experiment does not provide any actionable data.
Knowing that checks introduce X% overhead is kinda useless - unless you
also know an algorithm to eliminate all of them and retain correctness.
Vyacheslav Egorov
On Wed, Nov 5, 2014 at 5:37 PM, Gabriel Southern
wrote:
> Perhaps it would help if I
, and those are correct.
Vyacheslav Egorov
On Tue, Oct 14, 2014 at 9:46 PM, Gabriel Southern
wrote:
> I wanted to try IRHydra2 (http://mrale.ph/irhydra/2/) with the Octane
> benchmarks. When I use the x64.debug version of d8 with the flags listed
> for IRHydra2 and run the Octane ben
for example Slides 38 on show HIR,
not disassembly)
Also if you --trace-hydrogen you can use a tool of mine called IRHydra[1]
to inspect optimized code. It can show you source, HIR & disassembly all
together[2].
[1] http://mrale.ph/irhydra/2
[2] http://imgur.com/HbOOXEM
Vyacheslav Egorov
start.
Take for example a look at: http://jsperf.com/join-faster-than-concat
Vyacheslav Egorov
On Tue, Sep 2, 2014 at 12:59 AM, Isiah Meadows wrote:
> On Mon, Sep 1, 2014 at 9:12 AM, Vyacheslav Egorov
> wrote:
> >> Array#[push|pop]() is easily optimized for array instances,
);
for (auto& s : array) str.append(s);
return str;
}
which is btw exactly what _FastAsciiArrayJoin attempts to do.
Vyacheslav Egorov
On Mon, Sep 1, 2014 at 11:20 AM, Isiah Meadows wrote:
> That library rarely does type checking. This contributes a lot of
> speed to their o
olate.*
This requirement is not checked right now, but neither anything is
guaranteed to work if you try and start executing JavaScript in the
interrupted isolate from the callback or from another thread (by unlocking
isolate in the callback and allowing other thread to lock it).
Vyacheslav Egorov
42..self;"
"v + ' is a ' + typeof v")->Equals(v8_str("42 is a
number")));
}
Vyacheslav Egorov
On Wed, May 14, 2014 at 10:19 AM, Sven Panne wrote:
> On Tue, May 13, 2014 at 11:15 PM, Ben Noordhuis wrote:
>
>> Yang, isn't t
slow for various reasons).
Can we proactively avoid falling down the same hole with ES6 features?
What about having ES6 features (micro)benchmark suite to drive performance
of this features across all browsers implementing them?
Vyacheslav Egorov
On Tue, May 6, 2014 at 9:22 PM, 'Erik Arvid
}
return wrapSource(source, url, listenerName);
}
return preprocessor;
})();
Vyacheslav Egorov
On Thu, Dec 5, 2013 at 12:04 AM, wrote:
> Let me start with a request for patience, I have a complex problem and I'm
> unsure on some of the V8 terminology.
>
>
taking a look at his code.
Vyacheslav Egorov
On Fri, Oct 4, 2013 at 7:27 PM, Yusuke SUZUKI wrote:
> We're currently working on adding a threading API, probably similar to
>> blink's WebThread.
>
>
> Sounds very nice. Providing embedder-side's threading operation
Do you report the size of your enormous Judy array to v8 via
AdjustAmountOfExternallyAllocatedMemory? If you do try disabling that.
Vyacheslav Egorov
On Jun 6, 2013 10:22 AM, "Hitesh Gupta" wrote:
> Hi,
> We are facing a similar problem. We have an XMPP server running ove
te amount of time]
Vyacheslav Egorov
On Sat, Apr 27, 2013 at 10:36 AM, Dmitry Azaraev
wrote:
> > Boolean values are eternal --- they never die. Small integers (31 bits
> on ia32 and 32bits on x64) are
> > not even allocated in the heap, they are *values* essentially so weak
> re
is undefined for them.
> it is safe return persistent handle via raw return handle; instead of
return handle_scope.Close(handle); ?
