Function CgroupV2Cpus

util/system/info.cpp:86–100

In cgroups v2 there isn't a dedicated "cpu" directory under /sys/fs/cgroup, so the approximation of the number of CPUs may use the cpu.max file. The format is the following: $MAX $PERIOD Which indicates that the group may consume up to $MAX in each $PERIOD duration. The "max" value could be either the string "max" or a number. In the first case our approximation doesn't work so we can bail out e

our approximation doesn't work so we can bail out earlier.
*/
static inline double CgroupV2Cpus(const TString& cpuMaxPath) {
    try {
        TVector<TString> cgroupCpuMax = StringSplitter(TFileInput(cpuMaxPath).ReadAll()).Split(' ').Take(2);
        double max = FromString<int32_t>(StripString(cgroupCpuMax[0]));
        double period = FromString<int32_t>(StripString(cgroupCpuMax[1]));

        if (max <= 0 || period <= 0) {
            return 0;
        }

        return max / period;
    } catch (...) {
        return 0;
    }
}

static inline double CgroupCpus() {
    static const TString cpuMaxPath("/sys/fs/cgroup/cpu.max");