Use sched_getaffinity syscall to get online CPUs on Linux#20
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The sched_getaffinity syscall returns the mask of online CPUs, so prefer that over reading sysfs files on Linux. Only if the syscall returns an errors, fall back to the existing method. Running `strace getconf _NPROCESSORS_ONLN` this also seems to be the method glibc's `getconf` uses.
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The sched_getaffinity syscall returns the mask of online CPUs, so prefer
that over reading sysfs files on Linux. Only if the syscall returns an
errors, fall back to the existing method.
Running
strace getconf _NPROCESSORS_ONLNthis also seems to be themethod glibc's
getconfuses.