Yes. You need to use Close only for Local handles. If you return Persistent
handle you can just return that directly.
--
Vyacheslav Egorov
On Fri, Apr 26, 2013 at 12
y state to figure out what is going on.
So unless you have deep understanding of V8 internals and proficient in
reading assembly language this flag is useless.
Vyacheslav Egorov
On Mon, Mar 18, 2013 at 5:19 PM, Nick Evans wrote:
> I would like to use the --trap_on_deopt flag ("put a
Andy,
Lack of deforestation is not really *the* main issue in this particular
example.
If you try fastMap that I attached then you'll see that its overhead is at
least 80% less.
Vyacheslav Egorov
On Mon, Feb 4, 2013 at 7:02 PM, Andrii Melnykov wrote:
>
> On Monday, February 4, 2
code.google.com/p/v8/issues/detail?id=2206).
An alternative approach could provide specializations of map for various
backing storage types. But again, there is no plumbing in V8 to enable that.
Vyacheslav Egorov
On Mon, Feb 4, 2013 at 4:17 PM, Andreas Rossberg wrote:
> Moreover, 'ma
It should work.
Please post the a complete reproduction of the problem that can be
compiled: example above should not compile because Set expects a handle not
a raw number.
Vyacheslav Egorov
On Fri, Dec 7, 2012 at 3:24 PM, Paul Harris wrote:
> Hi,
>
> How do I do the equivalent of
:
chrome.exe --no-sandbox --js-flags="--trace-opt --trace-deopt" > log.txt
Vyacheslav Egorov
On Thu, Nov 8, 2012 at 4:48 AM, Kevin Gadd wrote:
> Interesting, I wonder why --trace-deopt isn't spitting out deopt notices for
> me. Maybe some of the output is being lost bec
caleF]
I do not see such deopt on Chrome 23 (though I did see some deopts of
this function). This indeed looks like an issue either with type
feedback or with generated code, though I can't be sure.
Sven recently was changing things in that neighborhood. I am CCing
him. I hope he will be able to
and you pass
point that contains strings in x and y then function add will
deoptimize. But this will happen when you execute add not when you
create point with string values in x and y.
Vyacheslav Egorov
On Tue, Nov 6, 2012 at 3:44 PM, Wyatt wrote:
> Interesting! But wouldn't each of the
The answer is no for each case.
V8 does not track types of values assigned to a named properties.
Vyacheslav Egorov
On Tue, Nov 6, 2012 at 12:27 PM, Wyatt wrote:
> With the follow code one hidden class is created:
>
> function Point(x, y) {
> this.x = x;
> this.y =
Hi Kevin,
Does it deoptimize?
I do not see any deoptimizations in the log you have attached, were
you running with --trace-deopt?
Vyacheslav Egorov
On Tue, Nov 6, 2012 at 12:33 AM, Kevin Gadd wrote:
> Hi,
>
> I've been looking into some performance issues in Chrome Canary for
Depends on the operating system you are running in.
Check out man backtrace if you are on Mac/Linux/BSD like OS.
Vyacheslav Egorov
On Mon, Nov 5, 2012 at 8:17 AM, Joran Greef wrote:
> How can I get such a back trace?
>
> On 05 Nov 2012, at 6:14 PM, v8-users@googlegroups.com wrote:
can somehow get a back trace from inside
CollectAllAvailableGarbage.
--
Vyacheslav Egorov
On Mon, Nov 5, 2012 at 7:08 AM, Joran Dirk Greef wrote:
> In practice it's working perfectly now. I rolled Node from v0.8 back to v0.6
> and the false positive allocation errors are no longe
ou hit a full collection it will always pause your
app for much longer then a incremental collector of 3.7 and later
would (given that everything is tweaked correctly).
--
Vyacheslav Egorov
On Mon, Nov 5, 2012 at 1:28 AM, Joran Dirk Greef wrote:
> Recent GC changes in V8 are wreaking hav
currently no way to configure
GC like that.
