[Webkit-unassigned] [Bug 70995] The GC should be parallel

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=70995





--- Comment #1 from Filip Pizlo <fpizlo at apple.com>  2011-10-27 00:41:51 PST ---
Created an attachment (id=112647)
 --> (https://bugs.webkit.org/attachment.cgi?id=112647&action=review)
work in progress

This works, and produces speed-ups, but still needs clean-ups.  Here's the performance using my harness tuned to measure GC behavior.


Benchmark report for V8.

VMs tested:
"TipOfTree" at /Volumes/Data/pizlo/quinary/OpenSource/WebKitBuild/Release/jsc
"ParallelGC" at /Volumes/Data/pizlo/senary/OpenSource/WebKitBuild/Release/jsc

Collected 8 samples per benchmark/VM, with 4 VM invocations per benchmark. Ran 5 benchmark
iterations, and measured the total time of those iterations, for each sample. Emitted a call
to gc() between sample measurements. Used 5 benchmark iteration per VM invocation for
warm-up. Used the jsc-specific preciseTime() function to get microsecond-level timing.
Reporting benchmark execution times with 95% confidence intervals in milliseconds.

                       TipOfTree               ParallelGC                                   

crypto             369.6983+-2.7221    ?   370.0403+-1.5868       ?
deltablue          903.7007+-8.3329    ?   911.5094+-5.1716       ?
earley-boyer       462.6758+-1.3969        461.6687+-1.3534       
raytrace           315.5462+-1.9768    ?   318.6208+-1.9752       ?
regexp             549.5400+-4.7576    ^   541.9117+-1.7295       ^ definitely 1.0141x faster
richards           632.6940+-2.0461    ?   634.8623+-2.2790       ?
splay              414.3850+-2.1458    ^   325.4297+-17.9843      ^ definitely 1.2733x faster

<arithmetic>       521.1771+-1.3120    ^   509.1490+-2.7390       ^ definitely 1.0236x faster
<geometric> *      492.4826+-1.0591    ^   476.1071+-3.8258       ^ definitely 1.0344x faster
<harmonic>         468.0389+-1.1209    ^   448.5087+-4.9235       ^ definitely 1.0435x faster

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