From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on dcvr.yhbt.net X-Spam-Level: X-Spam-ASN: AS31976 209.132.176.0/21 X-Spam-Status: No, score=-3.5 required=3.0 tests=AWL,BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MSGID_FROM_MTA_HEADER,RP_MATCHES_RCVD shortcircuit=no autolearn=ham autolearn_force=no version=3.4.0 From: Andy Whitcroft Subject: Re: cloning the kernel - why long time in "Resolving 313037 deltas" Date: Tue, 19 Dec 2006 10:24:29 +0000 Message-ID: <4587BDDD.5030508@shadowen.org> References: <86y7p57y05.fsf@blue.stonehenge.com> <86r6uw9azn.fsf@blue.stonehenge.com> <86hcvs984c.fsf@blue.stonehenge.com> <8664c896xv.fsf@blue.stonehenge.com> <20061219051108.GA29405@thunk.org> <7v1wmwtfmk.fsf@assigned-by-dhcp.cox.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit NNTP-Posting-Date: Tue, 19 Dec 2006 10:57:58 +0000 (UTC) Cc: Johannes Schindelin , Theodore Tso , Nicolas Pitre , "Randal L. Schwartz" , git@vger.kernel.org Return-path: Envelope-to: gcvg-git@gmane.org X-Greylist: delayed 1988 seconds by postgrey-1.27 at vger.kernel.org; Tue, 19 Dec 2006 05:57:43 EST User-Agent: Icedove 1.5.0.8 (X11/20061116) In-Reply-To: <7v1wmwtfmk.fsf@assigned-by-dhcp.cox.net> Precedence: bulk X-Mailing-List: git@vger.kernel.org Archived-At: Received: from vger.kernel.org ([209.132.176.167]) by ciao.gmane.org with esmtp (Exim 4.43) id 1GwcfK-0006qj-Pi for gcvg-git@gmane.org; Tue, 19 Dec 2006 11:57:48 +0100 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932782AbWLSK5o (ORCPT ); Tue, 19 Dec 2006 05:57:44 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932789AbWLSK5o (ORCPT ); Tue, 19 Dec 2006 05:57:44 -0500 Received: from hellhawk.shadowen.org ([80.68.90.175]:4246 "EHLO hellhawk.shadowen.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932782AbWLSK5n (ORCPT ); Tue, 19 Dec 2006 05:57:43 -0500 Received: from localhost ([127.0.0.1]) by hellhawk.shadowen.org with esmtp (Exim 4.50) id 1Gwc8F-0002T9-9d; Tue, 19 Dec 2006 10:23:35 +0000 To: Junio C Hamano Sender: git-owner@vger.kernel.org Junio C Hamano wrote: > Johannes Schindelin writes: > >> Hi, >> >> in a very unscientific test, without your patch local cloning of the >> LilyPond repo takes 1m33s (user), and with your patch (pread() instead of >> mmap()) it takes 1m13s (user). The real times are somewhat bogus, but >> still in favour of pread(), but only by 8 seconds instead of 20. >> >> This is on Linux 2.4.32. > > Interesting. Anybody have numbers from 2.6? On my debian etch system: Linux version 2.6.17-2-686 (Debian 2.6.17-9) (waldi@debian.org) (gcc version 4.1.2 20060901 (prerelease) (Debian 4.1.1-13)) #1 SMP Wed Sep 13 16:34:10 UTC 2006 I did one run first (not included) to get things nice and warm, then three runs of each. Overall the same as reported elsewhere marginally better with pread(). I guess you could say a 20-30% improvement in system time which isn't to be sniffed at. -apw mmap(): real 1m5.187s user 1m0.844s sys 0m2.900s real 1m6.748s user 1m0.868s sys 0m3.064s real 1m5.604s user 1m0.760s sys 0m3.124s pread(): real 1m4.676s user 1m0.168s sys 0m2.340s real 1m3.563s user 0m59.796s sys 0m2.248s real 1m4.066s user 1m0.156s sys 0m2.304s