[Webkit-unassigned] [Bug 98586] Extend random precision to 53bits

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=98586





--- Comment #12 from Oliver Hunt <oliver at apple.com>  2012-10-07 12:06:43 PST ---
Those are fairly giant error margins, can you run with --runs 30 and make sure you aren't doing anything else at all while running? (Have all other applications closed, etc) 

(In reply to comment #10)
> (In reply to comment #2)
> > (From update of attachment 167443 [details] [details])
> > What's the performance impact of this?
> 
> I've run SunSpider.
> 
> Before applying patch
> ============================================
> RESULTS (means and 95% confidence intervals)
> --------------------------------------------
> Total:                 143.6ms +/- 2.7%
> --------------------------------------------
> 
>   3d:                   25.5ms +/- 5.3%
>     cube:                8.5ms +/- 4.4%
>     morph:               6.2ms +/- 7.3%
>     raytrace:           10.8ms +/- 6.8%
> 
>   access:               11.4ms +/- 4.4%
>     binary-trees:        1.0ms +/- 0.0%
>     fannkuch:            5.1ms +/- 4.4%
>     nbody:               3.0ms +/- 0.0%
>     nsieve:              2.3ms +/- 15.0%
> 
>   bitops:                7.1ms +/- 3.2%
>     3bit-bits-in-byte:   1.0ms +/- 0.0%
>     bits-in-byte:        2.0ms +/- 0.0%
>     bitwise-and:         1.1ms +/- 20.5%
>     nsieve-bits:         3.0ms +/- 0.0%
> 
>   controlflow:           1.2ms +/- 25.1%
>     recursive:           1.2ms +/- 25.1%
> 
>   crypto:               12.7ms +/- 2.7%
>     aes:                 7.7ms +/- 4.5%
>     md5:                 3.0ms +/- 0.0%
>     sha1:                2.0ms +/- 0.0%
> 
>   date:                 19.6ms +/- 2.5%
>     format-tofte:       10.7ms +/- 3.2%
>     format-xparb:        8.9ms +/- 2.5%
> 
>   math:                 11.7ms +/- 5.8%
>     cordic:              3.0ms +/- 0.0%
>     partial-sums:        6.7ms +/- 10.1%
>     spectral-norm:       2.0ms +/- 0.0%
> 
>   regexp:                9.0ms +/- 9.2%
>     dna:                 9.0ms +/- 9.2%
> 
>   string:               45.4ms +/- 3.3%
>     base64:              4.0ms +/- 0.0%
>     fasta:               5.8ms +/- 5.2%
>     tagcloud:           10.9ms +/- 7.8%
>     unpack-code:        19.6ms +/- 3.9%
>     validate-input:      5.1ms +/- 4.4%
> 
> After applying patch
> ============================================
> RESULTS (means and 95% confidence intervals)
> --------------------------------------------
> Total:                 144.1ms +/- 1.7%
> --------------------------------------------
> 
>   3d:                   26.7ms +/- 6.6%
>     cube:                9.1ms +/- 5.8%
>     morph:               6.4ms +/- 9.4%
>     raytrace:           11.2ms +/- 7.2%
> 
>   access:               11.3ms +/- 4.3%
>     binary-trees:        1.1ms +/- 20.5%
>     fannkuch:            5.0ms +/- 0.0%
>     nbody:               3.0ms +/- 0.0%
>     nsieve:              2.2ms +/- 13.7%
> 
>   bitops:                7.4ms +/- 5.0%
>     3bit-bits-in-byte:   1.0ms +/- 0.0%
>     bits-in-byte:        2.0ms +/- 0.0%
>     bitwise-and:         1.4ms +/- 26.4%
>     nsieve-bits:         3.0ms +/- 0.0%
> 
>   controlflow:           1.2ms +/- 25.1%
>     recursive:           1.2ms +/- 25.1%
> 
>   crypto:               12.9ms +/- 1.8%
>     aes:                 7.9ms +/- 2.9%
>     md5:                 3.0ms +/- 0.0%
>     sha1:                2.0ms +/- 0.0%
> 
>   date:                 19.8ms +/- 1.5%
>     format-tofte:       10.8ms +/- 2.8%
>     format-xparb:        9.0ms +/- 0.0%
> 
>   math:                 11.0ms +/- 0.0%
>     cordic:              3.0ms +/- 0.0%
>     partial-sums:        6.0ms +/- 0.0%
>     spectral-norm:       2.0ms +/- 0.0%
> 
>   regexp:                8.9ms +/- 2.5%
>     dna:                 8.9ms +/- 2.5%
> 
>   string:               44.9ms +/- 2.2%
>     base64:              4.0ms +/- 0.0%
>     fasta:               5.8ms +/- 5.2%
>     tagcloud:           10.6ms +/- 3.5%
>     unpack-code:        19.4ms +/- 2.6%
>     validate-input:      5.1ms +/- 4.4%
> 
> I think the performance impact of this is small and acceptable.

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