#3331: control-monad-queue performance regression
-----------------------------------------+----------------------------------
Reporter: lpsmith | Owner:
Type: run-time performance bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.10.3
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
-----------------------------------------+----------------------------------
Changes (by igloo):
* difficulty: => Unknown
Comment:
Here are some numbers when compiling with `-O` and `-O2`, and with 6.8.2
and 6.10.3.
In particular, note the bytes allocated in the heap (the first number
after `<<ghc:`, which is roughly half for 6.8.2 `-O2`.
{{{
$ ghc-6.8.2 --make Time -O2 -Wall
$ time ./Time allison 34 20 +RTS -tstderr
./Time allison 34 20 +RTS -tstderr
allison
Timings: [74,70,69,69,69,70,69,69,69,69,69,68,69,68,69,69,68,70,68,69]
Sum: 1384
Minimum: 68
Maximum: 74
Mean: 69.2
Stddev: 1.2489995996796797
<<ghc: 7698344320 bytes, 14933 GCs, 10787493/25911296 avg/max bytes
residency (248 samples), 74M in use, 0.00 INIT (0.00 elapsed), 3.36 MUT
(3.47 elapsed), 10.50 GC (10.46 elapsed) :ghc>>
./Time allison 34 20 +RTS -tstderr 13.86s user 0.07s system 99% cpu
13.939 total
}}}
{{{
$ ghc-6.8.2 --make Time -O -Wall
$ time ./Time allison 34 20 +RTS -tstderr
./Time allison 34 20 +RTS -tstderr
allison
Timings: [88,82,82,82,82,82,82,82,83,82,82,81,83,82,83,82,82,82,82,83]
Sum: 1649
Minimum: 81
Maximum: 88
Mean: 82.45
Stddev: 1.3592277219068187
<<ghc: 15028226896 bytes, 28919 GCs, 10697618/26333184 avg/max bytes
residency (253 samples), 74M in use, 0.00 INIT (0.00 elapsed), 4.91 MUT
(4.92 elapsed), 11.57 GC (11.64 elapsed) :ghc>>
./Time allison 34 20 +RTS -tstderr 16.48s user 0.09s system 100% cpu
16.568 total
}}}
{{{
$ ghc-6.10.3 --make Time -O2 -Wall
$ time ./Time allison 34 20 +RTS -t
./Time allison 34 20 +RTS -t
allison
Timings: [92,86,86,86,86,86,87,86,86,86,85,85,85,85,85,85,85,86,85,85]
Sum: 1718
Minimum: 85
Maximum: 92
Mean: 85.9
Stddev: 1.5132745950421556
<<ghc: 15229851816 bytes, 29050 GCs, 10585871/25713256 avg/max bytes
residency (254 samples), 76M in use, 0.00 INIT (0.00 elapsed), 5.64 MUT
(6.26 elapsed), 11.56 GC (11.00 elapsed) :ghc>>
./Time allison 34 20 +RTS -t 17.20s user 0.07s system 100% cpu 17.261
total
}}}
{{{
$ ghc-6.10.3 --make Time -O -Wall
$ time ./Time allison 34 20 +RTS -t
./Time allison 34 20 +RTS -t
allison
Timings: [102,96,95,96,94,95,96,95,98,96,96,96,95,94,95,96,95,96,94,96]
Sum: 1916
Minimum: 94
Maximum: 102
Mean: 95.8
Stddev: 1.6911534525287764
<<ghc: 18790076976 bytes, 35841 GCs, 11806004/25067440 avg/max bytes
residency (229 samples), 74M in use, 0.00 INIT (0.00 elapsed), 7.46 MUT
(7.43 elapsed), 11.67 GC (11.81 elapsed) :ghc>>
./Time allison 34 20 +RTS -t 19.13s user 0.12s system 100% cpu 19.252
total
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3331#comment:1>
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