diff options
Diffstat (limited to 'Modules/ProcessorCount.cmake')
| -rw-r--r-- | Modules/ProcessorCount.cmake | 35 |
1 files changed, 25 insertions, 10 deletions
diff --git a/Modules/ProcessorCount.cmake b/Modules/ProcessorCount.cmake index 001f928..eff4766 100644 --- a/Modules/ProcessorCount.cmake +++ b/Modules/ProcessorCount.cmake @@ -17,6 +17,14 @@ # set(CTEST_BUILD_FLAGS -j${N}) # set(ctest_test_args ${ctest_test_args} PARALLEL_LEVEL ${N}) # endif() +# +# This function is intended to offer an approximation of the value of the +# number of compute cores available on the current machine, such that you +# may use that value for parallel building and parallel testing. It is meant +# to help utilize as much of the machine as seems reasonable. Of course, +# knowledge of what else might be running on the machine simultaneously +# should be used when deciding whether to request a machine's full capacity +# all for yourself. # A more reliable way might be to compile a small C program that uses the CPUID # instruction, but that again requires compiler support or compiling assembler @@ -42,7 +50,7 @@ function(ProcessorCount var) if(WIN32) # Windows: set(count "$ENV{NUMBER_OF_PROCESSORS}") - message("ProcessorCount: WIN32, trying environment variable") + #message("ProcessorCount: WIN32, trying environment variable") endif() if(NOT count) @@ -51,9 +59,10 @@ function(ProcessorCount var) PATHS /usr/sbin /sbin) if(ProcessorCount_cmd_sysctl) execute_process(COMMAND ${ProcessorCount_cmd_sysctl} -n hw.ncpu + ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE count) - message("ProcessorCount: trying sysctl '${ProcessorCount_cmd_sysctl}'") + #message("ProcessorCount: trying sysctl '${ProcessorCount_cmd_sysctl}'") endif() endif() @@ -62,9 +71,10 @@ function(ProcessorCount var) find_program(ProcessorCount_cmd_getconf getconf) if(ProcessorCount_cmd_getconf) execute_process(COMMAND ${ProcessorCount_cmd_getconf} _NPROCESSORS_ONLN + ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE count) - message("ProcessorCount: trying getconf '${ProcessorCount_cmd_getconf}'") + #message("ProcessorCount: trying getconf '${ProcessorCount_cmd_getconf}'") endif() endif() @@ -74,11 +84,12 @@ function(ProcessorCount var) PATHS /usr/contrib/bin) if(ProcessorCount_cmd_machinfo) execute_process(COMMAND ${ProcessorCount_cmd_machinfo} + ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE machinfo_output) string(REGEX MATCHALL "Number of CPUs = ([0-9]+)" procs "${machinfo_output}") set(count "${CMAKE_MATCH_1}") - message("ProcessorCount: trying machinfo '${ProcessorCount_cmd_machinfo}'") + #message("ProcessorCount: trying machinfo '${ProcessorCount_cmd_machinfo}'") endif() endif() @@ -88,11 +99,12 @@ function(ProcessorCount var) PATHS /sbin) if(ProcessorCount_cmd_hinv) execute_process(COMMAND ${ProcessorCount_cmd_hinv} + ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE hinv_output) string(REGEX MATCHALL "([0-9]+) .* Processors" procs "${hinv_output}") set(count "${CMAKE_MATCH_1}") - message("ProcessorCount: trying hinv '${ProcessorCount_cmd_hinv}'") + #message("ProcessorCount: trying hinv '${ProcessorCount_cmd_hinv}'") endif() endif() @@ -102,11 +114,12 @@ function(ProcessorCount var) PATHS /usr/sbin) if(ProcessorCount_cmd_lsconf) execute_process(COMMAND ${ProcessorCount_cmd_lsconf} + ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE lsconf_output) string(REGEX MATCHALL "Number Of Processors: ([0-9]+)" procs "${lsconf_output}") set(count "${CMAKE_MATCH_1}") - message("ProcessorCount: trying lsconf '${ProcessorCount_cmd_lsconf}'") + #message("ProcessorCount: trying lsconf '${ProcessorCount_cmd_lsconf}'") endif() endif() @@ -115,11 +128,12 @@ function(ProcessorCount var) find_program(ProcessorCount_cmd_pidin pidin) if(ProcessorCount_cmd_pidin) execute_process(COMMAND ${ProcessorCount_cmd_pidin} info + ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE pidin_output) string(REGEX MATCHALL "Processor[0-9]+: " procs "${pidin_output}") list(LENGTH procs count) - message("ProcessorCount: trying pidin '${ProcessorCount_cmd_pidin}'") + #message("ProcessorCount: trying pidin '${ProcessorCount_cmd_pidin}'") endif() endif() @@ -128,11 +142,12 @@ function(ProcessorCount var) find_program(ProcessorCount_cmd_uname uname) if(ProcessorCount_cmd_uname) execute_process(COMMAND ${ProcessorCount_cmd_uname} -X + ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE OUTPUT_VARIABLE uname_X_output) string(REGEX MATCHALL "NumCPU = ([0-9]+)" procs "${uname_X_output}") set(count "${CMAKE_MATCH_1}") - message("ProcessorCount: trying uname -X '${ProcessorCount_cmd_uname}'") + #message("ProcessorCount: trying uname -X '${ProcessorCount_cmd_uname}'") endif() endif() @@ -145,7 +160,7 @@ function(ProcessorCount var) if(EXISTS "${cpuinfo_file}") file(STRINGS "${cpuinfo_file}" procs REGEX "^processor.: [0-9]+$") list(LENGTH procs count) - message("ProcessorCount: trying cpuinfo '${cpuinfo_file}'") + #message("ProcessorCount: trying cpuinfo '${cpuinfo_file}'") endif() endif() @@ -154,7 +169,7 @@ function(ProcessorCount var) # if(NOT count) set(count "$ENV{NUMBER_OF_PROCESSORS}") - message("ProcessorCount: last fallback, trying environment variable") + #message("ProcessorCount: last fallback, trying environment variable") endif() # Ensure an integer return (avoid inadvertently returning an empty string |