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

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Message-ID: <20070226193054.GB17892@2ka.mipt.ru>
Date:	Mon, 26 Feb 2007 22:30:59 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, 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 Mon, Feb 26, 2007 at 11:22:46AM -0800, Linus Torvalds (torvalds@...ux-foundation.org) wrote:
> See? Stop blathering about how everything is an event. THAT'S NOT 
> RELEVANT. I've told you a hundred times - they may be "logically 
> equivalent", but that doesn't change ANYTHING. Event-based programming 
> simply isn't suitable for 99% of all stuff, and for the 1% where it *is* 
> suitable, it actually tends to be a very specific subset of the code that 
> you actually use events for (ie accept and read/write on pure streams).

Will you argue that people do things like
num = epoll_wait()
for (i=0; i<num; ++i) {
	process(event[i])?
}

Will you spawn thread per IO?

Stop writing the same again and again - I perfectly understand that not
everything can be easily covered by events, but covering everything with
threads is more stupid idea.

High-performance IO requires as small as possible overhead, dispatching
events from ring buffer or queue from each cpu is the smallest one, but
not spawning a thread per read.

> 		Linus

-- 
	Evgeniy Polyakov
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