[Webkit-unassigned] [Bug 139738] New: run-webkit-tests significantly slows down when running the last bunch tests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=139738

            Bug ID: 139738
           Summary: run-webkit-tests significantly slows down when running
                    the last bunch tests
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: iOS
                OS: iOS 8.1
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: dbates at webkit.org

I noticed when using run-webkit-tests to run iOS layout tests using WebKit1 an WebKit2 that the rate at which tests are run significantly slows down as run-webkit-tests nears completion. This behavior tends to be more noticeable when running large batches of tests (> 10000). I am using a Mac Pro with 2 x 2.66 GHz 6-Core Intel Xeon processors, 12 GB RAM, OS X Yosemite (14A378) with a debug build of WebKit at r177430.

I invoke run-webkit-tests to run tests using WebKit2 with a command line of the form:

Tools/Scripts/run-webkit-tests --ios-sim --runtime com.apple.CoreSimulator.SimRuntime.iOS-[...] --device-type com.apple.CoreSimulator.SimDeviceType.iPhone-5s --no-sample-on-timeout --results-directory layout-test-results-rebase -2 [...]

(I omit the argument -2 in the above command to run the specified tests using WebKit1).

When invoked with [...] as the empty string (i.e. to run the full suite of layout tests), run-webkit-test will run 24 instances of WebKitTestRunnerApp.app in parallel.

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