[Webkit-unassigned] [Bug 156147] [JSC] implement async functions proposal

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156147

--- Comment #103 from Saam Barati <sbarati at apple.com> ---
(In reply to comment #97)
> The dromaeo results for the latest patch are about 3-4% regressions for each
> test. With the branch prediction adjustment, there's a 5-10% improvement (If
> there's a command to dump results of run-perf-tests as text, I'll provide
> all the numbers).
> 
> With the command `run-jsc-benchmarks --outer 10 --octane --benchmark
> "closure|jquery" baseline:~/git/WebKit2/WebKitBuild/Release/DumpRenderTree
> asyncawait:~/git/WebKit/WebKitBuild/Release/DumpRenderTree`, results are:
> 
>                          baseline                 asyncawait                
> 
> 
> closure              0.30989+-0.00551          0.30340+-0.00295        
> might be 1.0214x faster
> jquery               3.65550+-0.01427    !     3.78112+-0.03262       !
> definitely 1.0344x slower
> 
> <geometric>          1.06425+-0.01004    ?     1.07103+-0.00613       ?
> might be 1.0064x slower
> ---
> 
> The jquery results might look a little worse than previously described, but
> the fact that Dromaeo consistently does so much better with the branch
> predictions added goes a long way in my opinion.
> 
> Ensuring that `m_runtimeFlags` is packed efficiently and accessed in cache
> more often will probably see some improvement, but hard to guess how much
Are these the performance results of the patch that was just landed?
Or is this the performance if we actually have the feature enabled?

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