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From Greg Ames <grega...@remulak.net>
Subject Re: No processes left after big AB test
Date Wed, 11 Apr 2001 23:11:02 GMT
"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

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