#5505: Program runs faster with profiling than without
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Reporter: simonpj | Owner:
Type: bug | Status: new
Priority: high | Milestone: 7.4.1
Component: Compiler | Version: 7.6.1
Resolution: | Keywords:
Os: Windows | Architecture: Unknown/Multiple
Failure: Runtime performance bug | Difficulty:
Testcase: | Blockedby:
Blocking: | Related:
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Comment(by tomberek):
{{{
./Main.exe +RTS -s
222
CPU time: 1.87s
172,636 bytes allocated in the heap
980 bytes copied during GC
41,860 bytes maximum residency (1 sample(s))
19,580 bytes maximum slop
1 MB total memory in use (0 MB lost due to fragmentation)
Tot time (elapsed) Avg pause Max
pause
Gen 0 0 colls, 0 par 0.00s 0.00s 0.0000s
0.0000s
Gen 1 1 colls, 0 par 0.00s 0.00s 0.0001s
0.0001s
INIT time 0.00s ( 0.00s elapsed)
MUT time 1.87s ( 1.86s elapsed)
GC time 0.00s ( 0.00s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 1.87s ( 1.86s elapsed)
%GC time 0.0% (0.0% elapsed)
Alloc rate 92,219 bytes per MUT second
Productivity 100.0% of total user, 100.6% of total elapsed
./Main.exe +RTS -s -h
222
CPU time: 1.39s
172,892 bytes allocated in the heap
271,180 bytes copied during GC
78,104 bytes maximum residency (14 sample(s))
20,200 bytes maximum slop
1 MB total memory in use (0 MB lost due to fragmentation)
Tot time (elapsed) Avg pause Max
pause
Gen 0 0 colls, 0 par 0.00s 0.00s 0.0000s
0.0000s
Gen 1 14 colls, 0 par 0.00s 0.00s 0.0002s
0.0003s
INIT time 0.00s ( 0.00s elapsed)
MUT time 1.39s ( 1.37s elapsed)
GC time 0.00s ( 0.00s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 1.39s ( 1.38s elapsed)
%GC time 0.0% (0.2% elapsed)
Alloc rate 124,525 bytes per MUT second
Productivity 100.0% of total user, 100.7% of total elapsed
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5505#comment:14>
GHC <http://www.haskell.org/ghc/>
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