nofib comparisons between 7.0.4, 7.4.2, 7.6.1, and 7.6.2

[Simon Peyton-Jones]

I believe fibon/ was helpfully added by someone, but never integrated into the nofib build system.  Just needs doing, I think

Simon

From: ghc-devs-bounces at haskell.org [mailto:ghc-devs-bounces at haskell.org] On Behalf Of Nicolas Frisby
Sent: 05 February 2013 09:24
To: Johan Tibell
Cc: ghc-devs at haskell.org
Subject: Re: nofib comparisons between 7.0.4, 7.4.2, 7.6.1, and 7.6.2

Is anyone familiar with the "fibon" directory within the nofib.git repository?

http://darcs.haskell.org/nofib/fibon/

Johan, this at least seems like an potential home for the additional programs you suggested adding. In particular, it has Repa, Dph, Shootout, and Hackage subdirectories.

I'm doing a GHC HQ internship at the moment, and one of the just-needs-to-happen tasks on my (growing) todo list is to look into fibon.

SPJ recalls that not all of the various building infrastructures were getting along. Anyone know the story? Thanks!

On Mon, Feb 4, 2013 at 10:33 PM, Johan Tibell <johan.tibell at gmail.com<mailto:johan.tibell at gmail.com>> wrote:
Hi all,

I haven't had much time to do performance tzar work yet, but I did run nofib on the last few GHC releases to see the current trend. The benchmarks where run on my 64-bit Core i7-3770 @ 3.40GHz Linux machine. Here are the results:

7.0.4 to 7.4.2:

--------------------------------------------------------------------------------
        Program           Size    Allocs   Runtime   Elapsed  TotalMem
--------------------------------------------------------------------------------
            Min          -1.6%    -57.3%    -39.1%    -36.4%    -25.0%
            Max         +21.5%   +121.5%    +24.5%    +25.4%   +300.0%
 Geometric Mean          +8.5%     -0.7%     -7.1%     -5.2%     +2.0%

The big loser here in terms of runtime is "kahan", which I added to test tight loops involving unboxed arrays and floating point arithmetic. I believe there was a regression in fromIntegral RULES during this release, which meant that some conversions between fixed-width types went via Integer, causing unnecessary allocation.

7.4.2 to 7.6.1:

--------------------------------------------------------------------------------
        Program           Size    Allocs   Runtime   Elapsed  TotalMem
--------------------------------------------------------------------------------
            Min          -5.1%    -23.8%    -11.8%    -12.9%    -50.0%
            Max          +5.3%   +225.5%     +7.2%     +8.8%   +200.0%
 Geometric Mean          -0.4%     +2.1%     +0.3%     +0.2%     +0.7%

The biggest loser here in terms of runtime is "integrate". I haven't looked into why yet.

7.6.1 to 7.6.2:

--------------------------------------------------------------------------------
        Program           Size    Allocs   Runtime   Elapsed  TotalMem
--------------------------------------------------------------------------------
            Min          -2.9%     +0.0%     -4.8%     -4.4%     -1.9%
            Max          +0.0%     +1.0%     +4.5%     +6.4%    +20.8%
 Geometric Mean          -1.7%     +0.0%     +0.1%     +0.3%     +0.2%

I have two takeaways:

 * It's worthwhile running nofib before releases as it does find some programs that regressed.
 * There are some other regressions out there (i.e. in code on Hackage) that aren't reflected here, suggesting that we need to add more programs to nofib.

Cheers,
Johan


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