commit old stuff

[tools.git] / tools / rusage_precise.c

diff --git a/tools/rusage_precise.c b/tools/rusage_precise.c
new file mode 100644 (file)
index 0000000..3545727
--- /dev/null
+++ b/tools/rusage_precise.c
@@ -0,0 +1,51 @@
+#include <stdio.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <errno.h>
+
+#define eprintf(...) fprintf(stderr, __VA_ARGS__) 
+#define FARG_TIMEVAL(tv) tv.tv_sec, tv.tv_usec
+#define FSTR_TIMEVAL "%li.%06li"
+
+int main(int argc, char **argv) {
+  #define CHECK_USAGE if (argc < 2) return eprintf("invocation: rusage_precise [--machine-readable] <command> [<args...>]\n"), 1;
+  CHECK_USAGE
+  int machine_readable = 0;
+  if (!strcmp(argv[1], "--machine-readable")) machine_readable = 1, argv++, argc--;
+  CHECK_USAGE
+
+  pid_t child = fork();
+  if (child == -1) return perror("fork failed"), 1;
+  if (child == 0) {
+    execvp(argv[1], argv+1);
+    return perror("execvp failed"), 1;
+  }
+
+  int status;
+  struct rusage ru;
+  errno = 0;
+  if (wait4(child, &status, 0, &ru) != child) return perror("wait4 failed"), 1;
+
+  if (machine_readable) {
+    eprintf(FSTR_TIMEVAL "\t" FSTR_TIMEVAL "\t%li\t%li\t%li\t%li\t%li\t%li\t%li\n",
+            FARG_TIMEVAL(ru.ru_utime), FARG_TIMEVAL(ru.ru_stime),
+            ru.ru_maxrss, ru.ru_minflt, ru.ru_majflt,
+            ru.ru_inblock, ru.ru_oublock, ru.ru_nvcsw,
+            ru.ru_nivcsw);
+  } else {
+    eprintf("        user CPU (s): " FSTR_TIMEVAL "\n", FARG_TIMEVAL(ru.ru_utime));
+    eprintf("      system CPU (s): " FSTR_TIMEVAL "\n", FARG_TIMEVAL(ru.ru_stime));
+    eprintf("   max RSS size (kB): %li\n", ru.ru_maxrss);
+    eprintf("        minor faults: %li\n", ru.ru_minflt);
+    eprintf("        major faults: %li\n", ru.ru_majflt);
+    eprintf("         fs inblocks: %li\n", ru.ru_inblock);
+    eprintf("        fs outblocks: %li\n", ru.ru_oublock);
+    eprintf("  voluntary switches: %li\n", ru.ru_nvcsw);
+    eprintf("involuntary switches: %li\n", ru.ru_nivcsw);
+  }
+  return 0;
+}