Thanks Russell and Dan, the following are the output that you need.

[root@db03b04 ~]# cat 5174.txt
restart_syscall(<... resuming interrupted call ...>) = 0
kill(5173, SIG_0)                       = 0
kill(6099, SIG_0)                       = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], SA_RESTORER, 0x7f9827095500}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, 0x7f97ebffcb80)       = 0
kill(5173, SIG_0)                       = 0
kill(6099, SIG_0)                       = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], SA_RESTORER, 0x7f9827095500}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, 0x7f97ebffcb80)       = 0
kill(5173, SIG_0)                       = 0
kill(6099, SIG_0)                       = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], SA_RESTORER, 0x7f9827095500}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, 0x7f97ebffcb80)       = 0
kill(5173, SIG_0)                       = 0
kill(6099, SIG_0)                       = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0
rt_sigaction(SIGCHLD, NULL, {SIG_DFL, [], SA_RESTORER, 0x7f9827095500}, 8) = 0
rt_sigprocmask(SIG_SETMASK, [], NULL, 8) = 0
nanosleep({2, 0}, 0x7f97ebffcb80)       = 0
kill(5173, SIG_0)                       = 0
kill(6099, SIG_0)                       = 0
rt_sigprocmask(SIG_BLOCK, [CHLD], [], 8) = 0

[root@db03b04 ~]# ls -l /proc/5174/exe
lrwxrwxrwx 1 nova nova 0 Dec 19 01:27 /proc/5174/exe -> /usr/bin/python

Thanks,

Guangya

From:	Dan Smith <dansmith@redhat.com>
To:	Russell Bryant <rbryant@redhat.com>, Perry Myers <pmyers@redhat.com>, Guang Ya GY Liu/China/IBM@IBMCN, rdo-list <rdo-list@redhat.com>
Date:	2013/12/20 02:46
Subject:	Re: [rhos-list] RDO problem

---

> nova-compute spawns child processes, but not to run multiple instances
> of nova-compute itself.
>
> Perhaps it's just something inaccurate with the process list where the
> command part didn't get updated... not sure.  In this case 6099 is the
> normal parent nova-compute.  The others are suspect.
>
> Can you grab an strace log from them?  Something like ...
>
> # strace -p 5174 -o 5174.txt

Also do this, which might be more obvious if it's what we think it is:

ls -l /proc/5174/exe

--Dan