Please note, There's another bug related to Visual Studio (multiple versions) and the "/MP" flag.
See that: between yesterday [1] and today [2], Brad added "MAKE_CXX_FLAGS:STRING=/MP". to the "Win32-VS11-Release-Shared"@"lhcp-vm-win701.nlm" client build. The result is 199 new warnings [3] of: "warning C4530: C++ exception handler used, but unwind semantics are not enabled. Specify /EHsc". This exact same bug has also occurred on "Win64-VS9-Release-Shared"@"dash5win7x64.kitware" when I enabled the same flag for one night [4] (note that the Static build had configure errors for another reason, and never attempted to build with "/MP"). I immediately disabled the flag for the next night, intending to troubleshoot it at some other time. The issue on "lhcp-vm-win701.nlm" seems to confirm that this is a real bug. [1] http://open.cdash.org/viewNotes.php?buildid=3213173 [2] http://open.cdash.org/viewNotes.php?buildid=3213955 [3] http://open.cdash.org/viewBuildError.php?type=1&buildid=3213955 [4] http://open.cdash.org/buildSummary.php?buildid=3205792 Best, Brian On Mon, Feb 10, 2014 at 11:29 AM, Simon Alexander <[email protected]>wrote: > I have been using /MP for a while now, and recall needing it on VS2010 as > well (but that was a while ago so I may be misremembering). > > To avoid the problem that Matt mentions, you can give it an argument for > the maximum number of processes (by default, it will pick the number of > effective cores it can find). > > > On Mon, Feb 10, 2014 at 11:24 AM, Bradley Lowekamp <[email protected] > > wrote: > >> Matt, >> >> My point was that with VS10 and prior we were getting good target level >> parallelism, while it appears that with VS11 we are no long getting good >> target level parallelism and need this additional compiler level >> parallelism that "/MP" provides. >> >> I don't understand is something change to cause this. Why? >> >> Have other experience the same things? >> >> Brad >> >> On Feb 10, 2014, at 10:53 AM, Matt McCormick <[email protected]> >> wrote: >> >> > Hi Brad, >> > >> > My understanding is that this flag can be very helpful for speeding >> > things up when the system can handle it, but it is not on by default, >> > because, from the article "The downside is that the IDE will still >> > perform target level parallelism along with object level parallelism >> > which can lead to excessive parallelism grinding your machine and GUI >> > to a halt." >> > >> > Thanks, >> > Matt >> > >> > On Mon, Feb 10, 2014 at 9:30 AM, Bradley Lowekamp >> > <[email protected]> wrote: >> >> Hello, >> >> >> >> I just added the "/MP" flag to my "Win32-VS11-Release-Shared"[1] >> build, based on information from reading Kitware blog entry entitled >> "CMake: building with all your cores"[3]. Adding this flag changed the >> build time from 5h47min to 1hr10min . I don't recall having to do this >> before with VS10, VS9, has something changed with these more recent Visual >> Studios? >> >> >> >> The system is running on a VM, allocated 4 cores and 16GB of memory. >> Many of the VS11/VS12 build have been taking over 2hrs and a couple much >> longer. >> >> >> >> This chart is an indication of the excessive build time on this system: >> >> >> http://open.cdash.org/viewSite.php?siteid=8833&project=2¤ttime=1391907600 >> >> >> >> Incidentally the recent VS11 builds I have setup for SimpleITK don't >> seem to suffer from the same issue. >> >> >> >> >> >> >> >> [1] http://open.cdash.org/buildSummary.php?buildid=3213955 >> >> [2] http://open.cdash.org/viewNotes.php?buildid=3213955 >> >> [3] http://www.kitware.com/blog/home/post/434 >> >> _______________________________________________ >> >> Powered by www.kitware.com >> >> >> >> Visit other Kitware open-source projects at >> >> http://www.kitware.com/opensource/opensource.html >> >> >> >> Kitware offers ITK Training Courses, for more information visit: >> >> http://kitware.com/products/protraining.php >> >> >> >> Please keep messages on-topic and check the ITK FAQ at: >> >> http://www.itk.org/Wiki/ITK_FAQ >> >> >> >> Follow this link to subscribe/unsubscribe: >> >> http://www.itk.org/mailman/listinfo/insight-developers >> >> _______________________________________________ >> Powered by www.kitware.com >> >> Visit other Kitware open-source projects at >> http://www.kitware.com/opensource/opensource.html >> >> Kitware offers ITK Training Courses, for more information visit: >> http://kitware.com/products/protraining.php >> >> Please keep messages on-topic and check the ITK FAQ at: >> http://www.itk.org/Wiki/ITK_FAQ >> >> Follow this link to subscribe/unsubscribe: >> http://www.itk.org/mailman/listinfo/insight-developers >> > > > _______________________________________________ > Powered by www.kitware.com > > Visit other Kitware open-source projects at > http://www.kitware.com/opensource/opensource.html > > Kitware offers ITK Training Courses, for more information visit: > http://kitware.com/products/protraining.php > > Please keep messages on-topic and check the ITK FAQ at: > http://www.itk.org/Wiki/ITK_FAQ > > Follow this link to subscribe/unsubscribe: > http://www.itk.org/mailman/listinfo/insight-developers > > -- Brian Helba Medical Imaging Kitware, Inc.
_______________________________________________ Powered by www.kitware.com Visit other Kitware open-source projects at http://www.kitware.com/opensource/opensource.html Kitware offers ITK Training Courses, for more information visit: http://kitware.com/products/protraining.php Please keep messages on-topic and check the ITK FAQ at: http://www.itk.org/Wiki/ITK_FAQ Follow this link to subscribe/unsubscribe: http://www.itk.org/mailman/listinfo/insight-developers
