#1216: indexing 2d arrays is slow and leaky. why?
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Reporter: claus | Owner: simonpj
Type: bug | Status: new
Priority: normal | Milestone: 6.12.1
Component: Compiler | Version: 6.6
Resolution: | Keywords:
Difficulty: Unknown | Os: Unknown/Multiple
Testcase: | Architecture: Unknown/Multiple
Failure: Runtime performance bug |
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Changes (by daniel.is.fischer):
* cc: [email protected] (added)
Comment:
Still slow and also overallocating in 6.10.3:
{{{
./indexL 100000 +RTS -sstderr
array (1,40) [snip]
7,132,475,396 bytes allocated in the heap
935,808 bytes copied during GC
31,748 bytes maximum residency (1 sample(s))
22,992 bytes maximum slop
1 MB total memory in use (0 MB lost due to fragmentation)
Generation 0: 13604 collections, 0 parallel, 0.20s, 0.16s elapsed
Generation 1: 1 collections, 0 parallel, 0.00s, 0.00s elapsed
INIT time 0.00s ( 0.00s elapsed)
MUT time 11.34s ( 11.42s elapsed)
GC time 0.20s ( 0.16s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 11.55s ( 11.58s elapsed)
%GC time 1.8% (1.4% elapsed)
Alloc rate 628,705,232 bytes per MUT second
Productivity 98.2% of total user, 97.9% of total elapsed
da...@linux-mkk1:~/Haskell/CafeTesting> ./indexH +RTS -sstderr -RTS 100000
./indexH 100000 +RTS -sstderr
array (1,40) [snip]
9,800,880 bytes allocated in the heap
11,908 bytes copied during GC
31,696 bytes maximum residency (1 sample(s))
22,992 bytes maximum slop
1 MB total memory in use (0 MB lost due to fragmentation)
Generation 0: 18 collections, 0 parallel, 0.00s, 0.00s elapsed
Generation 1: 1 collections, 0 parallel, 0.00s, 0.00s elapsed
INIT time 0.00s ( 0.00s elapsed)
MUT time 3.80s ( 3.80s elapsed)
GC time 0.00s ( 0.00s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 3.80s ( 3.80s elapsed)
%GC time 0.0% (0.0% elapsed)
Alloc rate 2,581,735 bytes per MUT second
Productivity 100.0% of total user, 100.0% of total elapsed
}}}
Both compiled with -O2.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1216#comment:14>
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