[Webkit-unassigned] [Bug 40605] New: Excessive memory using when communicating with a worker

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=40605

           Summary: Excessive memory using when communicating with a
                    worker
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: skoom at me.com


Created an attachment (id=58742)
 --> (https://bugs.webkit.org/attachment.cgi?id=58742)
index.html and worker.js to demonstrate the issue

using 200,000 'lorem' strings I did a few tests and it looks like simply sending messages between a worker and the thing that created it uses a massive amount of ram, despite the messages not being stored anywhere in JS code.

Below are the tests and the memory usage I got from Activity Monitor. I have also attached the code that can replace this.

sending messages to the worker only
real memory size: 336mb
virtual memory size: 5.02mb
private memory size: 70.1mb
virtual private memory: 309mb

sending messages to the worker and the worker sending the same messages back
real memory size: 533mb
virtual memory size: 5.2gb
private memory size: 112mb
virtual private memory: 663mb

adding strings to an array
real memory size: 103mb
virtual memory size: 4.79gb
private memory size: 58mb
virtual private memory: 202mb

adding strings to an object
real memory size: 128mb
virtual memory size: 4.82gb
private memory size: 87mb
virtual private memory: 262mb

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