[Webkit-unassigned] [Bug 133136] New: Latest emscripten life benchmark is 4x slower

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=133136

           Summary: Latest emscripten life benchmark is 4x slower
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: alonzakai at gmail.com


The emscripten-asmjs benchmarks on arewefastyet.com have been updated (new builds with latest emscripten). JSC is faster on all of those but one (which is expected, as the new benchmarks used a newer LLVM, emscripten improvements, etc.), but one of them, the life benchmark, became 4x slower. Source of benchmark is at

https://github.com/haytjes/arewefastyet/blob/master/benchmarks/asmjs-ubench/life.js

This is a microbenchmark and perhaps not that interesting, and the new builds speed up JSC everywhere else, especially on the large benchmarks. Still, perhaps something is being hit here that might show up in other places.

Measurement was done by arewefastyet itself ( http://arewefastyet.com/#machine=12&view=breakdown&suite=asmjs-ubench ) and happens on both 64 and 32 bit OS X, which I think means with and without FTL.

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