Comments on: Multi-processor building in Visual Studio 2005 http://blog.280z28.org/archives/2007/10/17/ Because it's easier than editing the HTML by hand. Sat, 30 Jan 2010 21:54:19 -0600 http://wordpress.org/?v=2.9.2 hourly 1 By: Andy http://blog.280z28.org/archives/2007/10/17/comment-page-1/#comment-6973 Andy Wed, 15 Apr 2009 18:10:55 +0000 http://blog.280z28.org/archives/2007/10/17/#comment-6973 <p>Unfortunately, the "/MPx" switch is beta or "texhnology preview" in VS2005.</p> <p>There are a host of undefined issues surrounding its use.</p> <p>For instance, if you build with Compile and Continue or fast (not full) Rebuild then the compilations might be invalid.</p> <p>We used the switch on our production build server for a while but noticed that every once in a while it would cause the build process to hang indefinitely (needing a reboot)</p> <p>In VS2008 Microsoft fixed a few issues and worked around some others by enforcing that you can no longer set invalid combinations of compiler switches. For instance, since compile-and-continue was causing problems with "/MPx", they made it an error to have those two configured at the same time.</p> <p>Because of the "undefined behavior" in VS2005, I'm dropping "/MP4" from all our projects until we upgrade to VS2008 or VS2010.</p> <p>THe syntax is to say "/MP" followed by the number of processors you want to use, so "/MP2" is 2-processors and "/MP4" spreads over four processor.</p> <p>Sadly I cannot test if "/MP64" works, but I salivate thinking about it :-)</p> <p>Andy</p> Unfortunately, the “/MPx” switch is beta or “texhnology preview” in VS2005.

There are a host of undefined issues surrounding its use.

For instance, if you build with Compile and Continue or fast (not full) Rebuild then the compilations might be invalid.

We used the switch on our production build server for a while but noticed that every once in a while it would cause the build process to hang indefinitely (needing a reboot)

In VS2008 Microsoft fixed a few issues and worked around some others by enforcing that you can no longer set invalid combinations of compiler switches. For instance, since compile-and-continue was causing problems with “/MPx”, they made it an error to have those two configured at the same time.

Because of the “undefined behavior” in VS2005, I’m dropping “/MP4″ from all our projects until we upgrade to VS2008 or VS2010.

THe syntax is to say “/MP” followed by the number of processors you want to use, so “/MP2″ is 2-processors and “/MP4″ spreads over four processor.

Sadly I cannot test if “/MP64″ works, but I salivate thinking about it :-)

Andy

]]> By: Andy http://blog.280z28.org/archives/2007/10/17/comment-page-1/#comment-3544 Andy Wed, 09 Jul 2008 19:50:48 +0000 http://blog.280z28.org/archives/2007/10/17/#comment-3544 <p>@ftrocchi:</p> <p>In the Visual Studio options dialog, go to Project and Solutions | Build and Run. There is a TextBox near the top of the window, with the text "maximum number of parallel project builds" next to it. Set this to the maximum number of projects that you want Visual Studio to build at one time. I believe by default this is set to the number of CPUs you have (including cores, hyperthreading, etc.).</p> <p>I'm pretty sure that this is a feature new to Visual Studio 2005.</p> @ftrocchi:

In the Visual Studio options dialog, go to Project and Solutions | Build and Run. There is a TextBox near the top of the window, with the text “maximum number of parallel project builds” next to it. Set this to the maximum number of projects that you want Visual Studio to build at one time. I believe by default this is set to the number of CPUs you have (including cores, hyperthreading, etc.).

I’m pretty sure that this is a feature new to Visual Studio 2005.

]]> By: Source-level parallel build in Visual Studio 2005 | veracity http://blog.280z28.org/archives/2007/10/17/comment-page-1/#comment-2948 Source-level parallel build in Visual Studio 2005 | veracity Fri, 15 Feb 2008 10:28:05 +0000 http://blog.280z28.org/archives/2007/10/17/#comment-2948 <p>[...] what about VS 2005? I did some more searching and, lo and behold, found this blog entry which says the /MP  option is also available, but undocumented, in Visual Studio [...]</p> [...] what about VS 2005? I did some more searching and, lo and behold, found this blog entry which says the /MP  option is also available, but undocumented, in Visual Studio [...]

]]> By: ftrocchi http://blog.280z28.org/archives/2007/10/17/comment-page-1/#comment-2738 ftrocchi Fri, 30 Nov 2007 13:00:46 +0000 http://blog.280z28.org/archives/2007/10/17/#comment-2738 <p>Some questions about this:</p> <ol> <li>How do you "setting the number of parallel project builds to 2"?</li> <li>Do you know if this is available in Visual Studio 2k3?</li> </ol> Some questions about this:

  1. How do you “setting the number of parallel project builds to 2″?
  2. Do you know if this is available in Visual Studio 2k3?
]]> By: 280Z28 http://blog.280z28.org/archives/2007/10/17/comment-page-1/#comment-2543 280Z28 Wed, 31 Oct 2007 18:49:31 +0000 http://blog.280z28.org/archives/2007/10/17/#comment-2543 <p>Sorry for the confusion. I added a screenshot of where this option goes. :)</p> Sorry for the confusion. I added a screenshot of where this option goes. :)

]]> By: Tom http://blog.280z28.org/archives/2007/10/17/comment-page-1/#comment-2541 Tom Wed, 31 Oct 2007 10:36:12 +0000 http://blog.280z28.org/archives/2007/10/17/#comment-2541 <p>Where do you set the /MP flag? The only place I could see was in Project->Properties->Configuration Properties->C/C++->Command Line->Advanced Options. Is this what you mean?</p> <p>Thanks.</p> Where do you set the /MP flag? The only place I could see was in Project->Properties->Configuration Properties->C/C++->Command Line->Advanced Options. Is this what you mean?

Thanks.

]]>