Messages in this thread | | | Subject | Re: Detecting threads vs processes with ps or /proc | From | Robert Love <> | Date | 06 Dec 2002 14:48:33 -0500 |
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On Fri, 2002-12-06 at 10:24, Nick LeRoy wrote:
> >From what else I've read, it seems that the new threading model in 2.5/2.6 is > changing to a more POSIX friendly model, which will effect this answer, but > we're not running 2.5 and really can't force such an upgrade -- hell, right > now we're having problems getting a switch from 2.2 pushed through.
Yep, you should get what you want with 2.5 + NPTL. We need to add a few bits, though, to make it complete.
> Thanks _very_ much in advance. I'd be tickled pink if the answer is something > like "just look at the foo flag in ps", or "upgrade to version 1.2.3.4 of > procps and do xyzzy", but my intuition tells me otherwise.
See http://tech9.net/rml/procps
and "upgrade to version 2.0.8 or later of procps" :)
It is just a heuristic, though. A hack in fact. We look at a process's children and compare RSS, VM size, and the process image they are running. If they are the same, we label them threads.
It is the default behavior. Flag `-m' turns it off.
See thread_group() and flag_threads().
Robert Love
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