cosmopolitan/libc/testlib/ezbenchcontrol.c
Justine Tunney 2ab9e9f7fd
Make improvements
- Introduce portable sched_getcpu() api
- Support GCC's __target_clones__ feature
- Make fma() go faster on x86 in default mode
- Remove some asan checks from core libraries
- WinMain() now ensures $HOME and $USER are defined
2024-02-12 10:23:00 -08:00

55 lines
2.9 KiB
C

/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/fmt/itoa.h"
#include "libc/intrin/kprintf.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/testlib/ezbench.h"
#include "libc/testlib/testlib.h"
static bool once;
static double g_ezbenchcontrol;
double __testlib_ezbenchcontrol(void) {
char host[64];
char ibuf[12];
int Core, Tries, Interrupts;
if (!once) {
Tries = 0;
do {
__testlib_yield();
Core = __testlib_getcore();
Interrupts = __testlib_getinterrupts();
g_ezbenchcontrol =
BENCHLOOP(__startbench, __endbench, 128, donothing, (void)0);
} while (++Tries < 10 && (__testlib_getcore() != Core &&
__testlib_getinterrupts() > Interrupts));
if (Tries == 10) {
tinyprint(2, "warning: failed to accurately benchmark control\n", NULL);
}
strcpy(host, "unknown");
gethostname(host, 64);
FormatInt32(ibuf, g_ezbenchcontrol);
tinyprint(2, "benchmarks on ", host, " (", __describe_os(),
"; overhead of ", ibuf, " cycles)\n", NULL);
once = true;
}
return g_ezbenchcontrol;
}