61 lines
2.2 KiB
CMake
61 lines
2.2 KiB
CMake
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# - ProcessorCount(var)
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# Determine the number of processors/cores and save value in ${var}
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#
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# Sets the variable named ${var} to the number of physical cores available on
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# the machine if the information can be determined. Otherwise it is set to 0.
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# Currently this functionality is only implemented for Windows, Mac OS X and
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# Unix systems providing getconf or the /proc/cpuinfo interface (e.g. Linux).
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# A more reliable way might be to compile a small C program that uses the CPUID
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# instruction, but that again requires compiler support or compiling assembler
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# code.
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#=============================================================================
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# Copyright 2002-2009 Kitware, Inc.
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#
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# Distributed under the OSI-approved BSD License (the "License");
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# see accompanying file Copyright.txt for details.
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#
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# This software is distributed WITHOUT ANY WARRANTY; without even the
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# implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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# See the License for more information.
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#=============================================================================
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# (To distributed this file outside of CMake, substitute the full
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# License text for the above reference.)
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function(ProcessorCount var)
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# Unknown:
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set(count 0)
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if(WIN32)
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# Windows:
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set(count "$ENV{NUMBER_OF_PROCESSORS}")
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elseif(APPLE)
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# Mac:
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find_program(ProcessorCount_cmd_sysctl sysctl
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PATHS /usr/sbin)
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if(ProcessorCount_cmd_sysctl)
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execute_process(COMMAND ${ProcessorCount_cmd_sysctl} -n hw.ncpu
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OUTPUT_STRIP_TRAILING_WHITESPACE
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OUTPUT_VARIABLE count)
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endif()
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else()
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find_program(ProcessorCount_cmd_getconf getconf)
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if(ProcessorCount_cmd_getconf)
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# Linux and other systems with getconf:
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execute_process(COMMAND ${ProcessorCount_cmd_getconf} _NPROCESSORS_ONLN
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OUTPUT_STRIP_TRAILING_WHITESPACE
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OUTPUT_VARIABLE count)
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else()
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# Linux and other systems with /proc/cpuinfo:
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set(cpuinfo_file /proc/cpuinfo)
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if(EXISTS "${cpuinfo_file}")
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file(STRINGS "${cpuinfo_file}" procs REGEX "^processor.: [0-9]+$")
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list(LENGTH procs count)
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endif()
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endif()
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endif()
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set(${var} ${count} PARENT_SCOPE)
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endfunction()
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