From: ghazel@gmail.com
To: unicorn list <mongrel-unicorn@rubyforge.org>
Subject: Re: listen backlog
Date: Thu, 2 Dec 2010 21:31:24 -0800 [thread overview]
Message-ID: <AANLkTim_9Umq+08_SRn8D3HD3=2V4_jsd0nALANWyK07@mail.gmail.com> (raw)
In-Reply-To: <20101203023919.GA4411@dcvr.yhbt.net>
On Thu, Dec 2, 2010 at 6:39 PM, Eric Wong <normalperson@yhbt.net> wrote:
> ghazel@gmail.com wrote:
>> I found this thread
>> http://rubyforge.org/pipermail/mongrel-unicorn/2009-September/000031.html
>> after googling for the same error located in my nginx error log.
>>
>> Is there some way to discover the current queue length of the backlog?
>> Increasing the maximum size to 2048 "worked" for me as well, but
>> obviously clients sit in the queue for a long time. If I could monitor
>> queue length I could get some idea of when I have insufficient unicorn
>> workers before the delay gets very high or requests fail.
>
> If you're using Linux, you can use Raindrops[1] to interrogate
> via inet_diag or parse /proc/net/{tcp,unix} yourself.
>
> You can run Raindrops separate/standalone script:
> http://git.bogomips.org/cgit/raindrops.git/tree/examples/linux-tcp-listener-stats.rb
>
> Or use it as middleware (see webpage):
> http://raindrops.bogomips.org/
>
> git clone git://git.bogomips.org/raindrops
Amazing! I had somehow never heard of it. I use a unix socket for
unicorn (should I not?) so I had to make a copy of
linux-tcp-listener-stats.rb to support that. Now I'm able to get stats
for my unicorn master.
However, there seems to be some problem getting stats on TCP sockets:
$ ruby linux-tcp-listener-stats.rb 127.0.0.1:9000
address active queued
linux-tcp-listener-stats.rb:42:in `tcp_listener_stats': Connection
refused - sendmsg (Errno::ECONNREFUSED)
from linux-tcp-listener-stats.rb:42
$ grep 0100007F:2328 /proc/net/tcp
1: 0100007F:2328 00000000:0000 0A 00000000:00000000 00:00000000
00000000 500 0 25307310 1 ffff880134471700 3000 0 0 2 -1
None of the TCP sockets I know to exist seem to work - they all fail
with that error.
Any ideas?
-Greg
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next prev parent reply other threads:[~2010-12-03 6:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-03 1:35 listen backlog ghazel
2010-12-03 2:39 ` Eric Wong
2010-12-03 5:31 ` ghazel [this message]
2010-12-03 7:35 ` Eric Wong
2010-12-03 9:16 ` ghazel
2010-12-03 21:49 ` Eric Wong
2010-12-03 22:49 ` ghazel
2010-12-04 23:48 ` Eric Wong
2010-12-05 0:02 ` ghazel
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