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From: Michael Fischer <mfischer@zendesk.com>
To: Sarkis Varozian <svarozian@gmail.com>
Cc: unicorn-public <unicorn-public@bogomips.org>
Subject: Re: Request Queueing after deploy + USR2 restart
Date: Tue, 3 Mar 2015 14:32:04 -0800	[thread overview]
Message-ID: <CABHxtY6Hjpx1y0iXBTDJXbgWpihaZxho1B=CAk+kF8PL2BbCGQ@mail.gmail.com> (raw)
In-Reply-To: <CAGchx-+qiqGzEW3PWiOgJPQtk6HfdP-t0iohYnXft14zFE7Brg@mail.gmail.com>

If the response times are falling a minute or so after the reload, I'd
chalk it up to a cold CPU cache.  You will probably want to stagger your
reloads across backends to minimize the impact.

--Michael

On Tue, Mar 3, 2015 at 2:24 PM, Sarkis Varozian <svarozian@gmail.com> wrote:

> We have a rails application with the following unicorn.rb:
> http://goo.gl/qZ5NLn
>
> When we deploy to the application, a USR2 signal is sent to the unicorn
> master which spins up a new master and we use the before_fork in the
> unicorn.rb config above to send signals to the old master as the new
> workers come online.
>
> I've been trying to debug a weird issue that manifests as "Request
> Queueing" in our Newrelic APM. The graph shows what happens after a
> deployment (represented by the vertical lines). Here is the graph:
> http://goo.gl/iFZPMv . As you see from the graph, it is inconsistent -
> there is always a latency spike - however, at times Request Queueing is
> higher than previous deploys.
>
> Any ideas on what exactly is going on here? Any suggestions on
> tools/profilers to use to get to the bottom of this? Should we expect this
> to happen on each deploy?
>
> Thanks,
>
> --
> *Sarkis Varozian*
> svarozian@gmail.com
>
>
>




  reply	other threads:[~2015-03-03 22:32 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-03-03 22:24 Sarkis Varozian
2015-03-03 22:32 ` Michael Fischer [this message]
2015-03-04 19:48   ` Sarkis Varozian
2015-03-04 19:51     ` Michael Fischer
2015-03-04 19:58       ` Sarkis Varozian
2015-03-04 20:17         ` Michael Fischer
2015-03-04 20:24           ` Sarkis Varozian
2015-03-04 20:27             ` Michael Fischer
2015-03-04 20:35             ` Eric Wong
2015-03-04 20:40               ` Sarkis Varozian
2015-03-05 17:07                 ` Sarkis Varozian
2015-03-05 17:13                   ` Bráulio Bhavamitra
2015-03-05 17:28                     ` Sarkis Varozian
2015-03-05 17:31                       ` Bráulio Bhavamitra
2015-03-05 17:32                       ` Bráulio Bhavamitra
2015-03-05 21:12                       ` Eric Wong
2015-03-03 22:47 ` Bráulio Bhavamitra
2015-03-04 19:50   ` Sarkis Varozian
     [not found] ` <CAJri6_vidE15Xor4THzQB3uxyqPdApxHoyWp47NAG8m8TQuw0Q@mail.gmail.com>
2015-09-13 15:12   ` Bráulio Bhavamitra
2015-09-14  2:14     ` Eric Wong

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