Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 23 Oct 2002 18:23:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 23 Oct 2002 18:23:44 -0400 Received: from mtao-m02.ehs.aol.com ([64.12.52.8]:58862 "EHLO mtao-m02.ehs.aol.com") by vger.kernel.org with ESMTP id ; Wed, 23 Oct 2002 18:23:41 -0400 Date: Wed, 23 Oct 2002 15:29:48 -0700 From: John Gardiner Myers Subject: Re: async poll In-reply-to: To: Davide Libenzi Cc: linux-aio , linux-kernel Message-id: <3DB722DC.3090306@netscape.com> MIME-version: 1.0 Content-type: multipart/signed; boundary=------------ms020109060809030804010401; micalg=sha1; protocol="application/x-pkcs7-signature" X-Accept-Language: en-us, en User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.2b) Gecko/20021016 References: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 6786 Lines: 111 This is a cryptographically signed message in MIME format. --------------ms020109060809030804010401 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Davide Libenzi wrote: >We're again looping talking about threads and fd being bounced between >threads. It seems that we've very different opinions about the use of >threads and how server applications should be designed. IMHO if you're >thinking of bouncing fds among threads for their handling you're doing >something somehow wrong, but this is just my opinion ... > Again, it comes down to whether or not one has the luxury of being able to (re)write one's application and supporting libraries from scratch. If one can ensure that the code for handling an event will never block for any significant amount of time, then single-threaded process-per-CPU will most likely perform best. If, on the other hand, the code for handling an event can occasionally block, then one needs a thread pool in order to have reasonable latency. A thread pool based server that is released will trivially outperform a single threaded server that needs a few more years development to convert all the blocking calls to use the event subsystem. --------------ms020109060809030804010401 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIK7TCC A4UwggLuoAMCAQICAlvfMA0GCSqGSIb3DQEBBAUAMIGTMQswCQYDVQQGEwJVUzELMAkGA1UE CBMCQ0ExFjAUBgNVBAcTDU1vdW50YWluIFZpZXcxGzAZBgNVBAoTEkFtZXJpY2EgT25saW5l IEluYzEZMBcGA1UECxMQQU9MIFRlY2hub2xvZ2llczEnMCUGA1UEAxMeSW50cmFuZXQgQ2Vy dGlmaWNhdGUgQXV0aG9yaXR5MB4XDTAyMDYwMTIwMjIyM1oXDTAyMTEyODIwMjIyM1owfTEL MAkGA1UEBhMCVVMxGzAZBgNVBAoTEkFtZXJpY2EgT25saW5lIEluYzEXMBUGCgmSJomT8ixk AQETB2pnbXllcnMxIzAhBgkqhkiG9w0BCQEWFGpnbXllcnNAbmV0c2NhcGUuY29tMRMwEQYD 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