From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12430 invoked by alias); 28 Aug 2003 01:35:07 -0000 Mailing-List: contact cygwin-help@cygwin.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: cygwin-owner@cygwin.com Mail-Followup-To: cygwin@cygwin.com Received: (qmail 12405 invoked from network); 28 Aug 2003 01:35:06 -0000 Received: from unknown (HELO slinky.cs.nyu.edu) (128.122.20.14) by sources.redhat.com with SMTP; 28 Aug 2003 01:35:06 -0000 Received: from slinky.cs.nyu.edu (localhost [127.0.0.1]) by slinky.cs.nyu.edu (8.12.9+Sun/8.12.9) with ESMTP id h7S1Z6mL026806; Wed, 27 Aug 2003 21:35:06 -0400 (EDT) Received: from localhost (pechtcha@localhost) by slinky.cs.nyu.edu (8.12.9+Sun/8.12.2/Submit) with ESMTP id h7S1Z5Gq026803; Wed, 27 Aug 2003 21:35:05 -0400 (EDT) X-Authentication-Warning: slinky.cs.nyu.edu: pechtcha owned process doing -bs Date: Thu, 28 Aug 2003 02:16:00 -0000 From: Igor Pechtchanski Reply-To: cygwin@cygwin.com To: Rich Elberger cc: cygwin@cygwin.com Subject: Re: parallel make In-Reply-To: Message-ID: References: Importance: Normal MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-SW-Source: 2003-08/txt/msg01432.txt.bz2 Rich, First off, if you're willing to forgo the ability to access UNC paths from Cygwin, you can set your Cygdrive prefix to '//' to address the drives in the same way you did in your old GNU toolset (see ). Secondly, why not use Cygwin perl? This way you automatically get the cygdrive prefix that Cygwin is configured with. Igor On Wed, 27 Aug 2003, Rich Elberger wrote: > This is starting to sound promising. I hope others have similar > experiences. > > Unfortunately I cannot just take make and the cyg dll. The problem comes > in with how different utils interpret drive paths: > > our old gnu: //c/... > perl: c:/... > cyg: /cygdrive/c/... (we mount NFS exports, hence the drive notation)... > > So, we basically need to move things from the inside out rather than start > patching things on the outside of the system, eventually getting to the > core. This makes the migration pretty expensive, so I would like to see > more cases before making the resource justification case. If it's a set > of production machines, no problem, but the change would have to occur on > all development workstations. > > I highly appreciate everyone's help because I think this is the only forum > I could ever get such kind of feedback. > > -- rich > > On Wed, 27 Aug 2003, Rolf Campbell wrote: > > > make -j does work in cygwin, to an extent. If you try to use too many > > processes, cygwin seems to flip out. -j20 does seem to work fine though > > (it only starts acting strang around -j100). > > > > On my large build system, we have a slow disk, and I find that when the > > disk cache is empty, -j4 speeds it up about 40%. When the build system > > is cached, -j slows things down by a few percent. This is dealing with > > 1 processor. Of course, if you have multiple processors, the speed > > should scale linearly (with 4 cpu's, -j4 is about 70% faster). > > > > Rich Elberger wrote: > > > > > Hi folks, > > > Currently our build environment uses parallel make (-j jobs option) on all > > > our unixes using gnu tools. We use an older version of gnu tools on our > > > windows boxes. The older make on the windows box does not do parallel > > > make (or at least correctly). I want to upgrade to the latest cygwin to > > > see if parallel make works, but this will require significant changes to > > > our build engine, so I would like to confirm a few things if possible. > > > > > > 1. Does the -j jobs option work well on windows. (part b: does it work > > > with the MSVC (6/7) compiler (which probably doesn't make a difference > > > anyway)? > > > 2. Has anyone done this in a very large project, and if so, do you have > > > any performance gain stats (which, I acknowledge, is tied to > > > processor-intensive makes and how many processors the machine has). > > > > > > I realize that dos does not allow for threading so I don't know if this is > > > a cmd.exe-related issue or not (since cmd.exe is the parent shell, I > > > don't know if this affects the behavior). > > > > > > thanks in advance -- -- http://cs.nyu.edu/~pechtcha/ |\ _,,,---,,_ pechtcha@cs.nyu.edu ZZZzz /,`.-'`' -. ;-;;,_ igor@watson.ibm.com |,4- ) )-,_. ,\ ( `'-' Igor Pechtchanski, Ph.D. '---''(_/--' `-'\_) fL a.k.a JaguaR-R-R-r-r-r-.-.-. Meow! "I have since come to realize that being between your mentor and his route to the bathroom is a major career booster." -- Patrick Naughton -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/