Re: nofib comparisons between 7.0.4, 7.4.2, 7.6.1, and 7.6.2

On 05/02/13 10:13, Simon Peyton-Jones wrote:

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

Right - I think it was even integrated into the build system, but it wasn't turned on by default. I tried it once and something didn't work, and I didn't have the time to fix it then. There are some other collections of programs in nofib that aren't run by default: nofib/gc My GC benchmarks (some of these overlap with the rest of nofib, but might have different inputs/parameters). I usually run these when I change something in the GC. nofib/smp The concurrency benchmarks. Edward is using these to tune his new scheduler. These could be enabled by default. nofib/parallel The parallel benchmarks. It wouldn't hurt to run these by default too, on at least 1 core and maybe more. I generally run them on 8 cores when I change something in the RTS. Cheers, Simon

Simon

*From:*ghc-devs-bounces@haskell.org [mailto:ghc-devs-bounces@haskell.org] *On Behalf Of *Nicolas Frisby *Sent:* 05 February 2013 09:24 *To:* Johan Tibell *Cc:* ghc-devs@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 mailto:johan.tibell@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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