/**
* 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 <string.h>
#include "hdr_time.h"
#if defined(_WIN32) || defined(_WIN64) || defined(__CYGWIN__)
#if !defined(WIN32_LEAN_AND_MEAN)
#define WIN32_LEAN_AND_MEAN
#endif
#include <windows.h>
#define snprintf sprintf_s
#endif
static hdr_timespec diff(hdr_timespec start, hdr_timespec end)
{
hdr_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;
}
/* Formats the given double with 2 dps, and , thousand separators */
static char *format_double(double d)
{
int p;
static char buffer[30];
snprintf(buffer, sizeof(buffer), "%0.2f", d);
p = (int) strlen(buffer) - 6;
while (p > 0)
{
memmove(&buffer[p + 1], &buffer[p], strlen(buffer) - p + 1);
buffer[p] = ',';
p = p - 3;
}
return buffer;
}
int main()
{
struct hdr_histogram* histogram;
hdr_timespec t0, t1;
int result, i;
int64_t iterations;
int64_t max_value = INT64_C(24) * 60 * 60 * 1000000;
int64_t min_value = 1;
result = hdr_init(min_value, max_value, 4, &histogram);
if (result != 0)
{
fprintf(stderr, "Failed to allocate histogram: %d\n", result);
return -1;
}
iterations = 400000000;
for (i = 0; i < 100; i++)
{
int64_t j;
hdr_timespec taken;
double time_taken, ops_sec;
hdr_gettime(&t0);
for (j = 1; j < iterations; j++)
{
hdr_record_value(histogram, j);
}
hdr_gettime(&t1);
taken = diff(t0, t1);
time_taken = taken.tv_sec + taken.tv_nsec / 1000000000.0;
ops_sec = (iterations - 1) / time_taken;
printf("%s - %d, ops/sec: %s\n", "Iteration", i + 1, format_double(ops_sec));
}
return 0;
}