[Haskell-cafe] SMP parallelism increasing GC time dramatically

Mikolaj Konarski mikolaj.konarski at gmail.com
Mon Jan 9 18:22:57 CET 2012

Tom, thank you very much for the ThreadScope feedback.
Anything new? Anybody? We are close to a new release,
so that's the last call for bug reports before the release.
Stay tuned. :)

On Fri, Dec 16, 2011 at 11:34, Tom Thorne <thomas.thorne21 at gmail.com> wrote:
> Hi,
> I can't remember if it was threadscope that crashed or the RTS, since I was
> also having segfaults in the RTS because of this bug, that is fixed in
> 7.2.2: http://hackage.haskell.org/trac/ghc/ticket/5552
> I successfully used threadscope by running my code for fewer iterations to
> produce a smaller log, and it was helpful to make sure I was dividing work
> equally between the threads.
> I think I still have the log file that was about 1.8GB so I will try running
> threadscope on it and see what happens.
> The performance problems I was having turned out to be fixed completely by
> changing the GC options passed to the RTS.
> thanks!
> Tom
> On Friday, 16 December 2011 at 09:20, Mikolaj Konarski wrote:
> On Mon, Oct 10, 2011 at 15:55, Tom Thorne <thomas.thorne21 at gmail.com> wrote:
> Yes I will try to run threadscope on it, I tried it before and the event log
> output produced about 1.8GB, and then crashed.
> Hi Tom,
> I'm one of the TS/ghc-events hackers and I'd like to learn more,
> fix it or at least put it on the TS/ghc-events issue tracker
> (http://trac.haskell.org/ThreadScope). Could you help me reproduce
> the problem? Did ThreadScope crash or RTS? Which versions?
> Was it 1.8GB of the log file or RAM? Did you succeed eventually?
> Any other TS feedback?
> Thank you,
> Mikolaj

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