm
Its really great to know, right now when working on Linux 64bit, @ times I can feel there is a lot of difference in performance in Google Chrome and Mozilla Firefox.
Hope to see that difference as negligible.
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Time: June 26, 2010, 3:42 am
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Time: June 26, 2010, 4:17 am
I just want to say thanks, JagerMonkey makes our work much easier.
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Time: June 26, 2010, 4:44 am
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Time: June 26, 2010, 9:29 pm
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Time: June 26, 2010, 9:47 pm
Well… How big effect of this?
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Time: June 27, 2010, 5:19 am
I did not used it in the past… but, after i read some reviews, I saw that is a nice feature.
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Time: June 27, 2010, 3:30 pm
There are many factors that can prevent the rockets from turning on, so there’s really no short description of the programs that don’t trace. Overall, good report
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Pingback from 5 Exciting Changes Coming to Firefox 4 | Geek Technica
Time: June 28, 2010, 7:20 am
[...] but a long shot.Firefox currently uses nanojit for its native code generator and will be moving to Webkit’s JSCore engine for Firefox 4. Which combined with Tracemonkey’s powerful optimization should give them a better performance [...]
Comment from rainer
Time: June 28, 2010, 9:18 am
interesting, althought i still can’t understand this kind of feature..
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Time: June 28, 2010, 1:36 pm
Its really great to know, right now when working on Linux 64bit, @ times I can feel there is a lot of difference in performance in Google Chrome and Mozilla Firefox.
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Time: June 28, 2010, 11:25 pm
Its really great to know, right now when working on Linux 64bit, @ times I can feel there is a lot of difference in performance in Google Chrome and Mozilla Firefox.
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Time: June 28, 2010, 11:25 pm
I am interested in JägerMonkey. good work
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Time: June 29, 2010, 2:26 am
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Time: June 29, 2010, 4:26 am
You mean to say that Jagger monkey is good compared to Trace monkey using the compiler spider monkey
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Time: June 29, 2010, 4:27 am
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Comment from Whizzinator
Time: June 29, 2010, 11:59 am
You said that, TraceMonkey’s tracing JIT is very fast for code that it can JIT…i still try to read and learn about your new JagerMonkey Engine.. is it more comfortable rather than VB??
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Time: June 29, 2010, 5:16 pm
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Time: June 30, 2010, 5:26 am
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Time: June 30, 2010, 7:49 pm
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Time: July 29, 2010, 1:30 am
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Time: July 29, 2010, 4:00 am
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Comment from link building service
Time: July 29, 2010, 9:22 am
We were pleasantly surprised to find that the stack rearrangement alone gave a 3-5% speedup, both in the interpreter and JägerMonkey.
Comment from hearing school
Time: July 29, 2010, 9:23 am
officially crossed TraceMonkey on the v8 suite of benchmarks. Yay! It’s not by a lot, but this gap will continue …
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Time: July 29, 2010, 12:54 pm
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Time: July 29, 2010, 2:07 pm
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Comment from Car Accident Solicitor
Time: July 29, 2010, 4:49 pm
The basic definition of JägerMonkey is this; JagerMonkey is an upgrade to the Spidermonkey Javascript engine for the Firefox browser. It is currently under development by the Mozilla Corporation. It is expected to fix certain problems not addressed by the previous Tracemonkey engine. The core codebase is from Webkit
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Time: July 29, 2010, 7:32 pm
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Time: July 30, 2010, 2:11 am
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Time: July 30, 2010, 3:56 am
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