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/* Skeleton for benchmark programs.
Copyright (C) 2013-2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <time.h>
#include <inttypes.h>
#include "bench-timing.h"
#include "json-lib.h"
#include "bench-util.h"
#include "bench-util.c"
#define TIMESPEC_AFTER(a, b) \
(((a).tv_sec == (b).tv_sec) \
? ((a).tv_nsec > (b).tv_nsec) \
: ((a).tv_sec > (b).tv_sec))
int
main (int argc, char **argv)
{
unsigned long i, k;
struct timespec runtime;
timing_t start, end;
bool detailed = false;
json_ctx_t json_ctx;
if (argc == 2 && !strcmp (argv[1], "-d"))
detailed = true;
bench_start ();
memset (&runtime, 0, sizeof (runtime));
unsigned long iters = 2000;
#ifdef BENCH_INIT
BENCH_INIT ();
#endif
json_init (&json_ctx, 2, stdout);
/* Begin function. */
json_attr_object_begin (&json_ctx, FUNCNAME);
for (int v = 0; v < NUM_VARIANTS; v++)
{
/* Run for approximately DURATION seconds. */
clock_gettime (CLOCK_MONOTONIC_RAW, &runtime);
runtime.tv_sec += DURATION;
bool is_bench = strncmp (VARIANT (v), "workload-", 9) == 0;
double d_total_i = 0;
timing_t total = 0, max = 0, min = 0x7fffffffffffffff;
timing_t throughput = 0, latency = 0;
int64_t c = 0;
uint64_t cur;
BENCH_VARS;
while (1)
{
if (is_bench)
{
/* Benchmark a real trace of calls - all samples are iterated
over once before repeating. This models actual use more
accurately than repeating the same sample many times. */
TIMING_NOW (start);
for (k = 0; k < iters; k++)
for (i = 0; i < NUM_SAMPLES (v); i++)
BENCH_FUNC (v, i);
TIMING_NOW (end);
TIMING_DIFF (cur, start, end);
TIMING_ACCUM (throughput, cur);
TIMING_NOW (start);
for (k = 0; k < iters; k++)
for (i = 0; i < NUM_SAMPLES (v); i++)
BENCH_FUNC_LAT (v, i);
TIMING_NOW (end);
TIMING_DIFF (cur, start, end);
TIMING_ACCUM (latency, cur);
d_total_i += iters * NUM_SAMPLES (v);
}
else
for (i = 0; i < NUM_SAMPLES (v); i++)
{
TIMING_NOW (start);
for (k = 0; k < iters; k++)
BENCH_FUNC (v, i);
TIMING_NOW (end);
TIMING_DIFF (cur, start, end);
if (cur > max)
max = cur;
if (cur < min)
min = cur;
TIMING_ACCUM (total, cur);
/* Accumulate timings for the value. In the end we will divide
by the total iterations. */
RESULT_ACCUM (cur, v, i, c * iters, (c + 1) * iters);
d_total_i += iters;
}
c++;
struct timespec curtime;
memset (&curtime, 0, sizeof (curtime));
clock_gettime (CLOCK_MONOTONIC_RAW, &curtime);
if (TIMESPEC_AFTER (curtime, runtime))
goto done;
}
double d_total_s;
double d_iters;
done:
d_total_s = total;
d_iters = iters;
/* Begin variant. */
json_attr_object_begin (&json_ctx, VARIANT (v));
if (is_bench)
{
json_attr_double (&json_ctx, "duration", throughput + latency);
json_attr_double (&json_ctx, "iterations", 2 * d_total_i);
json_attr_double (&json_ctx, "reciprocal-throughput",
throughput / d_total_i);
json_attr_double (&json_ctx, "latency", latency / d_total_i);
json_attr_double (&json_ctx, "max-throughput",
d_total_i / throughput * 1000000000.0);
json_attr_double (&json_ctx, "min-throughput",
d_total_i / latency * 1000000000.0);
}
else
{
json_attr_double (&json_ctx, "duration", d_total_s);
json_attr_double (&json_ctx, "iterations", d_total_i);
json_attr_double (&json_ctx, "max", max / d_iters);
json_attr_double (&json_ctx, "min", min / d_iters);
json_attr_double (&json_ctx, "mean", d_total_s / d_total_i);
}
if (detailed && !is_bench)
{
json_array_begin (&json_ctx, "timings");
for (int i = 0; i < NUM_SAMPLES (v); i++)
json_element_double (&json_ctx, RESULT (v, i));
json_array_end (&json_ctx);
}
/* End variant. */
json_attr_object_end (&json_ctx);
}
/* End function. */
json_attr_object_end (&json_ctx);
return 0;
}
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