Vyacheslav Egorov
On Mon, Nov 5, 2012 at 12:50 AM, Joran Dirk Greef wrote:
> Max-old-space-size is measured in MB not KB as you suggest.
>
> Further, max-new-space-size makes no difference to the GC trace given above,
> whether it's passed
> Please make sure you have depot_tools in your $PATH.
http://dev.chromium.org/developers/how-tos/install-depot-tools
--
Vyacheslav Egorov
On Wed, Oct 24, 2012 at 11:05 PM, Joe Millenbach wrote:
> I'm trying to follow the directions on the build page to both build
> and test my
explained in my
previous mail.
Anyway all this matters only on a very hot path.
Vyacheslav Egorov
On Oct 21, 2012 7:10 PM, "idleman" wrote:
> Thanks for your answer!
>
> To make the question some more clear, I invoke huge number of asynchronous
> functions, but sometimes I
definitely save space.
--
Vyacheslav Egorov
On Oct 20, 2012 10:05 PM, "idleman" wrote:
> Hi,
>
> Is empty functions in lined whenever the function is know? Example:
>
> function do_nothing() { }
>
> //somewhere later in the code:
> var cb = do_nothing;
>
No this is not possible. No matter what they write in the source 5 or 5.0
it'll be represented as 5.
Vyacheslav Egorov
On Oct 16, 2012 9:31 PM, "Brandon Harvey" wrote:
> I'd like to be able to do printf / snprintf style string formatting, on
> the C++ side, usin
There are no integers in JavaScript so semantically they are identical.
It's an implementation detail that 5.0 is sometimes represented as 5. Why
do you want to distinguish them?
Vyacheslav Egorov
On Oct 16, 2012 5:25 AM, "Brandon Harvey" wrote:
> I'd like to be abl
ode and go read assembly around deopt point.
> does that mean i should replace the for in with a for loop that iterates
> over Object.keys?
Yes.
--
Vyacheslav Egorov
On Thu, Oct 11, 2012 at 11:48 AM, Christoph Sturm
wrote:
> I'm trying to optimize my node app with --trace-deopt
Chromium's bindings layer uses External to associate opaque data with
V8 objects and callbacks (see methods accepting Handle data in
V8 api).
So making External into a non-Value might involve some bindings work.
--
Vyacheslav Egorov
On Fri, Sep 7, 2012 at 2:50 PM, Sven Panne wrote:
&g
Minor correction: I obviously meant to say "way below" not "way beyond".
Vyacheslav Egorov
On Aug 21, 2012 8:03 AM, "Joran Greef" wrote:
> Thank you Vyacheslav
>
> On 20 Aug 2012, at 8:41 PM, v8-users@googlegroups.com wrote:
>
> > I would say l
I would say limit is around 2^24 entries (biggest fixed array can have
approx 2^27 entries and hash table requires 3 entries per key-value pair
and tries to maintain 50% occupancy). But overheads for mutating such a
table become less than reasonable way beyond this point.
Vyacheslav Egorov
On
=332
This keeps them alive as long as wrapper is alive.
--
Vyacheslav Egorov
On Aug 20, 2012 6:04 PM, "Morten Olsen" wrote:
> Hi,
>
> I'm struggling to figure out precisely what/where keeps an anonymous
> function alive when used as an event h
than supporting
register pairs across the pipeline.
--
Vyacheslav Egorov
On Mon, Aug 13, 2012 at 11:34 AM, Vyacheslav Egorov
wrote:
> Are you planning to allocate a couple of general purpose registers to
> represent a double? Do these registers have to be ordered? (e.g. do
> you need r_{N
In any case it would require some adjustments in allocator to get
"what interferes with what" right.
--
Vyacheslav Egorov
On Mon, Aug 13, 2012 at 7:53 AM, Evgeny Baskakov
wrote:
> Hi guys,
>
> I'm looking for ways to modify the Crankshaft compilation mode to make it
> wo
There is no such flag now. Sorry.
