Spdk/test/app/histogram_perf/histogram_perf.c

/*   SPDX-License-Identifier: BSD-3-Clause
 *   Copyright (C) 2017 Intel Corporation.
 *   All rights reserved.
 */

#include "spdk/stdinc.h"

#include "spdk/env.h"
#include "spdk/util.h"
#include "spdk/histogram_data.h"

/*
 * This applications is a simple test app used to test the performance of
 *  tallying datapoints with struct spdk_histogram_data.  It can be used
 *  to measure the effect of changes to the spdk_histogram_data implementation.
 *
 * There are no command line parameters currently - it just tallies
 *  datapoints for 10 seconds in a default-sized histogram structure and
 *  then prints out the number of tallies performed.
 */

static void
usage(const char *prog)
{
	printf("usage: %s\n", prog);
	printf("Options:\n");
}

int
main(int argc, char **argv)
{
	struct spdk_histogram_data *h;
	struct spdk_env_opts opts;
	uint64_t tsc[128], t, end_tsc, count;
	uint32_t i;
	int ch;
	int rc = 0;

	while ((ch = getopt(argc, argv, "")) != -1) {
		switch (ch) {
		default:
			usage(argv[0]);
			return 1;
		}
	}

	spdk_env_opts_init(&opts);
	if (spdk_env_init(&opts)) {
		printf("Err: Unable to initialize SPDK env\n");
		return 1;
	}

	for (i = 0; i < SPDK_COUNTOF(tsc); i++) {
		tsc[i] = spdk_get_ticks();
	}

	end_tsc = spdk_get_ticks() + (10 * spdk_get_ticks_hz());
	count = 0;
	h = spdk_histogram_data_alloc();

	while (true) {
		t = spdk_get_ticks();
		spdk_histogram_data_tally(h, t - tsc[count % 128]);
		count++;
		if (t > end_tsc) {
			break;
		}
	}

	printf("count = %ju\n", count);
	spdk_histogram_data_free(h);

	spdk_env_fini();
	return rc;
}