Re: [CMake] How to determine the number of processors available from CMake code
Would be nice to have this as a module: http://cmake.org/Bug/view.php?id=11302
On 8. Oct, 2010, at 24:41 , David Cole wrote:
> Thanks!
>
> On Thu, Oct 7, 2010 at 6:08 PM, Mark Moll wrote:
>
>> On OS X, this command might be easier / faster:
>>
>> sysctl -n hw.ncpu
>>
>> On Oct 7, 2010, at 3:50 PM, David Cole wrote:
>>
>>> I just posted a short blog article demonstrating how to figure out the
>> number of processors available for a "make -j" or a scripted ctest_build
>> call (with the "Unix Makefiles" generator) on Linux, Mac and Windows. Please
>> let me know if you have any ideas for how it might be improved or extended.
>>>
>>> http://www.kitware.com/blog/home/post/63
>>>
>>>
>>> Cheers,
>>> David
>>>
>>>
>>> Blog text copied here, too, for search-ability on the mailing list
>> archives:
>>>
>> ==
>>> At the end of this script snippet, the CMake variable PROCESSOR_COUNT has
>> a value appropriate for passing to make's -j for parallel builds.
>>>
>>> When used in a ctest -S script, you can call...
>>>
>>> if(PROCESSOR_COUNT)
>>> set(CTEST_BUILD_FLAGS "-j${PROCESSOR_COUNT}")
>>> endif()
>>>
>>> ...to enable parallel builds with "Unix Makefiles" and the ctest_build
>> command.
>>>
>>>
>>> Here's the snippet:
>>> if(NOT DEFINED PROCESSOR_COUNT)
>>> # Unknown:
>>> set(PROCESSOR_COUNT 0)
>>>
>>> # Linux:
>>> set(cpuinfo_file "/proc/cpuinfo")
>>> if(EXISTS "${cpuinfo_file}")
>>>file(STRINGS "${cpuinfo_file}" procs REGEX "^processor.: [0-9]+$")
>>>list(LENGTH procs PROCESSOR_COUNT)
>>> endif()
>>>
>>> # Mac:
>>> if(APPLE)
>>>find_program(cmd_sys_pro "system_profiler")
>>>if(cmd_sys_pro)
>>> execute_process(COMMAND ${cmd_sys_pro} OUTPUT_VARIABLE info)
>>> string(REGEX REPLACE "^.*Total Number Of Cores: ([0-9]+).*$" "\\1"
>>>PROCESSOR_COUNT "${info}")
>>>endif()
>>> endif()
>>>
>>> # Windows:
>>> if(WIN32)
>>>set(PROCESSOR_COUNT "$ENV{NUMBER_OF_PROCESSORS}")
>>> endif()
>>> endif()
>>>
>>> ___
>>> Powered by www.kitware.com
>>>
>>> Visit other Kitware open-source projects at
>> http://www.kitware.com/opensource/opensource.html
>>>
>>> Please keep messages on-topic and check the CMake FAQ at:
>> http://www.cmake.org/Wiki/CMake_FAQ
>>>
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>>
>> --
>> Mark Moll
>>
>>
>>
>>
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Re: [CMake] How to determine the number of processors available from CMake code
Thanks!
On Thu, Oct 7, 2010 at 6:08 PM, Mark Moll wrote:
> On OS X, this command might be easier / faster:
>
> sysctl -n hw.ncpu
>
> On Oct 7, 2010, at 3:50 PM, David Cole wrote:
>
> > I just posted a short blog article demonstrating how to figure out the
> number of processors available for a "make -j" or a scripted ctest_build
> call (with the "Unix Makefiles" generator) on Linux, Mac and Windows. Please
> let me know if you have any ideas for how it might be improved or extended.
> >
> > http://www.kitware.com/blog/home/post/63
> >
> >
> > Cheers,
> > David
> >
> >
> > Blog text copied here, too, for search-ability on the mailing list
> archives:
> >
> ==
> > At the end of this script snippet, the CMake variable PROCESSOR_COUNT has
> a value appropriate for passing to make's -j for parallel builds.
