httpd-users mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Markus Mayer <>
Subject Re: [users@httpd] finding the cause of a hung apache with 500+ child processes
Date Mon, 15 Sep 2008 18:27:18 GMT

On Monday 08 September 2008, 13:13 Eric Covener wrote:
> On Mon, Sep 8, 2008 at 7:00 AM, Markus Mayer <> wrote:
> > Does anyone have any suggestions as to how I can pinpoint this problem? 
> > Is there any way I can log requests before they are fully served by
> > apache, as this might help the next time this shows up.
> Run pstack against all the child processes you find when you have a
> hang, if you're curious about what they're doing.

This seems to work well, thank you.  Through my experimenting, I also found 
the solaris command pfiles.  This is much slower, but lists all files that a 
process has open at the time of calling.  For an apache server with 500+ 
child processes, it will unfortunately need more than an hour to go through, 
however I think after 40 or 50, I should be able to get a good idea of what's 
making it hang.

The official User-To-User support forum of the Apache HTTP Server Project.
See <URL:> for more info.
To unsubscribe, e-mail:
   "   from the digest:
For additional commands, e-mail:

View raw message