73 lines
2.0 KiB
C++
73 lines
2.0 KiB
C++
// Copyright 2019 Roman Perepelitsa.
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//
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// This file is part of GitStatus.
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//
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// GitStatus is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GitStatus is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
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#include "timer.h"
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#include <sys/resource.h>
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#include <sys/time.h>
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#include <time.h>
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#include <cmath>
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#include <limits>
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#include "check.h"
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#include "logging.h"
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namespace gitstatus {
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namespace {
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double CpuTimeMs() {
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auto ToMs = [](const timeval& tv) { return 1e3 * tv.tv_sec + 1e-3 * tv.tv_usec; };
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rusage usage = {};
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CHECK(getrusage(RUSAGE_SELF, &usage) == 0) << Errno();
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return ToMs(usage.ru_utime) + ToMs(usage.ru_stime);
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}
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double WallTimeMs() {
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// An attempt to call clock_gettime on an ancient version of MacOS fails at runtime.
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// It's possible to detect the presence of clock_gettime at runtime but I don't have
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// an ancient MacOS to test the code. Hence this.
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#ifdef __APPLE__
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return std::numeric_limits<double>::quiet_NaN();
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#else
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struct timespec ts;
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clock_gettime(CLOCK_MONOTONIC, &ts);
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return 1e3 * ts.tv_sec + 1e-6 * ts.tv_nsec;
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#endif
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}
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} // namespace
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void Timer::Start() {
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cpu_ = CpuTimeMs();
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wall_ = WallTimeMs();
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}
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void Timer::Report(const char* msg) {
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double cpu = CpuTimeMs() - cpu_;
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if (std::isnan(wall_)) {
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LOG(INFO) << "Timing for: " << msg << ": " << cpu << "ms cpu";
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} else {
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double wall = WallTimeMs() - wall_;
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LOG(INFO) << "Timing for: " << msg << ": " << cpu << "ms cpu, " << wall << "ms wall";
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}
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Start();
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}
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} // namespace gitstatus
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