107 lines
2.0 KiB
C
107 lines
2.0 KiB
C
/* Copyright (c) 2021-2022 Barcelona Supercomputing Center (BSC)
|
|
* SPDX-License-Identifier: GPL-3.0-or-later */
|
|
|
|
#define _POSIX_C_SOURCE 200112L
|
|
#define _GNU_SOURCE
|
|
|
|
#include <limits.h>
|
|
#include <linux/limits.h>
|
|
#include <stddef.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <sys/syscall.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
#include "compat.h"
|
|
#include "ovni.h"
|
|
|
|
static inline void
|
|
init(void)
|
|
{
|
|
char hostname[HOST_NAME_MAX];
|
|
|
|
if (gethostname(hostname, HOST_NAME_MAX) != 0) {
|
|
perror("gethostname failed");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
ovni_proc_init(0, hostname, getpid());
|
|
ovni_thread_init(gettid());
|
|
ovni_add_cpu(0, 0);
|
|
}
|
|
|
|
static void
|
|
emit(uint8_t *buf, size_t size)
|
|
{
|
|
struct ovni_ev ev = {0};
|
|
ovni_ev_set_mcv(&ev, "O$$");
|
|
ovni_ev_set_clock(&ev, ovni_clock_now());
|
|
ovni_ev_jumbo_emit(&ev, buf, size);
|
|
}
|
|
|
|
#define NRUNS 50
|
|
|
|
int
|
|
main(void)
|
|
{
|
|
size_t payload_size;
|
|
uint8_t *payload_buf;
|
|
|
|
if (setenv("OVNI_TMPDIR", "/dev/shm/ovni-flush-overhead", 1) != 0) {
|
|
perror("setenv failed");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
init();
|
|
|
|
/* Use 1 MiB of payload */
|
|
payload_size = 1024 * 1024;
|
|
payload_buf = calloc(1, payload_size);
|
|
|
|
if (!payload_buf) {
|
|
perror("calloc failed");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
double *times = calloc(sizeof(double), NRUNS);
|
|
if (times == NULL) {
|
|
perror("calloc failed");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
for (int i = 0; i < NRUNS; i++) {
|
|
emit(payload_buf, payload_size);
|
|
double t0 = (double) ovni_clock_now();
|
|
ovni_flush();
|
|
double t1 = (double) ovni_clock_now();
|
|
|
|
times[i] = (t1 - t0) * 1e-6; /* to milliseconds */
|
|
}
|
|
|
|
double mean = 0.0;
|
|
for (int i = 0; i < NRUNS; i++)
|
|
mean += times[i];
|
|
mean /= (double) NRUNS;
|
|
|
|
fprintf(stderr, "mean %f ms\n", mean);
|
|
|
|
/* It should be able to write 1 MiB in less than 1 ms */
|
|
if (mean > 1.0) {
|
|
fprintf(stderr, "took too much time to flush: %f ms\n", mean);
|
|
|
|
fprintf(stderr, "times (in ms):\n");
|
|
for (int i = 0; i < NRUNS; i++)
|
|
fprintf(stderr, " %4d %f\n", i, times[i]);
|
|
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
ovni_proc_fini();
|
|
|
|
free(payload_buf);
|
|
free(times);
|
|
|
|
return 0;
|
|
}
|