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/**
* hdr_histogram_perf.c
* Written by Michael Barker and released to the public domain,
* as explained at http://creativecommons.org/publicdomain/zero/1.0/
*/
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <hdr_histogram.h>
#include <locale.h>
#include "hdr_time.h"
static struct timespec diff(struct timespec start, struct timespec end)
{
struct timespec temp;
if ((end.tv_nsec-start.tv_nsec) < 0)
{
temp.tv_sec = end.tv_sec - start.tv_sec - 1;
temp.tv_nsec = 1000000000 + end.tv_nsec-start.tv_nsec;
}
else
{
temp.tv_sec = end.tv_sec - start.tv_sec;
temp.tv_nsec = end.tv_nsec - start.tv_nsec;
}
return temp;
}
int main()
{
struct hdr_histogram* histogram;
int64_t max_value = INT64_C(24) * 60 * 60 * 1000000;
int64_t min_value = 1;
int result = -1;
result = hdr_init(min_value, max_value, 4, &histogram);
if (result != 0)
{
fprintf(stderr, "Failed to allocate histogram: %d\n", result);
return -1;
}
struct timespec t0;
struct timespec t1;
setlocale(LC_NUMERIC, "");
int64_t iterations = 400000000;
int i;
for (i = 0; i < 100; i++)
{
int64_t j;
hdr_gettime(&t0);
for (j = 1; j < iterations; j++)
{
hdr_record_value(histogram, j);
}
hdr_gettime(&t1);
struct timespec taken = diff(t0, t1);
double time_taken = taken.tv_sec + taken.tv_nsec / 1000000000.0;
double ops_sec = (iterations - 1) / time_taken;
printf("%s - %d, ops/sec: %'.2f\n", "Iteration", i + 1, ops_sec);
}
return 0;
}
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