[Webkit-unassigned] [Bug 170774] New: WebAssembly: pre-allocate fast memories on iOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=170774

            Bug ID: 170774
           Summary: WebAssembly: pre-allocate fast memories on iOS
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jfbastien at apple.com
                CC: fpizlo at apple.com, jfbastien at apple.com,
                    keith_miller at apple.com, mark.lam at apple.com,
                    msaboff at apple.com, sbarati at apple.com
        Depends on: 170628
            Blocks: 159775

Bug #170628 adds capabilities to pre-allocate fast memories early to avoid fragmentation, but this is currently disabled because it's still possible to obtain bimodal performance numbers when stressing fast memory allocations.

Fix the underlying issues, and pre-allocate again.

Or close this as won't fix by making fragmentation at runtime a non-issue.

Also see bug #170773 which suggests giving up cached fast memories at runtime if they haven't been used in a while.


Referenced Bugs:

https://bugs.webkit.org/show_bug.cgi?id=159775
[Bug 159775] WebAssembly: support the newer spec
https://bugs.webkit.org/show_bug.cgi?id=170628
[Bug 170628] WebAssembly: manage memory better
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