linux-kernel - Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

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Date:	Thu, 1 Mar 2007 18:47:08 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Pavel Machek <pavel@....cz>,
	Theodore Tso <tytso@....edu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ulrich Drepper <drepper@...hat.com>,
	linux-kernel@...r.kernel.org,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Zach Brown <zach.brown@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

On Thu, Mar 01, 2007 at 04:32:37PM +0100, Eric Dumazet (dada1@...mosbay.com) wrote:
> On Thursday 01 March 2007 16:23, Evgeniy Polyakov wrote:
> > They are there, since ab runs only 50k requests.
> > If I change it to something noticebly more than 50/80k, ab crashes:
> > # ab -c8000 -t 600 -n800000000 http://192.168.0.48/
> > This is ApacheBench, Version 2.0.40-dev <$Revision: 1.146 $> apache-2.0
> > Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
> > Copyright 2006 The Apache Software Foundation, http://www.apache.org/
> >
> > Benchmarking 192.168.0.48 (be patient)
> > Segmentation fault
> >
> > Are there any other tool suitable for such loads?
> > I only tested httperf (which is worse, since it uses poll/select) and
> > 'ab'.
> >
> > Btw, host machine runs 100% too, so it is possible that client side is
> > broken (too).
> 
> I have similar problems here, ab test just doesnt complete...
> 
> I am still investigating with strace and tcpdump.
> 
> In the meantime you could just rewrite it (based on epoll please :) ), since 
> it should be quite easy to do this (reverse of evserver_epoll)

Rewriting 'ab' with pure epoll instead of APR lib is like
dandruff treatment on a guillotine.

I will try to cook up something own - simple client (based on epoll)
tomorrow/weekend, now I need to work for money :)

-- 
	Evgeniy Polyakov
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