#3039: strange space usage
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Reporter: igloo | Owner:
Type: run-time performance bug | Status: new
Priority: normal | Milestone: 6.12 branch
Component: Compiler | Version: 6.10.1
Severity: normal | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Os: Unknown/Multiple
Architecture: Unknown/Multiple |
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Changes (by igloo):
* milestone: => 6.12 branch
Comment:
One thing here that I think is a profiling bug is the biographical profile
output. One odd thing is that the amount of memory shown on the graph is
only half that shown on the `-hy` graph. The other thing is that it is
shown as all VOID, but if this is the filename then surely it should all
be DRAG?
Memory use drops by a factor of 10 when using `-C0`, and runtime drops a
little too:
{{{
./base +RTS -t
'z'
<<ghc: 35419752392 bytes, 43721 GCs, 445058/578064 avg/max bytes residency
(867 samples), 3M in use, 0.00 INIT (0.00 elapsed), 13.90 MUT (17.42
elapsed), 3.47 GC (3.40 elapsed) :ghc>>
./base +RTS -t 17.37s user 3.46s system 100% cpu 20.821 total
./base +RTS -t -C0
'z'
<<ghc: 35413940264 bytes, 43716 GCs, 45837/46328 avg/max bytes residency
(20 samples), 4M in use, 0.00 INIT (0.00 elapsed), 13.85 MUT (17.17
elapsed), 1.92 GC (1.89 elapsed) :ghc>>
./base +RTS -t -C0 15.78s user 3.28s system 99% cpu 19.062 total
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3039#comment:3>
GHC <http://www.haskell.org/ghc/>
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