sd-perf-test.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>

const char *sd_cmd[] = {"/usr/bin/systemd-run", "--scope", "/usr/bin/sleep",
                        "0.005", NULL};
// Bash is used to perform some random syscalls to make this test more fair.
const char *nosd_cmd[] = {"/bin/bash", "-c", "/usr/bin/sleep 0.005", NULL};

#define HEAT 10
#define N 10

int main(int argc, char **argv, char **envp) {
  int heat = HEAT;
  int count = N;
  double sum = 0;
  time_t prev = time(NULL);
  int iterations = 0;
  while (count) {
    if (!fork()) {
      execve(CMD[0], CMD, envp);
    } else {
      wait(NULL);
    }
    ++iterations;
    time_t now = time(NULL);
    if (prev != now) {
      prev = now;
      if (heat) {
        --heat;
      } else {
        sum += iterations;
        iterations = 0;
        --count;
      }
    }
  }
  printf("Result: %lf\n", sum / N);
}