[Ace-users] Multiple Processes in One Application

[rabryn]

On Feb 20, 2:42 pm, schm... at dre.vanderbilt.edu (Douglas C. Schmidt)
wrote:
> Hi Rabryn,
>
>
>
> >I'm executing my application (emman) on two different architectures.
> >The first being an x86 and the second is ARM9.  By executing a ps -eLf
> >| grep 'emman' on the x86 architecture I get the following...
>
> >developer at debian:~$ ps -eLf | grep 'emman'
> >1000     32084 26745 32084  0    3 23:32 pts/2    00:00:00 ./obj/emman
> >-c svc.conf
> >1000     32084 26745 32087  0    3 23:32 pts/2    00:00:00 ./obj/emman
> >-c svc.conf
> >1000     32084 26745 32088  0    3 23:32 pts/2    00:00:00 ./obj/emman
> >-c svc.conf
> >1000     32295 32098 32295  0    1 23:39 pts/4    00:00:00 grep emman
> >developer at debian:~$
>
> >I agree in this scenario you can see the process ID of the emman app
> >is 32084 and each thread has it's own LWP (32084, 32087, 32088).
> >However, when I execute the same application on the ARM9 architecture
> >I get the following...
>
> >root at sbc_23ba:~# ps -eLf | grep 'emman'
> >root      1750  1690  1750 15    1 14:03 pts/0    00:00:00 /root/emman
> >-c /root/svc.conf
> >root      1751  1750  1751  0    1 14:03 pts/0    00:00:00 /root/emman
> >-c /root/svc.conf
> >root      1754  1751  1754  0    1 14:03 pts/0    00:00:00 /root/emman
> >-c /root/svc.conf
> >root      1755  1751  1755  0    1 14:03 pts/0    00:00:00 /root/emman
> >-c /root/svc.conf
> >root      1757  1715  1757  0    1 14:03 pts/2    00:00:00 grep emman
> >root at sbc_23ba:~#
>
> >Ignoring the fact that there is an extra entry (I can't explain that
> >either!) you can see there are distinct process IDs for each thread
> >with a matching LWP ID.  Both architectures are using ACE 5.5.10 and
> >were compiled with the same configuration.  I understand this may be a
> >Linux question, or even an ARM9 gcc question, but any ideas you may
> >have would be greatly appreciated.
>
> This is definitely a Linux/ARM9 question, not an ACE question ;-)
>
> Thanks,
>
>         Doug
> --
> Dr. Douglas C. Schmidt                       Professor and Associate Chair
> Electrical Engineering and Computer Science  TEL: (615) 343-8197
> Vanderbilt University                        WEB:www.dre.vanderbilt.edu/~schmidt
> Nashville, TN 37203                          NET: d.schm... at vanderbilt.edu

All,

I realized my problem.  I'm using an older glibc that implements
LinuxThreads which uses a "one process per thread" model.  If I
upgrade to a more recent glibc that supports NPTL I would see one
process with multiple threads.

Thanks,
rabryn