nofib regressions in HEAD since 7.6.2 release

[Nicolas Frisby]

I'm using the bindists for some versions, and the ~simonmar/fp/ installs
(which I've assumed are bindist) for the ones that already existed there
(ie 7.0.1 to 7.4.1, excepting 7.0.4).

$ md5sum ghc*bz2
0fc26b4c1d10ff9dc8b0cbe9453d48d3  ghc-7.0.4-x86_64-unknown-linux.tar.bz2
de67ecfe619b0126d8a8b93d26f34555  ghc-7.4.2-x86_64-unknown-linux.tar.bz2
23da3285c5f8fe6716e2795d149c6b96  ghc-7.6.1-x86_64-unknown-linux.tar.bz2
230270a985c522af939d9c71aa76343f  ghc-7.6.2-x86_64-unknown-linux.tar.bz2



On Tue, Feb 12, 2013 at 11:09 AM, Simon Marlow <marlowsd at gmail.com> wrote:

> On 12/02/13 03:17, Johan Tibell wrote:
>
>> Hi Nicolas!
>>
>> I tried to reproduce the difference between 7.0.4 and 7.6.2 on the
>> exp3_8, wheel-sieve1, and primes and couldn't get the same percent
>> difference as you. We need to reconcile these differences somehow. Lets
>> start with more exact machine specs. I have a:
>>
>> ------------------------------**------------------------------**
>> --------------------
>>          Program           Size    Allocs   Runtime   Elapsed  TotalMem
>> ------------------------------**------------------------------**
>> --------------------
>>       bernouilli          +3.3%     +0.2%      0.12      0.13     +0.0%
>>           exp3_8          +1.1%    +53.7%      0.14      0.14   +300.0%
>>      gen_regexps         +18.7%     +3.9%      0.00      0.00     +0.0%
>>        integrate          -0.1%    +39.0%      0.21      0.23     +0.0%
>>            kahan          +1.7%    +98.6%     +9.9%     +7.3%     +0.0%
>>        paraffins          +1.3%     -1.2%      0.06      0.08     +0.0%
>>           primes          +1.4%    +64.7%      0.04      0.05    +50.0%
>>           queens          +0.8%     -0.5%      0.02      0.02     +0.0%
>>             rfib          +1.7%    +42.8%      0.02      0.02     +0.0%
>>              tak          +0.9%    +12.0%      0.01      0.01     +0.0%
>>     wheel-sieve1          +0.8%    +66.6%     -4.6%     -5.8%    -12.5%
>>     wheel-sieve2          +0.9%     +0.0%      0.12      0.13     +0.0%
>>             x2n1         +10.3%    +87.3%      0.00      0.01   +200.0%
>> ------------------------------**------------------------------**
>> --------------------
>>              Min          -0.1%     -1.2%     -4.6%     -5.8%    -12.5%
>>              Max         +18.7%    +98.6%     +9.9%     +7.3%   +300.0%
>>   Geometric Mean          +3.2%    +31.7%     +2.4%     +0.5%    +23.6%
>>
>
> Some of these benchmarks essentially do no allocation in their inner loops
> (x2nl, rfib, tak), so differences there just indicate changes in the IO
> library or elsewhere, and aren't significant.
>
> Is your 7.6.2 from our binary distributions, or did you build it yourself?
>
> Cheers,
>         Simon
>
>
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