[Webkit-unassigned] [Bug 97510] New: Some perf. tests have variances that differ greatly between runs

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97510

           Summary: Some perf. tests have variances that differ greatly
                    between runs
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: eric at webkit.org, mjs at apple.com, abarth at webkit.org,
                    ojan at chromium.org, morrita at google.com,
                    haraken at chromium.org
            Blocks: 77037


Created an attachment (id=165486)
 --> (https://bugs.webkit.org/attachment.cgi?id=165486&action=review)
Two consecutive runs of perf. tests at r129387

floats_20_100 has really small in-run variances but has a large between-run variance:
http://webkit-perf.appspot.com/graph.html#tests=[[477032,2001,3001]]&sel=1347931595661,1348536395661,408.9015180414373,486.55303319295246&displayrange=7&datatype=running

Bindings/scroll-top has the same problem:
http://webkit-perf.appspot.com/graph.html#tests=[[2932950,2001,3001],[2932950,2001,963028],[2932950,2001,32196]]&sel=1347932196853.843,1348536395661,24.128788890260637,166.97916767813942&displayrange=7&datatype=running

So does Dromaeo/jslib-attr-prototype:
http://webkit-perf.appspot.com/graph.html#tests=[[45011,2001,3001],[45011,2001,963028],[45011,2001,32196]]&sel=1347932196853.843,1348536395661&displayrange=7&datatype=running

All these tests result in false positive on results page (see attachment).

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