space/speed tradeoff in configuring TT

Steven Johnson stejohns at adobe.com
Mon Jun 30 17:35:37 PDT 2008


I¹m guessing that picking just a half-dozen files and optimizing for speed
would make a big diff: VMInterp.cpp, SymTable.cpp, a few others....


On 6/30/08 5:32 PM, "Edwin Smith" <edwsmith at adobe.com> wrote:

> awesome!
>  
> We're making use of the x-platform build scripts, which enable flexibly
> generating makefiles for different configurations.  There is no "prefer size
> or speed" configuration option; lacking such a thing, the default should be a
> good blend.  Given the current climate of the project i'd go out on a limb and
> say 13% size increase is worth a 13% speedup, especially knowing that we can
> get back a lot of that size increase by doing the work of picking which subset
> of source files to optimize for speed.
>  
> The windows x-platform build scripts for TT were broken for a while, but I
> just saw a patch that should fix them.
>  
> Ed
>  
> 
> From: tamarin-devel-bounces at mozilla.org
> [mailto:tamarin-devel-bounces at mozilla.org] On Behalf Of Haghighat, Mohammad R
> Sent: Monday, June 30, 2008 8:25 PM
> To: 'tamarin-devel at mozilla.org'
> Subject: space/speed tradeoff in configuring TT
>  
> In TT configuration on Windows, by replacing the current optimization settings
> tuple (/Ox, /Os) which favors smaller code size over speed to (/O2, /Ot) which
> favors speed, one can achieve good speedups. The binary size is increased by
> ~13% (407552 -> 460288 : 12.9%) while the average speedup on Sunspider is
> 13.8%. I¹ve not measured the impact on other platforms, but the results might
> be helpful in deciding where to put the cutoff line in the space/speed
> tradeoff. Do we have a guiding principle?
>  
> - moh
>  
>  https://bugzilla.mozilla.org/show_bug.cgi?id=428562
>  
> Core2-Duo
>  
> C:\tamarin-tracing\test\performance>runtests.py -i 50 sunspider/
> Executing tests at 2008-06-30 16:24:10.343000
> avm: C:\tamarin-tracing\platform\win32\obj_9\shell\Release\avm_orig.exe
> avm2: C:\tamarin-tracing\platform\win32\obj_9\shell\Release\avm2_O2Ot.exe
>  
> test                                                  avm   avm2     %sp
>  
> sunspider/access-binary-trees.as                    219.0   187.0    14.6
> sunspider/access-fannkuch.as                        422.0   360.0    14.7
> sunspider/access-nbody.as                           484.0   375.0    22.5
> sunspider/access-nsieve.as                          172.0   156.0     9.3
> sunspider/bitops-3bit-bits-in-byte.as                32.0    31.0     3.1
> sunspider/bitops-bits-in-byte.as                    109.0    94.0    13.8
> sunspider/bitops-bitwise-and.as                     578.0   500.0    13.5
> sunspider/bitops-nsieve-bits.as                     172.0   140.0    18.6
> sunspider/controlflow-recursive.as                   94.0    78.0    17.0
> sunspider/crypto-aes.as                             469.0  406.0    13.4
> sunspider/crypto-md5.as                             422.0   360.0    14.7
> sunspider/crypto-sha1.as                            110.0    94.0    14.5
> sunspider/math-cordic.as                            125.0   110.0    12.0
> sunspider/math-partial-sums.as                      640.0   531.0    17.0
> sunspider/math-spectral-norm.as                     109.0    94.0    13.8
> sunspider/s3d-cube.as                               469.0   406.0    13.4
> sunspider/s3d-morph.as                              265.0   250.0     5.7
> sunspider/s3d-raytrace.as                           609.0   515.0    15.4
> sunspider/string-fasta.as                           359.0   312.0    13.1
> sunspider/string-validate-input.as                  812.0   687.0    15.4
> 
> 
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