80 lines
1.6 KiB
C
80 lines
1.6 KiB
C
/* Copyright (c) 2021-2023 Barcelona Supercomputing Center (BSC)
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* SPDX-License-Identifier: GPL-3.0-or-later */
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "instr.h"
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#include "ovni.h"
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static void
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emit(uint8_t *buf, size_t size)
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{
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struct ovni_ev ev = {0};
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ovni_ev_set_mcv(&ev, "OB.");
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ovni_ev_set_clock(&ev, ovni_clock_now());
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ovni_ev_jumbo_emit(&ev, buf, size);
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}
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#define NRUNS 50
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int
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main(void)
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{
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if (setenv("OVNI_TMPDIR", "/dev/shm/ovni-flush-overhead", 1) != 0) {
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perror("setenv failed");
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exit(EXIT_FAILURE);
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}
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instr_start(0, 1);
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/* Use 1 MiB of payload */
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size_t payload_size = 1024 * 1024;
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uint8_t *payload_buf = calloc(1, payload_size);
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if (!payload_buf) {
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perror("calloc failed");
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exit(EXIT_FAILURE);
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}
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double *times = calloc(sizeof(double), NRUNS);
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if (times == NULL) {
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perror("calloc failed");
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exit(EXIT_FAILURE);
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}
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for (int i = 0; i < NRUNS; i++) {
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emit(payload_buf, payload_size);
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double t0 = (double) ovni_clock_now();
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ovni_flush();
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double t1 = (double) ovni_clock_now();
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times[i] = (t1 - t0) * 1e-6; /* to milliseconds */
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}
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double mean = 0.0;
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for (int i = 0; i < NRUNS; i++)
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mean += times[i];
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mean /= (double) NRUNS;
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fprintf(stderr, "mean %f ms\n", mean);
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/* It should be able to write 1 MiB in less than 2 ms */
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if (mean > 2.0) {
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fprintf(stderr, "took too much time to flush: %f ms\n", mean);
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fprintf(stderr, "times (in ms):\n");
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for (int i = 0; i < NRUNS; i++)
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fprintf(stderr, " %4d %f\n", i, times[i]);
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exit(EXIT_FAILURE);
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}
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instr_end();
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free(payload_buf);
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free(times);
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return 0;
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}
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