Donald Bruce Stewart wrote:
szefirov:
From GHC documentation: "Once profiling has thrown the spotlight on the
guilty time-consumer(s), it may be better to re-think your program than
to try all the tweaks listed below."
So, how should I rethink my program? Which way to take?
Do you have some particular code that is underperforming?
I have a plenty of it. ;)
I'm yet to decide what to blame.
Performance tips are documented here:
http://haskell.org/haskellwiki/Performance
Thank you. I loaded it the next second I received your answer. ;)
I profiled my program and found that residency looks pretty fixed but
program memory usage grows and eventually I get heap overflow (on
Windows) or heavy pagefile trashing (on Linux).
When I turn on +RTS -c to use heap compaction I immediately get the
following:
-----------------------------
xxxx.exe: internal error: scavenge_mark_stack: unimplemented/strange
closure type 30 @ 03678268
Please report this as a bug to glasgow-haskell-bugs@haskell.org,
or http://www.sourceforge.net/projects/ghc/
-----------------------------
This already reported as a bug, but isn't fixed yet. The bug is right
here: http://cvs.haskell.org/trac/ghc/ticket/954
It does appear with 6.4.1 too.
So I try as hard as I can to reduce the size of garbage produced. No
much luck so far.
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