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List:       webkit-dev
Subject:    Re: [webkit-dev] Iterating SunSpider
From:       Maciej Stachowiak <mjs () apple ! com>
Date:       2009-07-05 22:05:41
Message-ID: 67C6FE36-70BE-4C9D-BCC5-1794B5BA16EB () apple ! com
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On Jul 5, 2009, at 9:58 AM, Joe Mason wrote:

> Maciej Stachowiak wrote:
>> I think the pauses were large in an attempt to get stable,  
>> repeatable results, but are probably longer than necessary to  
>> achieve this. I agree with you that the artifacts in "balanced"  
>> power mode are a problem. Do you know what timer thresholds avoid  
>> the effect? I think this would be a reasonable "1.0" kind of change.
>
> Just a gut feeling, but I suspect the exact throttling algorithm  
> would vary too much from machine to machine and OS version to OS  
> version to ever find a good threshold to avoid it.  The best thing  
> to do would be to have the harness turn off CPU throttling when it  
> starts.  (This is possible from the commandline under Linux, and I  
> assume in Mac, but Windows might be a problem.)

The command line harness doesn't pause at all. It's the in-browser  
harness is the one we are concerned about. We obviously can't turn off  
CPU throttling from the JavaScript level. I'll see if I can still get  
repeatable cross-browser results with a much smaller delay.

Regards,
Maciej

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