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From "Paul J. Reder" <rede...@raleigh.ibm.com>
Subject Re: No processes left after big AB test
Date Thu, 12 Apr 2001 13:42:44 GMT
Greg Ames wrote:
> 
> "Paul J. Reder" wrote:
> 
> > By the way, when I start Apache then run ps -efH (with no server load) I get something
like
> > webadmin 21803     1  0 10:07 pts/3    00:00:00   httpd -d /home/webadmin/Apache
  (1 top level Apache)
> > webadmin 21805 21803  0 10:07 pts/3    00:00:00     httpd -d /home/webadmin/Apac
  (Start_Server number of these)
> > webadmin 21808 21805  0 10:07 pts/3    00:00:00       httpd -d /home/webadmin/Ap
  (1 per Start_server)
> > webadmin 21809 21808  0 10:07 pts/3    00:00:00         httpd -d /home/webadmin/
  (threads_per_Child number of these
> > webadmin 21812 21808  0 10:07 pts/3    00:00:00         httpd -d /home/webadmin/
             -
> > webadmin 21815 21808  0 10:07 pts/3    00:00:00         httpd -d /home/webadmin/
              -
> > webadmin 21818 21808  0 10:07 pts/3    00:00:00         httpd -d /home/webadmin/
               -
> >
> > I understand 21803 and I understand 21809 and its ilk. I also understand either
21805 or 21808
> > but not both. What am I missing in the way that processes and threads are handled
in APR/threaded mpm?
> >
> 
> I hacked up apr/test/testthread.c so that the threads sleep for several
> seconds before exiting.  This program creates 4 threads via
> apr_thread_create.  When all 4 are sleeping, I see:
> 
> [gregames@gandalf httpd-2.0]$ ps ax -HO ppid,wchan | grep testthread
>  3306  1152 rt_sig S pts/0    00:00:00       ./testthread
>  3307  3306 do_pol S pts/0    00:00:00         ./testthread
>  3308  3307 nanosl S pts/0    00:00:00           ./testthread
>  3309  3307 nanosl S pts/0    00:00:00           ./testthread
>  3310  3307 nanosl S pts/0    00:00:00           ./testthread
>  3311  3307 nanosl S pts/0    00:00:00           ./testthread
> 
> ...so it looks like Linux is creating an extra thread/process for us
> (3307), probably when we do first pthread_create.
> 
> Greg

And according to my tests it is 3307 that is exiting / becoming defunct and leaving the
worker threads orphaned. No core file, no log, no nothing...

-- 
Paul J. Reder
-----------------------------------------------------------
"The strength of the Constitution lies entirely in the determination of each
citizen to defend it.  Only if every single citizen feels duty bound to do
his share in this defense are the constitutional rights secure."
-- Albert Einstein

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