Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932253AbXBWL5Q (ORCPT ); Fri, 23 Feb 2007 06:57:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932282AbXBWL5P (ORCPT ); Fri, 23 Feb 2007 06:57:15 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:51515 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932276AbXBWL5G (ORCPT ); Fri, 23 Feb 2007 06:57:06 -0500 Date: Fri, 23 Feb 2007 12:51:52 +0100 From: Ingo Molnar To: Evgeniy Polyakov Cc: Ulrich Drepper , linux-kernel@vger.kernel.org, Linus Torvalds , Arjan van de Ven , Christoph Hellwig , Andrew Morton , Alan Cox , Zach Brown , "David S. Miller" , Suparna Bhattacharya , Davide Libenzi , Jens Axboe , Thomas Gleixner Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 Message-ID: <20070223115152.GA2565@elte.hu> References: <20070221211355.GA7302@elte.hu> <20070221233111.GB5895@elte.hu> <45DCD9E5.2010106@redhat.com> <20070222074044.GA4158@elte.hu> <20070222113148.GA3781@2ka.mipt.ru> <20070222125931.GB25788@elte.hu> <20070222133201.GB5208@2ka.mipt.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20070222133201.GB5208@2ka.mipt.ru> User-Agent: Mutt/1.4.2.2i X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -2.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-2.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.0.3 -2.0 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 959 Lines: 23 * Evgeniy Polyakov wrote: > [...] Those 20k blocked requests were created in about 20 seconds, so > roughly saying we have 1k of thread creation/freeing per second - do > we want this? i'm not sure why you mention thread creation and freeing. The syslet/threadlet code reuses already created async threads, and that is visible all around in both the kernel-space and in the user-space syslet/threadlet code. While Linux creates+destroys threads pretty damn fast (in about 10-15 usecs - which is roughly the cost of getting a single 1-byte packet through a TCP socket from one process to another, on localhost), still we dont want to create and destroy a thread per request. Ingo - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/