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

[Hendrik Sattler]

Hi,

but msbuild does not use this setting from VS, only devenv does.

See option /m

HS


Am 20. Januar 2015 14:54:26 MEZ, schrieb David Cole via CMake <cmake at cmake.org>:
>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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