> >
> > When used in a ctest -S script, you can call...
> >
> > if(PROCESSOR_COUNT)
> > set(CTEST_BUILD_FLAGS "-j${PROCESSOR_COUNT}")
> > endif()
> >
> > ...to enable parallel builds with "Unix Makefiles" and the ctest_build
> command.
> >
> >
> > Here's the snippet:
> > if(NOT DEFINED PROCESSOR_COUNT)
> > # Unknown:
> > set(PROCESSOR_COUNT 0)
> >
> > # Linux:
> > set(cpuinfo_file "/proc/cpuinfo")
> > if(EXISTS "${cpuinfo_file}")
> > file(STRINGS "${cpuinfo_file}" procs REGEX "^processor.: [0-9]+$")
> > list(LENGTH procs PROCESSOR_COUNT)
> > endif()
> >
> > # Mac:
> > if(APPLE)
> > find_program(cmd_sys_pro "system_profiler")
> > if(cmd_sys_pro)
> > execute_process(COMMAND ${cmd_sys_pro} OUTPUT_VARIABLE info)
> > string(REGEX REPLACE "^.*Total Number Of Cores: ([0-9]+).*$" "\\1"
> > PROCESSOR_COUNT "${info}")
> > endif()
> > endif()
> >
> > # Windows:
> > if(WIN32)
> > set(PROCESSOR_COUNT "$ENV{NUMBER_OF_PROCESSORS}")
> > endif()
> > endif()
> >
> > ___
> > Powered by www.kitware.com
> >
> > Visit other Kitware open-source projects at
> http://www.kitware.com/opensource/opensource.html
> >
> > Please keep messages on-topic and check the CMake FAQ at:
> http://www.cmake.org/Wiki/CMake_FAQ
> >
> > Follow this link to subscribe/unsubscribe:
> > http://www.cmake.org/mailman/listinfo/cmake
>
> --
> Mark Moll
>
>
>
>
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[CMake] How to determine the number of processors available from CMake code
I just posted a short blog article demonstrating how to figure out the
number of processors available for a "make -j" or a scripted ctest_build
call (with the "Unix Makefiles" generator) on Linux, Mac and Windows. Please
let me know if you have any ideas for how it might be improved or extended.
http://www.kitware.com/blog/home/post/63
Cheers,
David
Blog text copied here, too, for search-ability on the mailing list archives:
==
At the end of this script snippet, the CMake variable PROCESSOR_COUNT has a
value appropriate for passing to make's -j for parallel builds.
When used in a ctest -S script, you can call...
if(PROCESSOR_COUNT)
set(CTEST_BUILD_FLAGS "-j${PROCESSOR_COUNT}")
endif()
...to enable parallel builds with "Unix Makefiles" and the ctest_build
command.
Here's the snippet:
if(NOT DEFINED PROCESSOR_COUNT)
# Unknown:
set(PROCESSOR_COUNT 0)
# Linux:
set(cpuinfo_file "/proc/cpuinfo")
if(EXISTS "${cpuinfo_file}")
file(STRINGS "${cpuinfo_file}" procs REGEX "^processor.: [0-9]+$")
list(LENGTH procs PROCESSOR_COUNT)
endif()
# Mac:
if(APPLE)
find_program(cmd_sys_pro "system_profiler")
if(cmd_sys_pro)
execute_process(COMMAND ${cmd_sys_pro} OUTPUT_VARIABLE info)
string(REGEX REPLACE "^.*Total Number Of Cores: ([0-9]+).*$" "\\1"
PROCESSOR_COUNT "${info}")
endif()
endif()
# Windows:
if(WIN32)
set(PROCESSOR_COUNT "$ENV{NUMBER_OF_PROCESSORS}")
endif()
endif()
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