--
Vyacheslav Egorov
On Tue, Jul 31, 2012 at 6:56 PM, Sławek Janecki wrote:
> Anyone? Is there a flag in new V8 that tells me, why my function wont be
> optimized?
> In previous V8 versions optimizer will try to optimize and bailout when
> nesseser
discussions about including 64bit
types into ES6 as part of Binary Data work (e.g.
http://wiki.ecmascript.org/doku.php?id=harmony:binary_data_discussion
). I don't know what is the status of this now. Any standardization
issues should be addressed to TC-39.
--
Vyacheslav Egorov
On Fri, Jul 27, 2012 at
You need to use something that gives you access to heap snapshots. I think
node-inspector does. But better ask at node.js list.
Vyacheslav Egorov
On Jul 25, 2012 11:15 PM, "spollack" wrote:
> I think you are probably right. after more testing, i can see that the GC
> is runnin
the memory because writing stuff to
network/disk does not keep up with incomming data etc).
I don't think any GC tweaks will be helpful here.
--
Vyacheslav Egorov
On Tue, Jul 24, 2012 at 9:52 PM, spollack wrote:
> here is a reading even closer to the peak:
> {"rss":542273536,
would be
accepted or not without actually seeing a patch.
--
Vyacheslav Egorov
On Wed, Jul 25, 2012 at 4:20 PM, Evan Wallace wrote:
> Oh ok, that makes sense. So V8 generates an integer instruction only if the
> remainder is always zero. I've submitted this as issue 2258.
>
&g
What is V8 heap usage: heapTotal and heapUsed parts reported by
process.memoryUsage?
--
Vyacheslav Egorov
On Tue, Jul 24, 2012 at 8:52 PM, spollack wrote:
> I am running a nodejs app in heroku, and on certain datasets i'm going over
> the heroku memory limit of 512MB. I'm run
Once type-feedback told hydrogen that division happened to produce
double value it does not try to revert it to integer division.
The only exception is (quite fragile) MathFloorOfDiv optimization
performed by HUnaryMathOperation::Canonicalize.
Consider contributing your patch :-)
--
Vyacheslav
Yes.
--
Vyacheslav Egorov
On Mon, Jul 23, 2012 at 4:48 PM, Sebastian Ferreyra Pons
wrote:
>> Yes. In a constructor function, the hidden class begins with an
>> element that also includes a prototype. In two different constructor
>> functions these initial elements will be
inheritance languages (at least Oberon
compilers used in back in 80s).
--
Vyacheslav Egorov
On Fri, Jul 20, 2012 at 12:41 AM, jMerliN wrote:
>> This will be great but there is no easy way to check that two hidden
>> classes are compatible. Hidden classes are currently compared by
>&g
. This is much more
complex and I am not sure it benefits any real world code.
--
Vyacheslav Egorov
On Jul 19, 8:03 pm, jMerliN wrote:
> Vyacheslav,
>
> When I run the code you posted, I see a much bigger discrepancy
> between test/test2 in the first pass and a slight reduction in test's
&g
The major difference between 3.0 and those before it is Crankshaft ---
adaptive compilation pipeline:
http://blog.chromium.org/2010/12/new-crankshaft-for-v8.html
I am not sure what was the major difference between 2.x and 1.x
--
Vyacheslav Egorov
On Thu, Jul 19, 2012 at 5:07 PM, W Brimley
ement is purely time
spent in optimized code. If you call the same code second time you see
purely timing results for optimized code. This is why benchmarks
should always contain warm up phase to let optimizing JIT kick in.
Hope this explains it.
--
Vyacheslav Egorov
On Thu, Jul 19, 2012 at 3:
a normal function with .prototype; they
are just not linked together with a transition and are completely
separated. I am not exactly sure why.
Functions coming from different contexts (iframes) will have different
hidden classes.
