nofib comparisons between 7.0.4, 7.4.2, 7.6.1, and 7.6.2
Simon Marlow
marlowsd at gmail.com
Tue Feb 5 11:33:39 CET 2013
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 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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