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Example, my x86 machine show: $ cat /sys/devices/system/cpu/possible 0-31 $ find /sys/devices/system/cpu -maxdepth 1 -name 'cpu[0-9]*' /sys/devices/system/cpu/cpu0 /sys/devices/system/cpu/cpu1 /sys/devices/system/cpu/cpu2 /sys/devices/system/cpu/cpu3 /sys/devices/system/cpu/cpu4 /sys/devices/system/cpu/cpu5 /sys/devices/system/cpu/cpu6 /sys/devices/system/cpu/cpu7And, this is match w/ /sys/devices/system/cpu/present.
btw, Needless to say, sysconf (_SC_NPROCESSORS_CONF) should read /sys/devices/system/cpu/present if it exist because directory reading is not atomic operation and might lead to scary result.
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