Strict functions ("use strict";) will have different hi
ove.
> Your explanation on why the no-message deopts occur is helpful
To be precise I was referring to deoptimization that happens on
"deoptimize" instruction you quoted in your first mail.
[please do not hesitate to ask more questions!]
--
Vyacheslav Egorov
On Wed, Jul 18, 2012 at 6:
parate files (I do it
with a small script) or minimized by applying --hydrogen-filter=foo
flag to block optimization of all functions that are not called foo.
--
Vyacheslav Egorov
On Jul 18, 12:42 am, Kevin Gadd wrote:
> Thanks for the link to that video, I'll give it a look. Based on
ments]
--
Vyacheslav Egorov
On Wed, Jul 11, 2012 at 5:02 PM, Michael Schwartz wrote:
> Here's a pattern, using Canvas as an example:
>
> function foo() {
> var c = new Canvas();
> var ctx = c.getContext('2d');
> var grad = ctx.createLinearGradient(0,0
emory management (e.g. reference counting
based scheme) in pure JS (but it will be error prone).
That said if you are doing server side JS you can easily expose
MakeWeak to your code. Some node.js modules do that.
--
Vyacheslav Egorov
On Tue, Jul 10, 2012 at 3:33 PM, mschwartz wrote:
> I was read
This is not a V8 crash, the crash is in the WebKit. Please report it to them.
--
Vyacheslav Egorov
On Tue, Jul 10, 2012 at 2:16 PM, Manjunath G wrote:
> Hi,
>
> When I try to test the HTML5 feature drag drop from
> http://html5demos.com/drag,
> v8 is crashing. Looks like crash
call is on a very hot path.
Vyacheslav Egorov
On Jul 10, 2012 9:19 AM, "Jakob Kummerow" wrote:
> On Tue, Jul 10, 2012 at 7:58 AM, Rohit wrote:
>
>> Does V8's strict mode implementation offer any performance benefits?
>>
>
> No.
>
>
> --
> v8-us
ll it's a huge
engineering problem as it requires audit and refactoring of 4 years of
code written in "no OOM or crash" paradigm.
--
Vyacheslav Egorov
On Thu, Jun 28, 2012 at 12:53 AM, Brian Wilson wrote:
> Thanks,
>
> I've started by setting a breakpoint in
> v8:
ntext before a call to
* DetachGlobal.
*/
void ReattachGlobal(Handle global_object);
Unfortunately it seems that your use case is not supported by V8's API.
--
Vyacheslav Egorov
On Wed, Jun 27, 2012 at 3:58 PM, MikeM wrote:
>
> > There is no way. New context mean
t V8 might start handle OOMs more gracefully in some day
in the future (which is not trivial as OOM might leave VM in
inconsistent state).
--
Vyacheslav Egorov
On Wed, Jun 27, 2012 at 11:55 PM, Brian Wilson wrote:
>
> I've been running into some issues lately where I see the mes
return new foo();
}
var o1 = mkfoo();
var o2 = mkfoo();
o1 instanceof o2.constructor // => false
--
Vyacheslav Egorov
On Tue, Jun 26, 2012 at 5:34 PM, MikeM wrote:
>> Array function in one context is different from Array function in
>> another context as each context is a se
Array function in one context is different from Array function in
another context as each context is a separate world with it's own
built-in objects.
You can use Array.isArray which should work cross-context.
--
Vyacheslav Egorov
On Mon, Jun 25, 2012 at 9:08 PM, MikeM wrote:
> The co
This assertion indeed indicates that your are trying to use V8 from a
thread that does not own an isolate.
You should get exclusive access to the isolate you are going to use with Locker:
https://github.com/v8/v8/blob/master/include/v8.h#L3638
--
Vyacheslav Egorov
On Fri, Jun 15, 2012 at 1:16
compiler and to a person reading my code).
