GHC HEAD (built with itself) blows allocation stats :-(

[Jan Stolarek]

Sanity check: was the stage0 compiler built using "perf" settings?

Janek

Dnia poniedziałek, 30 maja 2016, Gabor Greif napisał:
> Hi devs,
>
> I get some pretty bad allocation statistics when testing GHC HEAD. Not sure
> why, but this is with a stage-0 compiler that is also GHC HEAD. (I doubt
> that that is the reason, though.)
>
> I see on a linux x64 system (RHEL6) :
>
> Unexpected stat failures:
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T10370      T10370 [stat
> not good enough] (optasm)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T10547      T10547 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T1969       T1969 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T3064       T3064 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T3294       T3294 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T4801       T4801 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T5030       T5030 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T5321FD     T5321FD [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T5321Fun    T5321Fun
> [stat not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T5631       T5631 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T5642       T5642 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T5837       T5837 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T6048       T6048 [stat
> not good enough] (optasm)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T783        T783 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T9020       T9020 [stat
> not good enough] (optasm)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T9233       T9233 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T9675       T9675 [stat
> not good enough] (optasm)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T9872a      T9872a [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T9872b      T9872b [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T9872c      T9872c [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T9872d      T9872d [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T9961       T9961 [stat
> not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/parsing001  parsing001
> [stat not good enough] (normal)
>    /tmp/ghctest/ayiNBP/1/2/3/./perf/space_leaks/T4029    T4029 [stat
> not good enough] (ghci)
>
>
> Some of the tests look like this:
>
> cd /tmp/ghctest/ayiNBP/1/2/3/./perf/compiler/T9872a &&
> "ghc-head-x86_64/inplace/test   spaces/ghc-stage2" -c T9872a.hs
> -fforce-recomp -dno-debug-output -no-user-package-db -rtsopts
> -fno-warn-tabs -fno-warn-missed-specialisations -fshow-warning-groups
> -fno-ghci-history   +RTS -V0 -tT9872a.comp.stats --machine-readable
> -RTS > T9872a.comp.stderr 2>&1
> bytes allocated value is too high:
>     Expected    T9872a(normal) bytes allocated:  3352882080 +/-5%
>     Lower bound T9872a(normal) bytes allocated:  3185237976
>     Upper bound T9872a(normal) bytes allocated:  3520526184
>     Actual      T9872a(normal) bytes allocated: 13260131240
>     Deviation   T9872a(normal) bytes allocated:       295.5 %
> *** unexpected stat test failure for T9872a(normal)
>
> Around 300% looks really bad. Can anybody reproduce this? For
> reference, this is the test command I run:
>
> $ make test TEST="T9961 T10547 T10370 T3064 T4029 T5642 parsing001
> T783 T3294 T9872d T9872b T9872c T9872a T1969 T5321Fun T5837 T5631
> T5321FD T5030 T4801 T6048 T9675 T9233 T9020"
>
> The testsuite works nicely otherwise.
>
> Cheers and thanks,
>
>     Gabor
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--- 
Politechnika Łódzka 
Lodz University of Technology 

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