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Voluntary and involuntary context switches

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This commit is contained in:
flamingcow
2019-05-11 18:02:56 -07:00
parent 1eea8d42b7
commit 5b719ec74c
2 changed files with 21 additions and 13 deletions
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32
usage.cc
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@@ -34,25 +34,31 @@ void UsageTracker::Stop() {
CHECK(running_);
running_ = false;
const auto end_time_ = std::chrono::steady_clock::now();
const auto end_time = std::chrono::steady_clock::now();
rusage end_usage_;
PCHECK(getrusage(RUSAGE_THREAD, &end_usage_) == 0);
rusage end_usage;
PCHECK(getrusage(RUSAGE_THREAD, &end_usage) == 0);
wall_time_ += end_time_ - start_time_;
user_time_ += TvToNs(end_usage_.ru_utime) - TvToNs(start_usage_.ru_utime);
sys_time_ += TvToNs(end_usage_.ru_stime) - TvToNs(start_usage_.ru_stime);
wall_time_ += end_time - start_time_;
user_time_ += TvToNs(end_usage.ru_utime) - TvToNs(start_usage_.ru_utime);
sys_time_ += TvToNs(end_usage.ru_stime) - TvToNs(start_usage_.ru_stime);
vol_ctxt_sw_ += end_usage.ru_nvcsw - start_usage_.ru_nvcsw;
invol_ctxt_sw_ += end_usage.ru_nivcsw - start_usage_.ru_nivcsw;
}
void UsageTracker::Log() {
VLOG(1) << "usage:";
VLOG(1) << "\tevents: " << std::setw(20) << std::setfill(' ') << events_;
VLOG(1) << "\twall time: " << std::setw(20) << std::setfill(' ') << wall_time_.count() << "ns";
VLOG(1) << "\tuser time: " << std::setw(20) << std::setfill(' ') << user_time_.count() << "ns";
VLOG(1) << "\tsys time: " << std::setw(20) << std::setfill(' ') << sys_time_.count() << "ns";
VLOG(1) << "\twall time / event: " << std::setw(20) << std::setfill(' ') << (wall_time_ / events_).count() << "ns";
VLOG(1) << "\tuser time / event: " << std::setw(20) << std::setfill(' ') << (user_time_ / events_).count() << "ns";
VLOG(1) << "\tsys time / event: " << std::setw(20) << std::setfill(' ') << (sys_time_ / events_).count() << "ns";
VLOG(1) << "\t events: " << std::setw(19) << std::setfill(' ') << events_;
VLOG(1) << "\t wall time: " << std::setw(19) << std::setfill(' ') << wall_time_.count() << "ns";
VLOG(1) << "\t user time: " << std::setw(19) << std::setfill(' ') << user_time_.count() << "ns";
VLOG(1) << "\t sys time: " << std::setw(19) << std::setfill(' ') << sys_time_.count() << "ns";
VLOG(1) << "\t vol ctxt sw: " << std::setw(19) << std::setfill(' ') << vol_ctxt_sw_;
VLOG(1) << "\t invol ctxt sw: " << std::setw(19) << std::setfill(' ') << invol_ctxt_sw_;
VLOG(1) << "\t wall time / event: " << std::setw(19) << std::setfill(' ') << (wall_time_ / events_).count() << "ns";
VLOG(1) << "\t user time / event: " << std::setw(19) << std::setfill(' ') << (user_time_ / events_).count() << "ns";
VLOG(1) << "\t sys time / event: " << std::setw(19) << std::setfill(' ') << (sys_time_ / events_).count() << "ns";
VLOG(1) << "\t vol ctxt sw / event: " << std::setw(19) << std::setfill(' ') << (vol_ctxt_sw_ / events_);
VLOG(1) << "\tinvol ctxt sw / event: " << std::setw(19) << std::setfill(' ') << (invol_ctxt_sw_ / events_);
}
} // namespace fireusage

2
usage.h
View File

@@ -21,6 +21,8 @@ class UsageTracker {
std::chrono::nanoseconds wall_time_;
std::chrono::nanoseconds user_time_;
std::chrono::nanoseconds sys_time_;
uint64_t vol_ctxt_sw_ = 0;
uint64_t invol_ctxt_sw_ = 0;
std::chrono::steady_clock::time_point start_time_;
rusage start_usage_;