Hi Gwern, thanks for the interesting info. I quite often have processing of CSV file data of about 100M-1G done.
Thanks a lot, Nick 2013/2/2 Gwern Branwen <gwe...@gmail.com> > On Sat, Feb 2, 2013 at 3:19 PM, Nick Rudnick <nick.rudn...@gmail.com> > wrote: > > Roughly, I would say the differences in runtime can reach a factor as > much > > as 1:10 at many times -- and so I am curious whether this subject has > > already been observed or even better discussed elsewhere. I have spoken > to > > somebody, and our only plausible conclusion was that software like web > > browsers is able to somewhat aggressively claim system resources higher > in > > the privilege hierarchy (cache?? register??), so that they are not > available > > to other programs any more. > > Maybe the Haskell program requires a lot of disk IO? That could easily > lead to a big performance change since disk is so slow compared to > everything else these days. You could try looking with 'lsof' to see > if the browser has a ton of files open or try running the Haskell > program with higher or lower disk IO priority via 'ionice'. > > -- > gwern > http://www.gwern.net > > _______________________________________________ > Haskell-Cafe mailing list > Haskell-Cafe@haskell.org > http://www.haskell.org/mailman/listinfo/haskell-cafe >
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