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From: Eric Wong <normalperson@yhbt.net>
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: Combating nginx 499 HTTP responses during flash traffic scenario
Date: Fri, 30 Nov 2012 23:47:11 +0000
Message-ID: <20121130234710.GA17300@dcvr.yhbt.net> (raw)
In-Reply-To: <20121129213017.GA925@dcvr.yhbt.net>

Eric Wong <normalperson@yhbt.net> wrote:
> Lawrence Pit <lawrence.pit@gmail.com> wrote:
> > A related question: is it possible to get insight in what's in the
> > unicorn queue and for how long requests have been queued there?

<snip>

> Using SystemTap (or similar solutions), I think the same information may
> be retrieved without modifying the Ruby process.  I'm just starting my
> exploration of SystemTap, though...

With a little help from a SystemTap maintainer, I wrote a script
to get the TCP queue times easily.

The UNIX domain socket one is still pretty fragile (comments inline) but
appears to work:

http://mid.gmane.org/20121130223518.GA13976@dcvr.yhbt.net

If you're using an older SystemTap, you may need to swap cpu_clock_*(0)
with gettimeofday_*().
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  reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-10-29 17:44 Tom Burns
2012-10-29 18:45 ` Eric Wong
2012-10-29 19:27   ` Hongli Lai
2012-10-29 19:41     ` Eric Wong
2012-10-29 21:06       ` Hongli Lai
2012-10-29 21:53   ` Eric Wong
2012-10-29 22:21     ` Tom Burns
2012-10-30 20:40     ` Tom Burns
2012-10-30 21:37       ` Eric Wong
2012-11-02 17:59         ` Tom Burns
2012-11-02 19:38           ` Eric Wong
2012-11-03 22:45             ` Tom Burns
2012-11-05 11:48               ` Eric Wong
2012-11-06  3:16                 ` Tom Burns
2012-11-06 21:23                   ` Eric Wong
2012-11-29 15:52                     ` Tom Burns
2012-11-29 20:30                       ` Lawrence Pit
2012-11-29 20:57                         ` Tom Burns
2012-11-29 21:30                         ` Eric Wong
2012-11-30 23:47                           ` Eric Wong [this message]
2012-11-29 20:41                       ` Eric Wong
2012-12-04  3:00                         ` Eric Wong
2012-11-29 21:19                       ` Eric Wong
2012-11-29 21:55                         ` [RFC/PATCH] check_client_connection: document local-only requirement Eric Wong
2012-11-29 23:47                           ` Tom Burns

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