[webkit-dev] JavaScriptCore slowdown

[Filip Pizlo]

Couple of thoughts:

1) That’s unexpected.  You should file a bug on bugs.webkit.org.

2) SunSpider isn’t the best way to measure performance anymore.  Try one of the tests on http://browserbench.org <http://browserbench.org/> instead, they are more modern and we tend to use those instead of SunSpider these days.

-Filip


> On Jun 24, 2015, at 2:10 PM, Rodney Dowdall <rdowdall at cranksoftware.com> wrote:
> 
> Hello
> 
> I have two ports of WebKit.  The first is based off of revision 145828 and the second is based off of 184845.  I have compiled these ports for Linux x86 32 bit.  I would like to know why the port based on revision 145828 is faster at running the JavaScriptCore tests.  I have the DFG JIT enabled for both, and I do not have the FTL JIT turned on (obviously because it is not supported for 32  bit builds).  I was wondering if maybe I need to enable another setting the 184845 revision, but I think I have turned on all of the JavaScriptCore enablements that I can.  I can post these if it makes sense for me to do so.  Here are the numbers that I am getting from the two builds.  I am just wondering if this is what I should expect.
> 
> 184845 Webkit
> 
> Total:          522.9ms +/- 4.3%
> 
> 3d:            115.8ms +/- 10.2%
>   cube:        57.1ms +/- 13.8%
>   morph:        26.5ms +/- 10.2%
>   raytrace:        32.2ms +/- 4.5%
> 
> access:            45.3ms +/- 7.7%
>   binary-trees:    6.0 ms +/- 7.9%
>   fannkuch:        17.0 ms +/- 10.5%
>   nbody:        16.9 ms +/- 8.8%
>   nsieve:        5.4 ms +/- 9.3%
> 
> bitops:            17.2 ms +/- 12.8%
>   3bits-bits-in-byte:    3.6 ms +/- 31.3%
>   bits-in-byte:    4.4 ms +/- 15.7%
>   bitwise-and:        3.5 ms +/- 14.4%
>   nsieve-bits:        5.7 ms +/- 8.5%
> 
> controlflow:        6.2 ms +/- 4.9%
>   recursive:        6.3 ms +/- 4.9%
> 
> crypto:            57.9 ms +/- 4.8%
>   aes:            20.6 ms +/- 5.2%
>   md5:            23.5 ms +/- 4.8%
>   sha1:        13.8 ms +/- 5.3%
> 
> date:            61.9 ms +/- 3.5%
>   format-tofte:    29.6 ms +/- 3.3%
>   format-xparb:    32.3 ms +/- 3.9%
> 
> math:            33.4 ms +/- 5.1%
>   cordic:        6.4 ms +/- 14.1%
>   parial-sums:        22.3 ms +/- 4.5%
>   spectral-norm:    4.7 ms +/- 10.3%
> 
> regexp:            12.2 ms +/- 3.7%
>   dna:            12.2 ms +/- 3.7%
> 
> string:            173.0 ms +/- 2.2%
>   base64:         13.1 ms +/- 4.8%
>   fasta:         32.6 ms +/- 3.3%
>   tagcloud:         32.5 ms +/- 3.3%
>   unpack-code:         76.3 ms +/- 2.3%
>   validate-input        18.5 ms +/- 2.0%
> 
> 
> 145828 WebKit
> Total:            377.0 ms +/- 1.1%
> 
> 3d:            56.2 ms +/- 3.1%
>   cube:        20.7 ms +/- 6.7%
>   morph:        15.8 ms +/- 2.9%
>   raytrace:        19.7 ms +/- 2.4%
> 
> access:            26.3 ms +/- 2.9%
>   binary-trees:    2.1 ms +/- 10.8%
>   fannkuch:        11.2 ms +/- 5.9%
>   nbody:               8.3 ms +/- 4.2%
>   nsieve          4.7 ms +/- 14.4%
> 
> bitops:            19.3 ms +/- 4.6%
>   3bits-bits-in-byte:    2.1 ms +/- 10.8%
>   bits-in-byte:    11.2 ms +/- 14.6%
>   bitwise-and:        5.1 ms +/- 4.4%
>   nsieve-bits:        8.1 ms +/- 2.8%
> 
> controlflow:        3.2 ms +/- 9.4%
>   recursive:        3.2 ms +/- 9.4%
> 
> crypto:            31.2 ms +/- 3.4%
>   aes:            14.6 ms +/- 7.4%
>   md5:            9.5 ms +/- 4.0%
>   sha1:        7.1 ms +/- 3.2%
> 
> date:            64.8 ms +/- 3.7%
>  format-tofte:        29.4 ms +/- 5.0%
>  format-xparb:         35.4 ms +/- 3.2%
> 
> math:            39.8 ms +/- 3.8%
>   cordic:        5.8 ms +/- 5.2%
>   partial-sums:    30.2 ms +/- 4.7%
>   spectral-norm:    3.8 ms +/- 14.8%
> 
> regexp:            11.6 ms +/- 5.2%
>   dns:            11.6 ms +/- 5.2%
> 
> string:            124.6 ms +/- 1.8%
>   base64:        12.6 ms +/- 6.7%
>   fasta:        22.3 ms +/- 6.4%
>   tagcloud:        24.8 ms +/- 4.0%
>   unpack-code:        49.3 ms +/- 2.75
>   validate-input:    15.6 ms +/- 4.4%
> 
> Thanks,
> Rodney
> 
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