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

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Date:	Mon, 26 Feb 2007 19:46:18 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Davide Libenzi <davidel@...ilserver.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.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>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

On Mon, Feb 26, 2007 at 01:51:23PM +0100, Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Evgeniy Polyakov <johnpol@....mipt.ru> wrote:
> 
> > Even having main dispatcher as epoll/kevent loop, the _whole_ 
> > threadlet model is absolutely micro-thread in nature and not state 
> > machine/event.
> 
> Evgeniy, i'm not sure how many different ways to tell this to you, but 
> you are not listening, you are not learning and you are still not 
> getting it at all.
> 
> The scheduler /IS/ a generic work/event queue. And it's pretty damn 
> fast. No amount of badmouthing will change that basic fact. Not exactly 
> as fast as a special-purpose queueing system (for all the reasons i 
> outlined to you, and which you ignored), but it gets pretty damn close 
> even for the web workload /you/ identified, and offers a user-space 
> programming model that is about 1000 times more useful than 
> state-machines.

Meanwhile on practiceal side:
via epia kevent/epoll/threadlet:

client: ab -c500 -n5000 $url

kevent:		849.72
epoll:		538.16
threadlet:
 gcc ./evserver_epoll_threadlet.c -o ./evserver_epoll_threadlet
 In file included from ./evserver_epoll_threadlet.c:30:
 ./threadlet.h: In function ‘threadlet_exec’:
 ./threadlet.h:46: error: can't find a register in class ‘GENERAL_REGS’
 while reloading ‘asm’

That particular asm optimization fails to compile.

> 	Ingo

-- 
	Evgeniy Polyakov
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