--
Vyacheslav Egorov
On Sat, Jun 16, 2012 at 5:44 PM, Pablo Sole wrote:
> Hello there,
>
> I'm embedding v8 into a binary instrumentation framework and I'm trying
> to use an ArrayBuffer/TypedBuffer for fast memory operations (
Hello,
Please link against debug version of V8 to get more information about the crash.
Also ensure that the thread that invokes your even_handler owns V8
Isolate if you have multiple threads using V8 concurrently.
--
Vyacheslav Egorov
On Fri, Jun 15, 2012 at 8:28 AM, Serega wrote:
> Hel
Actually CCing Michael and Andreas.
--
Vyacheslav Egorov
On Fri, Jun 8, 2012 at 10:49 PM, Vyacheslav Egorov wrote:
> +mstarzinger +rossberg
>
> I think we need a repro and V8 version. I could not repro on ToT with
> an example like:
>
> static Handle Getter(Local property,
perty]] (Object.defineProperty) but
there is some special handling in our code that prevents it.
https://github.com/v8/v8/blob/master/src/runtime.cc#L4459-4478
--
Vyacheslav Egorov
On Fri, Jun 8, 2012 at 9:33 PM, Erik Arvidsson wrote:
> The V8 WebKit bindings generates something like this
uint32 via >>> 0, I get to 36ms
(0.00036ms per key).
Limiting number of bits inside the table does not improve anything
(which is quite expected with code shaped like that).
--
Vyacheslav Egorov
On Wed, May 30, 2012 at 7:10 PM, Joran Greef wrote:
> Keeping everything as Int32 but c
mask =
number_of_buckets - 1 (and number_of_buckets is a power of 2).
--
Vyacheslav Egorov
On Wed, May 30, 2012 at 7:02 PM, Joran Greef wrote:
> To clarify, Array instead of Uint32Array is slightly slower as expected:
> 0.54ms per key vs 0.48ms per key.
>
> --
> v8-users mail
rts input via ToInt32) so the
result is always a number from unsigned 32-bit integer range.
See: http://es5.github.com/#x11.7.3
x >>> 0 is basically ToUint32(x)
--
Vyacheslav Egorov
On Wed, May 30, 2012 at 6:34 PM, Stephan Beal wrote:
> On Wed, May 30, 2012 at 6:25 PM, Vyacheslav Eg
array: new
Int32Array(256); [not necessary if you are running x64 version of V8]
c) stop doing >>> 0 at the end;
--
Vyacheslav Egorov
On Wed, May 30, 2012 at 5:21 PM, Joran Greef wrote:
> The difference comes through when changing "integer % Math.pow(2,32)"
> to "
int32 (another example
of this bug: http://code.google.com/p/v8/issues/detail?id=2097).
I suggest you post your code here if possible so that we could take a look.
--
Vyacheslav Egorov
On Wed, May 30, 2012 at 4:40 PM, Jakob Kummerow wrote:
> As long as you're running unoptimized code o
Paul, I wonder if you have some reference MIPS numbers to share? Do
the numbers you match Lawrence's?
Lawrence, I wonder what numbers you are aiming for? What numbers did
you see with your other JavaScript engine?
--
Vyacheslav Egorov
On Wed, May 30, 2012 at 12:00 PM, Lawrence wrote:
V8 does not support read only external arrays.
--
Vyacheslav Egorov
On Mon, Apr 23, 2012 at 7:49 AM, Paul Harris wrote:
> Any more information on this?
>
> I would like make TypeArray access read-only too.
>
>
> On Tuesday, May 10, 2011 8:04:17 AM UTC+8, Henrik Lindqvist w
Locally scoped version of persistent is almost equivalent to Local
except that Local can never be weak.
> Local lcontext = pcontext;
It should be
Local lcontext = Local::New(pcontext);
--
Vyacheslav Egorov
On Fri, Apr 6, 2012 at 3:32 AM, Marcel Laverdet wrote:
> Hey I'm wonderin
operator* defined on a v8::Handle does not return a pointer to an
object but rather a pointer to place which contains that pointer.
