From: Eric Wong <normalperson@yhbt.net>
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: A barrage of unexplained timeouts
Date: Tue, 20 Aug 2013 20:42:44 +0000 [thread overview]
Message-ID: <20130820204244.GA3846@dcvr.yhbt.net> (raw)
In-Reply-To: <1377029010.22657225@apps.rackspace.com>
nick@auger.net wrote:
> "Eric Wong" <normalperson@yhbt.net> said:
> > This is really strange. This was only really bad for a 7s period?
>
> It was a 7 minute period. All of the workers would become busy and
> exceed their >120s timeout. Master would kill and re-spawn them,
> they'd start to respond to a handful of requests (anywhere from 5-50)
> after which they'd become "busy" again, and get force killed by
> master. This pattern happened 3 times over a 7 minute period.
>
> > Has it happened again?
>
> No
>
> > Anything else going on with the system at that time? Swapping,
> > particularly...
>
> No swap activity or high load. Our munin graphs indicate a peak of
> web/app server disk latency around that time, although our graphs show
> many other similar peaks, without incident.
I'm stumped :<
Do you have any background threads running that could be hanging the
workers? This is Ruby 1.8, after all, so there's more likely to be
some blocking call hanging the entire process. AFAIK, some monitoring
software runs a background thread in the unicorn worker and maybe the
OpenSSL extension doesn't work as well if it encountered network
problems under Ruby 1.8
Otherwise, I don't know...
_______________________________________________
Unicorn mailing list - mongrel-unicorn@rubyforge.org
http://rubyforge.org/mailman/listinfo/mongrel-unicorn
Do not quote signatures (like this one) or top post when replying
next prev parent reply other threads:[~2013-08-20 20:42 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-20 14:47 A barrage of unexplained timeouts nick
2013-08-20 16:37 ` Eric Wong
2013-08-20 17:27 ` nick
2013-08-20 17:40 ` Eric Wong
2013-08-20 18:11 ` nick
2013-08-20 18:49 ` Eric Wong
2013-08-20 20:03 ` nick
2013-08-20 20:42 ` Eric Wong [this message]
2013-08-20 21:19 ` nick
2013-08-20 21:32 ` Eric Wong
2013-08-21 13:33 ` nick
2013-08-22 2:32 ` Jimmy Soho
2013-08-22 4:09 ` Eric Wong
2013-08-22 13:10 ` nick
2013-08-22 17:05 ` Eric Wong
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://yhbt.net/unicorn/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130820204244.GA3846@dcvr.yhbt.net \
--to=normalperson@yhbt.net \
--cc=mongrel-unicorn@rubyforge.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://yhbt.net/unicorn.git/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).