[webkit-dev] Re: [webkit-changes] [24907] trunk

Mitz Pettel opendarwin.org at mitzpettel.com
Tue Aug 7 07:44:51 PDT 2007

On Aug 7, 2007, at 5:22 PM, Antti Koivisto wrote:

> On 8/7/07, Mitz Pettel <opendarwin.org at mitzpettel.com> wrote:
>> On Aug 7, 2007, at 2:15 PM, antti at webkit.org wrote:
>> - added performance test. With debug build on MBP this takes about  
>> 1.5s to
>> run.
>> * fast/block/basic/stress-shallow-nested-expected.txt: Added.
>> * fast/block/basic/stress-shallow-nested.html: Added.
>> (emphases mine). Nothing about that makes sense to me.
> Are you objecting to testing performance regressions as part of the
> test suite in general or particular method here? I'm open to
> suggestions.

Hi Antti,

I do not understand the purpose of the test and how it is supposed to  
serve that purpose (two of the reasons that I am baffled are that it  
is my understanding that there are facilities to track performance  
within fractions of a percent, and that I am not aware of other tests  
that have use elapsed time internally as their success criterion).

> It does not take long to run (300ms on release, 1.5s on debug MBP) so
> I thought it would be appropriate for automatic test. There are
> similar cases in the suite already. It needs to have non-zero
> execution time so that O(n^2) nature of the bug shows up in testable
> way.

On the computer I run the tests on, that single test alone takes  
roughly as much time as all the other 229 tests in fast/block together.

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