[webkit-help] tryFastMalloc usage
cmg473 at motorola.com
Wed Mar 28 11:34:17 PDT 2012
Ah yes !, thanks Zoltan and Sriram.
On Wed, Mar 28, 2012 at 12:32 AM, Zoltan Horvath <zoltan at webkit.org> wrote:
> currently WebKit supports usage either of system-malloc or TCmalloc. It
> depends on your platform whether USE_SYSTEM_MALLOC macro is defined to 1 or
> By default WebKit builds with TCmalloc, but you can pass --system-malloc
> option to build-webkit and it will set the macro for you to 1.
> FastMalloc is only a wrapper, but you can find TCmalloc's implementation
> in FastMalloc.cpp.
> On Wed, 28 Mar 2012 01:50:24 +0200, Fabrice Robinet <cmg473 at motorola.com>
> Hi group,
>> In short: I wonder where tryFastMalloc should be used, and what's *really*
>> implemented in it (or should be).
>> Longer story:
>> According to the .cpp, it is supposed to use a cache, which would justify
>> the "fast" in the function name.
>> From FastMalloc.cpp
>> // A malloc that uses a per-thread cache to satisfy small malloc requests.
>> // (The time for malloc/free of a small object drops from 300 ns to 50
>> But looking at the current source tryFastMalloc looks to just wrap
>> malloc. (I just updated Chromium and thus WebCore too...),
>> I have seen tryFastMalloc used in WebCore code that is not too old (like
>> so I believe it is not deprecated and *should* be used, so this raises a
>> couple of questions:
>> Is current state of tryFastMalloc temporary in the sense that a cache will
>> be used eventually ?
>> Did I miss something about this cache in the implementation ?
>> Are there (updated) guidelines about the usage of tryFastMalloc ?
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> webkit-help at lists.webkit.org
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