Messages in this thread | | | From | Nick LeRoy <> | Subject | Re: Detecting threads vs processes with ps or /proc | Date | Fri, 6 Dec 2002 13:56:16 -0600 |
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On Friday 06 December 2002 1:48 pm, Robert Love wrote: > 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.
I was considerring doing something like this as well. From your experience, does it work reliably? Do you need to apply a small 'fudge factor' (aka VMsize.1 ~= VMsize.2)?
> It is the default behavior. Flag `-m' turns it off. > > See thread_group() and flag_threads().
I assume these are functions in the tools themselves?
> Robert Love
Thanks
-Nick
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