Function ShowUsage

src/backend/tcop/postgres.c:6274–6371

}

void
ShowUsage(const char *title)
{
	StringInfoData str;
	struct timeval user,
				sys;
	struct timeval elapse_t;
	struct rusage r;

	getrusage(RUSAGE_SELF, &r);
	gettimeofday(&elapse_t, NULL);
	memcpy((char *) &user, (char *) &r.ru_utime, sizeof(user));
	memcpy((char *) &sys, (char *) &r.ru_stime, sizeof(sys));
	if (elapse_t.tv_usec < Save_t.tv_usec)
	{
		elapse_t.tv_sec--;
		elapse_t.tv_usec += 1000000;
	}
	if (r.ru_utime.tv_usec < Save_r.ru_utime.tv_usec)
	{
		r.ru_utime.tv_sec--;
		r.ru_utime.tv_usec += 1000000;
	}
	if (r.ru_stime.tv_usec < Save_r.ru_stime.tv_usec)
	{
		r.ru_stime.tv_sec--;
		r.ru_stime.tv_usec += 1000000;
	}

	/*
	 * The only stats we don't show here are ixrss, idrss, isrss.  It takes
	 * some work to interpret them, and most platforms don't fill them in.
	 */
	initStringInfo(&str);

	appendStringInfoString(&str, "! system usage stats:\n");
	appendStringInfo(&str,
					 "!\t%ld.%06ld s user, %ld.%06ld s system, %ld.%06ld s elapsed\n",
					 (long) (r.ru_utime.tv_sec - Save_r.ru_utime.tv_sec),
					 (long) (r.ru_utime.tv_usec - Save_r.ru_utime.tv_usec),
					 (long) (r.ru_stime.tv_sec - Save_r.ru_stime.tv_sec),
					 (long) (r.ru_stime.tv_usec - Save_r.ru_stime.tv_usec),
					 (long) (elapse_t.tv_sec - Save_t.tv_sec),
					 (long) (elapse_t.tv_usec - Save_t.tv_usec));
	appendStringInfo(&str,
					 "!\t[%ld.%06ld s user, %ld.%06ld s system total]\n",
					 (long) user.tv_sec,
					 (long) user.tv_usec,
					 (long) sys.tv_sec,
					 (long) sys.tv_usec);
#if defined(HAVE_GETRUSAGE)
	appendStringInfo(&str,
					 "!\t%ld kB max resident size\n",
#if defined(__darwin__)
	/* in bytes on macOS */
					 r.ru_maxrss / 1024
#else
	/* in kilobytes on most other platforms */