Why do you actually want to get a raw pointer to an object?
--
Vyacheslav Egorov
On Wed, Mar 14, 2012 at 1:44 PM, avasilev wrote:
> Seems this approach will l
property names).
You have to enclose top level expression like that in parenthesis if
you want to ensure that it is parsed as an expression.
--
Vyacheslav Egorov
On Mon, Mar 5, 2012 at 1:02 PM, fdmanana wrote:
> Hi,
>
> When trying to evaluate the following object expression in the shell
Here is an alternative (a bit more precise) test case:
http://jsperf.com/float64-vs-float/2
--
Vyacheslav Egorov
On Tue, Jan 17, 2012 at 10:46 AM, Daniel Clifford wrote:
> All the examples are optimized by Crankshaft. However, in the Float64Array
> case, storing the intermediate values
are values and they can be
shared:
a.x = 1 / n; // a.x will contain pointer to the boxed number (HeapNumber)
a.y = a.x; // a.y points to the same HeapNumber as a.x.
--
Vyacheslav Egorov
On Fri, Dec 30, 2011 at 5:41 AM, Joseph Gentle wrote:
> Cool, thanks. I tracked down the deoptim
at contain floating point values.
This currently requires boxing (and boxing requires heap allocation, heap
allocation puts pressure on GC etc). I wonder if you can put typed arrays
(e.g. Float64Array) to work here.
--
Vyacheslav Egorov
On Thu, Dec 29, 2011 at 4:18 AM, Joseph Gentle wrote:
&g
-opt --trace-bailout --trace-deopt output to figure
out what optimizer does with those function.
--
Vyacheslav Egorov
On Mon, Dec 26, 2011 at 7:00 AM, Joseph Gentle wrote:
> What does it mean when I see BinaryOpStub_MUL_Alloc_HeapNumbers in my
> profile? Does that mean the compiler is p
Your weak callback (handle_weak) is empty and does not follow the contract.
Put object.Dispose(); there.
--
Vyacheslav Egorov
On Mon, Dec 26, 2011 at 12:55 PM, D C wrote:
> Hi:
> Thanks for you replay, I modify my source according to your words,
> It seems not work.
> here
Every weak callback should either revive (via ClearWeak or MakeWeak) or
destroy (via Dispose) the handle for which it was called. This contract is
described in v8.h, see the comment above WeakReferenceCallback definition.
You have a callback that does not follow this contract.
--
Vyacheslav
). Optimizer will try to
deal with polymorphism by inlining (limited amount) of polymorphic cases.
--
Vyacheslav Egorov
On Sat, Dec 17, 2011 at 8:51 PM, Marcel Laverdet wrote:
> I only have a loose understanding of v8's hidden classes and optimizer,
> but there's something I've
faster.
However it cannot replace hidden classes entirely as noted above.
--
Vyacheslav Egorov
On Sat, Dec 17, 2011 at 11:31 AM, Vladimir Nesterovsky <
vladi...@nesterovsky-bros.com> wrote:
> Yesterday I've seen an article about some design principles of V8
> JavaSc
nsure that this function is optimized? If it is
frequently called and it takes non-trivial amount of time to execute --- it
will be optimized.
--
Vyacheslav Egorov
On Fri, Dec 16, 2011 at 9:11 PM, Egor Egorov wrote:
>
> Yes but how many calls do I have to fire till this optimisation takes
&
will call it with numbers only V8 will in the end generate code
that is specialized appropriately for the number case.
--
Vyacheslav Egorov
On Fri, Dec 16, 2011 at 12:23 PM, Egor Egorov wrote:
> Let's suppose I have a function that expects an argument of a certain
> type, a number.
> Would this be a valuable bug report as is?
Yes, please file a bug with a repro so we can start looking.
