#3838: Performance issues with blackholes
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Reporter: simonmar | Owner: simonmar
Type: bug | Status: new
Priority: normal | Milestone: 6.14 branch
Component: Runtime System | Version: 6.12.1
Keywords: | Difficulty:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: Runtime performance bug
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Comment(by simonmar):
After several weeks of research, heated discussion, hacking, epic
debugging, and with casualties including one whiteboard:
{{{
> ./thread-delay -n 20000 +RTS -s
./thread-delay -n 20000 +RTS -s
134,165,424 bytes allocated in the heap
151,967,568 bytes copied during GC
23,767,936 bytes maximum residency (7 sample(s))
7,930,616 bytes maximum slop
81 MB total memory in use (1 MB lost due to fragmentation)
Generation 0: 239 collections, 0 parallel, 0.25s, 0.25s elapsed
Generation 1: 7 collections, 0 parallel, 0.10s, 0.15s elapsed
Parallel GC work balance: nan (0 / 0, ideal 1)
MUT time (elapsed) GC time (elapsed)
Task 0 (worker) : 0.00s ( 0.16s) 0.00s ( 0.00s)
Task 1 (worker) : 0.00s ( 0.00s) 0.25s ( 0.28s)
Task 2 (worker) : 0.00s ( 0.16s) 0.00s ( 0.00s)
Task 3 (bound) : 0.00s ( 0.16s) 0.09s ( 0.11s)
SPARKS: 0 (0 converted, 0 pruned)
INIT time 0.00s ( 0.00s elapsed)
MUT time 0.14s ( 0.16s elapsed)
GC time 0.34s ( 0.40s elapsed)
EXIT time 0.00s ( 0.00s elapsed)
Total time 0.48s ( 0.56s elapsed)
}}}
And it always runs in <0.6s. Now all I have to do is get these patches
cleaned up and committed.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3838#comment:6>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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