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From Issac Goldstand <mar...@beamartyr.net>
Subject [users@httpd] mpm_event problem on SmartOS
Date Mon, 20 May 2013 09:53:03 GMT
Hey folks,

I've been working on a consulting gig for a company hosting on SmartOS
(which I'm admittedly pretty unfamiliar with), and have been running
into an odd issue on mpm_event.

When doing a simple load test with ab, we keep running into this pattern:

[Sun May 19 17:44:49.132658 2013] [mpm_event:notice] [pid 56832:tid 1]
AH00489: Apache/2.4.2 (Unix) configured -- resuming normal operations
[Sun May 19 17:44:49.132879 2013] [core:notice] [pid 56832:tid 1]
AH00094: Command line: '/opt/local/sbin/httpd'
[Sun May 19 17:45:10.182436 2013] [mpm_event:error] [pid 56832:tid 1]
AH00484: server reached MaxRequestWorkers setting, consider raising the
MaxRequestWorkers setting
[Sun May 19 17:48:12.955763 2013] [mpm_event:crit] [pid 57728:tid 29]
(81)File descriptor in bad state: apr_pollset_poll failed.  Attempting
to shutdown process gracefully
[Sun May 19 17:48:13.955597 2013] [mpm_event:error] [pid 56832:tid 1]
AH00485: scoreboard is full, not at MaxRequestWorkers
[Sun May 19 17:50:35.796865 2013] [mpm_event:error] [pid 56832:tid 1]
AH00485: scoreboard is full, not at MaxRequestWorkers
(...
it goes on with lots of "scoreboard is full, not at MaxRequestWorkers"
and a nice sprinkling of "(81)File descriptor in bad state:
apr_pollset_poll failed" until load goes away)

While I am able to tune the MPM up to handle more, and that seems to be
somewhat of a band-aid, I'm wondering what the root cause might be.  I'm
thinking that the "scoreboard is full, not at MaxRequestWorkers" is
because the scoreboard isn't being cleared out yet (either because of a
bug, or because the high load isn't letting Apache get to
housecleaning), but clueless as to what's causing the apr_pollset_poll
to fail in the first place and cause this downward spiral.  Anyone with
SmartOS or Solaris experience seen something like this?

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