[CMake] VS2012 builds using v3.1.0 are a lot slower than v2.8.12

[David Cole]

If you open the "Tools > Options" dialog in Visual Studio, and
navigate to the "Projects and Solutions > Build and Run" tab, what is
your "maximum number of parallel project builds" value?

For maximum parallel build capability, it should be set to the same as
the number of cores you have.


D


On Tue, Jan 20, 2015 at 7:10 AM, Yves Frederix
<yves.frederix+cmake at gmail.com> wrote:
>>> 3.1.0:    10m50s
>>> 2.8.12:   4m02s
>>> 3.1.0 (/MP): 6m29s
>>> 2.8.12 (/MP): 3m48s
>>
>> I cannot reproduce that.  On my machine for OpenCV (as of commit
>> 5e92a777) I get about the same time for either version of CMake.
>>
>>  3.1.0         : 8m57s
>>  2.8.12.2      : 8m58s
>>  3.1.0    (/MP): 4m52s
>>  2.8.12.2 (/MP): 4m57s
>>
>> Check in your cases that 3.1.0 does not activate additional parts of
>> the project that are not built under 2.8.12.
>>
>> Also please try a command-line build with just "msbuild" instead of
>> going through "cmake --build":
>>
>>  msbuild ALL_BUILD.vcxproj /p:Configuration=Release /p:VisualStudioVersion=12.0
>
> (shouldn't this have been VisualStudioVersion=11.0?)
>
> So here are the timings:
>
> 3.1.0: 11m52s
> 2.8.12: 11m21s
>
> When keeping an eye on the resource monitor, I can also see that,
> while "cmake --build ." makes use of all the CPU cores (for 2.8.12) ,
> this is not the case while running msbuild manually.
>
> Yves
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