[Webkit-unassigned] [Bug 14808] New: REGRESSION: Significant slowdown with hang while signing into newsgator.com

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=14808

           Summary: REGRESSION: Significant slowdown with hang while signing
                    into newsgator.com
           Product: WebKit
           Version: 522+ (nightly)
          Platform: All
        OS/Version: All
            Status: NEW
          Keywords: Regression, NeedsRadar
          Severity: Normal
          Priority: P1
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pewtermoose at gmail.com


Between Safari 3.0.2 Beta and ToT, signing into newsgator.com (using their
'beta' reader, haven't tried the 'classic' one) has slowed significantly. On my
1.2GHz G4 machine, a local debug build of r24761 hangs Safari for about a
minute, the latest nightly (also r24761) for about 30 seconds while Safari
3.0.2 Beta only takes roughly 5 seconds.  My significantly faster Windows box
also shows a large slowdown between 3.0.2 Beta and ToT.

I've created an account with the username/password of webkit/webkit for
testing.  The number of feeds does not seem to matter - the WebKit test account
only has 1 feed while my personal one has about 85 with roughly the same hang
time for each.

r24761 debug sample:
Sort by top of stack, same collapsed (when >= 5):
        mach_msg_trap        863
        select        288
        semaphore_wait_signal_trap        288
        KJS::PropertyMap::mark() const        56
        KJS::JSImmediate::isImmediate(KJS::JSValue const*)        28
        KJS::Collector::collect()        26
        KJS::JSImmediate::getTag(KJS::JSValue const*)        23
        KJS::JSValue::mark()        20
        KJS::Collector::cellBlock(KJS::JSCell const*)        16
        KJS::Collector::cellOffset(KJS::JSCell const*)        13
        KJS::CollectorBitmap::get(unsigned long) const        13
        KJS::Collector::isCellMarked(KJS::JSCell const*)        11
        KJS::JSValue::asCell() const        11
        KJS::JSValue::marked() const        9
        KJS::JSValue::asCell()        8
        KJS::Collector::markCell(KJS::JSCell*)        7
        KJS::JSCell::marked() const        7
        KJS::ArrayInstance::mark()        5
        KJS::Collector::cellBlock(KJS::JSCell*)        5
        KJS::CollectorBitmap::set(unsigned long)        5


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