Function serialize

runtime/Perf.cc:1120–1128

Measure the cost of cpuid

// Measure the cost of cpuid
double serialize() {
    int count = 1000000;
    uint64_t start = Cycles::rdtsc();
    for (int i = 0; i < count; i++) {
        Util::serialize();
    }
    uint64_t stop = Cycles::rdtsc();
    return Cycles::toSeconds(stop - start)/count;
}

double cond_wait_for_millisecond() {
    int count = 100;