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Re: Output of pstree -p <pid> shows threads with different pids

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On Wed, 05 Nov 2014 18:23:05 +0000
Richard Kettlewell <rjk@greenend.org.uk> wrote:

> Adam Stanton <adamstanton1979@gmail.com> writes:
> > I ran the program pstree -p 31872 which printed the following
> > output:
> >
> > ruby(31872)─┬─{ruby}(31906)
> >             └─{ruby}(32372)
> >
> > The man page for pstree says:
> >
> > Child threads of a process are found under the parent process and
> > are shown with the process name in curly braces, e.g.
> >
> >            icecast2---13*[{icecast2}]
> >
> > (The above is different output because of the missing -p option.
> > However running pstree 31872 gives:
> >
> > ruby───2*[{ruby}]
> >
> > which suggests a ruby process running 2 ruby threads. 
> >
> > My question is, why does the -p option show the threads with
> > different pids? I would expect them to be the same (31872) as the
> > process. Running htop also shows the same results.
> 
> “-p implicitly disables compaction” according to the man page.
> 

True enough, but why are the pids different? If these are threads, then
should the pids be the same as the process?

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Thread

Output of pstree -p <pid> shows threads with different pids Adam Stanton <adamstanton1979@gmail.com> - 2014-11-05 09:44 -0800
  Re: Output of pstree -p <pid> shows threads with different pids Richard Kettlewell <rjk@greenend.org.uk> - 2014-11-05 18:23 +0000
    Re: Output of pstree -p <pid> shows threads with different pids Adam Stanton <adamstanton1979@gmail.com> - 2014-11-05 11:05 -0800
      Re: Output of pstree -p <pid> shows threads with different pids Richard Kettlewell <rjk@greenend.org.uk> - 2014-11-05 19:34 +0000
        Re: Output of pstree -p <pid> shows threads with different pids Adam Stanton <adamstanton1979@gmail.com> - 2014-11-05 11:52 -0800

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