--
Vyacheslav Egorov
On Wed, Oct 12, 2011 at 2:25 AM, Marcel Laverdet wrote:
> I've managed to simplify the repro case a lot, removing the dependency on
> NodeJS and other
Marcel,
It's really hard to say anything without reproduction. It might be a
genuine bug in the deoptimizer.
--
Vyacheslav Egorov
On Tue, Oct 11, 2011 at 9:53 PM, Marcel Laverdet wrote:
> Hey there I'm trying to track down an issue with my v8 application (on
> NodeJS). This
You have to use Isolate::Enter or Isolate::Scope.
If you want to use the default isolate just acquire isolate lock with
Locker.
v8.h includes very detailed comments. Please read them for further
information:
http://code.google.com/p/v8/source/browse/trunk/include/v8.h#3510
--
Vyacheslav Egorov
You can not declare handle scope in a thread that does not yet own V8
Isolate. You should enter an Isolate first.
--
Vyacheslav Egorov
On Mon, Oct 10, 2011 at 1:02 PM, Adrian wrote:
> Hi,
>
> This is the exact, complete program, that is failing..
>
> class TestThread : public
:Exit so your stacks of entered/saved contexts grow without
bounds.
Please check that they are balanced. You can also add some debug
prints into Context::Enter to see length of entered_contexts_ stack.
--
Vyacheslav Egorov
On Fri, Sep 2, 2011 at 4:09 PM, Stuart wrote:
> The system is still
> Would it produce weak references? I think not, right?
No. When I am talking about weak references I mean v8 API Handles that
were made weak with MakeWeak method.
--
Vyacheslav Egorov
On Thu, Sep 1, 2011 at 11:09 PM, Dennis H wrote:
> Hi Vyacheslav,
>
> I guess you are right
you seem to allocate for each task.
--
Vyacheslav Egorov
On Thu, Sep 1, 2011 at 8:34 PM, Dennis H wrote:
> Hi Vyacheslav,
>
> I see your point.
>
> I don't use separate Isolate for each thread and all tasks use
> function objects compiled in the global Context/Isolate.
&g
rintF("FreeUnmarkedObjects took %d ms\n"
+ "%d bytes in %d objects alive, %d bytes in %d objects freed\n",
+ static_cast(end - start),
+ alivebytes,
+ alive,
+ freedbytes,
+ freed);
}
--
Vyacheslav Egorov, Software Engi
stack check in the prologue. But if print is an API
function then this loop will have no interruption point which is bad.
--
Vyacheslav Egorov
On Wed, Aug 31, 2011 at 10:39 PM, Kyle Morgan wrote:
> Hi Vyacheslav,
>
> Allow me to demonstrate what I mean. I ran the v8 shell with code
&
s are important part of V8's interruption mechanism so both
compilers emit them to make all loops interruptable.
[1] http://code.google.com/p/v8/source/browse/trunk/src/hydrogen.cc#2823
[2] http://code.google.com/p/v8/source/browse/trunk/src/hydrogen.cc#1247
--
Vyacheslav Egorov
On Wed, Aug 31,
in parallel on V8 unless you create
several isolates.
If you are using a single isolate from many threads you have to ensure
that only one thread is executing JS at the given moment.
--
Vyacheslav Egorov
On Wed, Aug 31, 2011 at 2:28 AM, Dennis H wrote:
> Dear v8 Developers,
>
> I am r
his will lead to fragmentation but is much more stable then
disabling full collection entirely.
--
Vyacheslav Egorov
On Tue, Aug 30, 2011 at 6:52 PM, Chris Jimison wrote:
> Hi Vyacheslav,
>
> Sorry I took so long to get back to this.
>
>> What version were you using before u
Hi,
Main issue here is that V8 does not have a PPC codegen.
You'll to implement one (plus all required arch specific runtime
support) if you want to see V8 running on Power PC.
--
Vyacheslav Egorov
On Fri, Aug 26, 2011 at 4:06 PM, swsyessws wrote:
> Hello all, I am a new user of
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