Hello all,
Sorry my intromission, but this thread interests me.
A couple of weeks ago I posted a problem which this thread now answered
me: why my app wasn't working in a 64 bit Windows box (lots of JavaScript).
First, thank you for providing these information. Worst then make code
that doesn't work is not know why :)
A little of topic, but does anyone knows how I can, then, compile Qt
(I'm using 4.8.4), webkit+v8, so I can work in 32/64 bits Windows envs?
I mean, if it's possible.
Sorry for my english.
Thank you very much,
Richard.
On 02/19/2013 02:06 PM, Osztrogonác Csaba wrote:
Hi,
Jocelyn, have you tried to enable DFG JIT and/or
LLINT on Windows? Both of them can speedup JSC.
But I have no idea how MSVC friendly the LLINT asm is ...
On my Linux box I got the following numbers a week before for SunSpider:
- interpreter (LLINT C-loop): 836 ms
- LLINT (asm): 480 ms
- JIT: 305 ms
- LLINT + JIT: 193 ms
- LLINT + JIT + DFG-JIT: 140 ms
Ossy
Jocelyn Turcotte írta:
Hi Stan,
Chrome uses V8, while other ports of WebKit, including Qt, use
JavaScriptCore (Qt only uses V8 for QML).
JavaScriptCore has similar performance to V8 on Mac after Apple
implemented what they call DFG JIT.
On Windows 32bit it still has basic JIT.
On Windows 64bit it lags way behind, where it's still using the
interpreter.
This patch brings basic JIT support for Windows x64 and should be
released with Qt 5.1: https://bugs.webkit.org/show_bug.cgi?id=107965
This should be 2x-4x times faster than the interpreter according to
my quick tests.
But this still doesn't add support for DFG JIT, still only available
on Mac and Linux, which would bring JS performances closer to Chrome's.
So yes sadly I think that this kind of performance is currently
expected on Windows x64 with Qt 5.0.
Cheers,
Jocelyn
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