#5954: Performance regression 7.0 -> 7.2 (still in 7.4)
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Reporter: simonmar | Owner:
Type: bug | Status: new
Priority: high | Milestone: 7.4.2
Component: Compiler | Version: 7.4.1
Keywords: | Os: Unknown/Multiple
Architecture: Unknown/Multiple | Failure: Runtime performance bug
Difficulty: Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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The program in `nofib/parallel/blackscholes` regressed quite badly in
performance between 7.0.x and 7.2.1. This is just sequential performance,
no parallelism.
With 7.0:
{{{
3,084,786,008 bytes allocated in the heap
5,150,592 bytes copied during GC
33,741,048 bytes maximum residency (7 sample(s))
1,541,904 bytes maximum slop
64 MB total memory in use (2 MB lost due to fragmentation)
Generation 0: 5760 collections, 0 parallel, 0.08s, 0.08s elapsed
Generation 1: 7 collections, 0 parallel, 0.01s, 0.01s elapsed
INIT time 0.00s ( 0.00s elapsed)
MUT time 17.43s ( 17.47s elapsed)
GC time 0.09s ( 0.09s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 17.53s ( 17.56s elapsed)
}}}
With 7.2.2:
{{{
3,062,127,752 bytes allocated in the heap
4,714,784 bytes copied during GC
34,370,232 bytes maximum residency (7 sample(s))
1,553,968 bytes maximum slop
64 MB total memory in use (2 MB lost due to fragmentation)
Tot time (elapsed) Avg pause Max
pause
Gen 0 5781 colls, 0 par 0.08s 0.08s 0.0000s
0.0006s
Gen 1 7 colls, 0 par 0.01s 0.01s 0.0014s
0.0017s
INIT time 0.00s ( 0.00s elapsed)
MUT time 23.93s ( 23.93s elapsed)
GC time 0.09s ( 0.09s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 24.02s ( 24.03s elapsed)
}}}
and with 7.4.1:
{{{
3,061,924,144 bytes allocated in the heap
4,733,760 bytes copied during GC
34,210,896 bytes maximum residency (7 sample(s))
1,552,640 bytes maximum slop
64 MB total memory in use (2 MB lost due to fragmentation)
Tot time (elapsed) Avg pause Max
pause
Gen 0 5781 colls, 0 par 0.08s 0.08s 0.0000s
0.0007s
Gen 1 7 colls, 0 par 0.01s 0.01s 0.0015s
0.0017s
INIT time 0.00s ( 0.00s elapsed)
MUT time 23.90s ( 23.91s elapsed)
GC time 0.09s ( 0.09s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 24.00s ( 24.00s elapsed)
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5954>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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