[Haskell-cafe] SMP parallelism increasing GC time dramatically

[Tom Thorne]

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 (mailto: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
> 
> 


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.haskell.org/pipermail/haskell-cafe/attachments/20111216/1458f699/attachment.htm>