[Haskell-cafe] Real-time garbage collection for Haskell

Simon Cranshaw simon.cranshaw at gmail.com
Mon Mar 1 21:33:23 EST 2010

On Sun, Feb 28, 2010 at 6:06 PM, Pavel Perikov <perikov at gmail.com> wrote:

> Did you really seen 100ms pauses?! I never did extensive research on this
> but my numbers are rather in microseconds range (below 1ms). What causes
> such a long garbage collection? Lots of allocated and long-living objects?
I am using an automated options trading system written in Haskell.  I'm more
on the business side than the technical side of the issues so I'm not clear
on all the details.  I can confirm that without tweaking the RTS settings we
were seeing over 100ms GC pauses.  I've mainly been trying to minimise our
overall response time and we were able to improve this by increasing the
allocation area with -A.  I think this brought GC well under 100ms.  We are
still working on analysis of this.

I can also confirm, as others seem to have found, that under 6.12 the
parallel GC seemed to make things much worse. I am always turning it off
with -qg.  If there is a project to improve performance of the GC I could be
interested to contribute.

Simon Cranshaw
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