From: Eric Wong <normalperson-rMlxZR9MS24@public.gmane.org>
To: Rainbows! list <rainbows-talk-GrnCvJ7WPxnNLxjTenLetw@public.gmane.org>
Subject: Re: Page request roundtrip time increases substantially after a bit of use
Date: Tue, 25 Jan 2011 02:02:25 +0000 [thread overview]
Message-ID: <20110125020225.GA7932@dcvr.yhbt.net> (raw)
In-Reply-To: <443004.19531.qm-9Fhxc66Fx5iB9c0Qi4KiSlZ8N9CAUha/QQ4Iyu8u01E@public.gmane.org>
chris mckenzie <kristopolous-/E1597aS9LQAvxtiuMwx3w@public.gmane.org> wrote:
> Hi Eric,
>
> I'll prepare a more formal response in a bit, but here is my test run:
> rainbows -c config.rb rackup.ru
Thanks, I'm trying to reproduce it now. Are you able to reproduce it
more quickly by throwing some ab or httperf runs in the mix to make more
requests? Reducing worker_processes usually help reproduce issues more
quickly, too, especially if it's a resource leak.
> The memory footprint remained flat.
> The CPU usage did not spike noticeably
> netstat -an did reveal some CLOSE_WAIT values on the ports but nothing that
> hadn't previously been pointed out.
Also, do you have any iptables/firewall/QoS settings on that machine
that could be interfering?
I haven't noticed anything in CLOSE_WAIT since I started testing it a
few minutes ago. Maybe it takes longer, but CLOSE_WAIT has always been
a rarity to see in my years of working with TCP client/servers...
> The (CSV) output of the test can be seen here:
> http://qaa.ath.cx/single-request.csv.gz
Just covering all my bases here, you don't have a super slow
disk/filesystem that bogs down your entire system once your logs grow to
a certain size, right?
> For those of you without any visualization software, I made a rudimentary graph
> from the data here:
>
> http://qaa.ath.cx/single-request.png
>
> You can clearly see how the delay increases and then doesn't ever go back down
> to previous levels.
Very strange.
I'm testing on my 32-bit machine with ruby 1.8.7 (2010-12-23 patchlevel
330) [i686-linux] straight off of ruby-lang.org . I usually use
Rainbows! with 1.9.2-p136 and will try that if I can reproduce the bug
under 1.8.7, too.
> I'll research answers to your previous questions now. Thanks for looking into
> this!
Alright, thanks!
--
Eric Wong
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next prev parent reply other threads:[~2011-01-25 3:33 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-24 21:03 Page request roundtrip time increases substantially after a bit of use chris mckenzie
[not found] ` <571697.98064.qm-oNR6tK37MtiB9c0Qi4KiSlZ8N9CAUha/QQ4Iyu8u01E@public.gmane.org>
2011-01-24 21:54 ` Eric Wong
[not found] ` <20110124215440.GA25489-yBiyF41qdooeIZ0/mPfg9Q@public.gmane.org>
2011-01-25 0:11 ` Eric Wong
[not found] ` <20110125001107.GA1921-yBiyF41qdooeIZ0/mPfg9Q@public.gmane.org>
2011-01-25 1:14 ` chris mckenzie
[not found] ` <443004.19531.qm-9Fhxc66Fx5iB9c0Qi4KiSlZ8N9CAUha/QQ4Iyu8u01E@public.gmane.org>
2011-01-25 2:02 ` Eric Wong [this message]
2011-01-25 2:55 ` chris mckenzie
[not found] ` <288407.18061.qm-oNR6tK37MtiB9c0Qi4KiSlZ8N9CAUha/QQ4Iyu8u01E@public.gmane.org>
2011-01-25 3:50 ` Eric Wong
[not found] ` <20110125035048.GA8124-yBiyF41qdooeIZ0/mPfg9Q@public.gmane.org>
2011-01-25 21:38 ` Eric Wong
[not found] ` <20110125213835.GA9421-yBiyF41qdooeIZ0/mPfg9Q@public.gmane.org>
2011-02-03 2:54 ` Eric Wong
[not found] ` <20110203025415.GA3812-yBiyF41qdooeIZ0/mPfg9Q@public.gmane.org>
2011-02-03 4:44 ` chris mckenzie
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