Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1030319AbXBZQso (ORCPT ); Mon, 26 Feb 2007 11:48:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1030324AbXBZQso (ORCPT ); Mon, 26 Feb 2007 11:48:44 -0500 Received: from relay.2ka.mipt.ru ([194.85.82.65]:45572 "EHLO 2ka.mipt.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030319AbXBZQsn (ORCPT ); Mon, 26 Feb 2007 11:48:43 -0500 Date: Mon, 26 Feb 2007 19:46:18 +0300 From: Evgeniy Polyakov To: Ingo Molnar Cc: Davide Libenzi , Linux Kernel Mailing List , Linus Torvalds , Arjan van de Ven , Christoph Hellwig , Andrew Morton , Alan Cox , Ulrich Drepper , Zach Brown , "David S. Miller" , Suparna Bhattacharya , Jens Axboe , Thomas Gleixner Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3 Message-ID: <20070226164618.GA22454@2ka.mipt.ru> References: <20070225194645.GB1353@2ka.mipt.ru> <20070225195308.GC15681@elte.hu> <20070226081655.GA25280@elte.hu> <20070226092545.GA4110@2ka.mipt.ru> <20070226095547.GA9485@elte.hu> <20070226103319.GA24284@2ka.mipt.ru> <20070226103517.GA17195@elte.hu> <20070226104748.GC24284@2ka.mipt.ru> <20070226125123.GA31357@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20070226125123.GA31357@elte.hu> User-Agent: Mutt/1.5.9i X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-3.0 (2ka.mipt.ru [0.0.0.0]); Mon, 26 Feb 2007 19:46:59 +0300 (MSK) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1642 Lines: 45 On Mon, Feb 26, 2007 at 01:51:23PM +0100, Ingo Molnar (mingo@elte.hu) wrote: > > * Evgeniy Polyakov 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 - 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/