linux_dsm_epyc7002/tools/testing/selftests/powerpc/benchmarks/futex_bench.c
Michael Ellerman 0c63e8b7b9 selftests/powerpc: Import Anton's mmap & futex micro benchmarks
These are useful little loops for smoke testing performance.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-07-05 23:49:50 +10:00

43 lines
802 B
C

/*
* Copyright 2016, Anton Blanchard, Michael Ellerman, IBM Corp.
* Licensed under GPLv2.
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <sys/syscall.h>
#include <time.h>
#include <unistd.h>
#include <linux/futex.h>
#include "utils.h"
#define ITERATIONS 100000000
#define futex(A, B, C, D, E, F) syscall(__NR_futex, A, B, C, D, E, F)
int test_futex(void)
{
struct timespec ts_start, ts_end;
unsigned long i = ITERATIONS;
clock_gettime(CLOCK_MONOTONIC, &ts_start);
while (i--) {
unsigned int addr = 0;
futex(&addr, FUTEX_WAKE, 1, NULL, NULL, 0);
}
clock_gettime(CLOCK_MONOTONIC, &ts_end);
printf("time = %.6f\n", ts_end.tv_sec - ts_start.tv_sec + (ts_end.tv_nsec - ts_start.tv_nsec) / 1e9);
return 0;
}
int main(void)
{
return test_harness(test_futex, "futex_bench");
}