[Bug 394350] Re: RLimitCPU has no effect in Apache

[Andrew Mitchell]

I've tested this on hardy (i386) with all updates installed. The only difference I can see at a glance is i386 vs amd64 with regards to testing this.
I've tested with the same method as Kees, in that /etc/apache2/sites-enabled/000-default has:
<VirtualHost *>
        ServerAdmin webmaster at localhost
        RLimitCPU 2 2
...

The apache2 process was restarted with /etc/init.d/apache2 restart, with the same CGI script installed.
After hitting the URL, the process is definitely running without being killed, and the limit has been set on that child process:

:0:> sudo cat /proc/2089/limits
Limit                     Soft Limit           Hard Limit           Units     
Max cpu time              2                    2                    ms        

With this, the kernel doesn't appear to be killing the process quickly,
however I suspect that this is due to system time vs CPU time - the
example given spends a fair bit of time forking processes, but once it
reaches 0:02.00 in top, the kernel kills the process, even though about
a minute of wall clock time has elapsed.

-- 
RLimitCPU has no effect in Apache
https://bugs.launchpad.net/bugs/394350
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