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/*
*
* Copyright 2015 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include "test/cpp/qps/usage_timer.h"
#include <fstream>
#include <sstream>
#include <string>
#include <grpc/support/log.h>
#include <grpc/support/time.h>
#ifdef __linux__
#include <sys/resource.h>
#include <sys/time.h>
static double time_double(struct timeval* tv) {
return tv->tv_sec + 1e-6 * tv->tv_usec;
}
#endif
UsageTimer::UsageTimer() : start_(Sample()) {}
double UsageTimer::Now() {
auto ts = gpr_now(GPR_CLOCK_REALTIME);
return ts.tv_sec + 1e-9 * ts.tv_nsec;
}
static void get_resource_usage(double* utime, double* stime) {
#ifdef __linux__
struct rusage usage;
getrusage(RUSAGE_SELF, &usage);
*utime = time_double(&usage.ru_utime);
*stime = time_double(&usage.ru_stime);
#else
*utime = 0;
*stime = 0;
#endif
}
static void get_cpu_usage(unsigned long long* total_cpu_time,
unsigned long long* idle_cpu_time) {
#ifdef __linux__
std::ifstream proc_stat("/proc/stat");
proc_stat.ignore(5);
std::string cpu_time_str;
std::string first_line;
std::getline(proc_stat, first_line);
std::stringstream first_line_s(first_line);
for (int i = 0; i < 10; ++i) {
std::getline(first_line_s, cpu_time_str, ' ');
*total_cpu_time += std::stol(cpu_time_str);
if (i == 3) {
*idle_cpu_time = std::stol(cpu_time_str);
}
}
#else
gpr_log(GPR_INFO, "get_cpu_usage(): Non-linux platform is not supported.");
#endif
}
UsageTimer::Result UsageTimer::Sample() {
Result r;
r.wall = Now();
get_resource_usage(&r.user, &r.system);
r.total_cpu_time = 0;
r.idle_cpu_time = 0;
get_cpu_usage(&r.total_cpu_time, &r.idle_cpu_time);
return r;
}
UsageTimer::Result UsageTimer::Mark() const {
Result s = Sample();
Result r;
r.wall = s.wall - start_.wall;
r.user = s.user - start_.user;
r.system = s.system - start_.system;
r.total_cpu_time = s.total_cpu_time - start_.total_cpu_time;
r.idle_cpu_time = s.idle_cpu_time - start_.idle_cpu_time;
return r;
}
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