Re: 2.5.46-mm2

[Toon van der Pas <toon@hout.vanvergehaald.nl>]

On Sun, Nov 10, 2002 at 09:11:30AM -0800, William Lee Irwin III wrote:
> William Lee Irwin III wrote:
> >> Go for it, I'm just trying to get tiobench to actually run (seems to
> >> have new/different "die from too many threads" behavior wrt. --threads).
> >> Dropping me a fresh kernel shouldn't slow anything down.
> 
> On Sun, Nov 10, 2002 at 08:58:28AM -0800, Andrew Morton wrote:
> > It could be the procps thing?  `tiobench --threads 256' shows up as a
> > single process in top and ps due to the new thread consolidation feature.
> > If you run `ps auxm' or hit 'H' in top, all is revealed.  Not my fave
> > feature that.
> 
> Turns out monitoring things via /proc/ slowed it down by some ridiculous
> factor while it was trying to spawn threads. 9 hours became less than 1s
> when I stopped looking.

Ah!
You just rediscovered the strange world of quantum physics:
the result of your experiment depends on wether you're looking or not.

:-)

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