[webkit-dev] JS binding wapper pointers: inline vs. separate hash table

[Mike Belshe]

On Wed, Oct 1, 2008 at 5:03 PM, Maciej Stachowiak <mjs at apple.com> wrote:

>
> On Oct 1, 2008, at 4:48 PM, Peter Kasting wrote:
>
> On Wed, Oct 1, 2008 at 4:40 PM, Maciej Stachowiak <mjs at apple.com> wrote:
>
>> Do we have any measurements of the performance benefit?
>>
>
> Copying verbatim Feng's post on this from the other thread into this one:
>
>
> Oops, I missed that.
>
>
> These Node properties all return a DOM node, and it loops several
> times to minimize the overhead of other JS constructs.
> I reused Dromaeo framework to run the test. The test page has ~4600
> nodes. Using Dromaeo framework to run the test along, I observed that
> with Peerable cache, it is about 7~8% faster. When the test with other
> Dromaeo tests, I observed that Peerable was 25% faster, but other
> tests either faster or slower, so I cannot tell if that's because of
> real impact of caching or some other effects. One thing for sure is
> that when running whole Dromaeo tests, the memory usage went to to
> 430+MB. That's may have an effect.
>
>
> Sounds promising, though I'd like to see a test that combines some mutation
> with pure getters.
>
> It definitely sounds like it is worth experimenting with inline wrapper
> pointers only for selected classes, not for all RefCounted (or even for all
> bindable classes). Sounds like that could give a lot of the potential speed
> win, without nearly as much memory cost.
>

Agree :-)

Mike



>
> Regards,
> Maciej
>
>
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