[Webkit-unassigned] [Bug 114824] New: Garbage Collection of Typed Arrays Fails

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=114824

           Summary: Garbage Collection of Typed Arrays Fails
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.8
            Status: UNCONFIRMED
          Severity: Major
          Priority: P3
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: amit at zooniverse.org


Created an attachment (id=198755)
 --> (https://bugs.webkit.org/attachment.cgi?id=198755&action=review)
Example of typed array initialization and failure of garbage collector.

Steps to reproduce the problem:

1. Define a function that initializes a typed array.
2. Execute the function.
3. Observe the typed array not being garbage collected when falling out of scope.

The garbage collector should release memory from all variables defined in the function closure.  Memory associated with the typed array is not released at any point during the life cycle of the web app.  Memory is not released on tab close, but only on application close.

Additionally, allocating a typed array seems to consume more memory than it should.  For example,

var arr = new Float32Array(268435456);

allocates 1 gigabyte for array storage; however, WebKit consumes ~4 GB.

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