[ITK Community] [Insight-developers] Visual Studio 2012+ Parallelism

[Brian Helba]

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 <skalexander at gmail.com>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 <blowekamp at mail.nih.gov
> > 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 <matt.mccormick at kitware.com>
>> 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
>> > <blowekamp at mail.nih.gov> 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&currenttime=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
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>
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-- 
Brian Helba
Medical Imaging
Kitware, Inc.
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