Re: 2.5.46-mm2

From: Albert D. Cahalan (
Date: Sun Nov 10 2002 - 23:37:25 EST

William Lee Irwin III writes:
> 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.

The feature is both buggy (both false consolidation and failure
to consolidate) and slow. While I do eventually need to add the
feature, I'm not doing so until it can be implemented properly.
So go ahead and enjoy procps-3.1.0 without it:

Future-compatibility exists. The "m" and "-m" options are currently
ignored so that you may use them in scripts without causing errors.

Um, BTW, don't we need /proc/42/threads/123/stat and friends
before the Linux 2.6.xx release? Without them, the new clone
flags supposedly let a user hide a task. That's really bad.

> 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.

Not that procps will ever be fast, but 3.1.0 is a lot faster
than 2.x.xx is. Five out of the last seven releases have
included performance improvements, and more are coming.

You also get IO-wait info in vmstat. Upgrade today! :-)
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This archive was generated by hypermail 2b29 : Fri Nov 15 2002 - 22:00:21 EST