[Webkit-unassigned] [Bug 61184] New: Web Inspector: [JSC] Searching in a bottom-up view of a large CPU profile overloads system

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=61184

           Summary: Web Inspector: [JSC] Searching in a bottom-up view of
                    a large CPU profile overloads system
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
               URL: http://v8.googlecode.com/svn/data/benchmarks/current/r
                    un.html
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Web Inspector
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mnaganov at chromium.org
                CC: timothy at apple.com, rik at webkit.org, keishi at webkit.org,
                    pmuellr at yahoo.com, joepeck at webkit.org,
                    pfeldman at chromium.org, yurys at chromium.org,
                    bweinstein at apple.com, apavlov at chromium.org,
                    loislo at chromium.org


What steps will reproduce the problem?
1. Gather a CPU profile from V8 benchmarks site: http://v8.googlecode.com/svn/data/benchmarks/current/run.html
2. Try to search in bottom-up view.

Search hogs all time of a CPU core.

This problem originates from the fact that in WebKit Inspector the bottom 
up tree is built dynamically from the top down tree. Thus, to perform a 
search in a bottom up tree, it first needs to be fully built, as a result,
Inspector eats up an enormous amount of memory.

It seems that an approach to maintaining calls tree needs to be reworked in 
WebKit Inspector.

Consider https://bugs.webkit.org/show_bug.cgi?id=24604 when implementing,
to avoid incorrect calculation of execution times.

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