[Haskell-cafe] Substantial (1:10??) system dependencies of runtime performance??

[Nick Rudnick]

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 <gwern0 at gmail.com>

> On Sat, Feb 2, 2013 at 3:19 PM, Nick Rudnick <nick.rudnick at 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
>
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