mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
07cef612c3
This change adds a TLS freelist for small dynamic memory allocations.
Cosmopolitan's TIB is now 512 bytes in size. Single-threaded malloc()
performance isn't impacted by this, until pthread_create() is called.
Single-threaded programs may also want to consider using:
#include "libc/mem/tinymalloc.inc"
Which will shave 30k off the executable size and sometimes go faster.
79 lines
3.4 KiB
C++
79 lines
3.4 KiB
C++
/*-*-mode:c++;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8-*-│
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│ vi: set et ft=c++ ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2024 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/thread/thread.h"
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#include "libc/assert.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/timespec.h"
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#include "libc/fmt/itoa.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/rand.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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//
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// BEFORE ADDING TLS FREELIST
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//
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// malloc multithreading torture test
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// with 192 threads and 10000 iterations
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// consumed 0.084721 wall and 0.141747 cpu seconds
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//
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// AFTER ADDING TLS FREELIST
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//
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// malloc multithreading torture test
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// with 192 threads and 10000 iterations
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// consumed 0.035193 wall and 4.34012 cpu seconds
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//
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#define ITERATIONS 10000
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void *Worker(void *arg) {
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char *thing[32] = {};
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for (int i = 0; i < ITERATIONS; ++i) {
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int r = rand();
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int j = r % ARRAYLEN(thing);
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if (thing[j]) {
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delete[] thing[j];
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thing[j] = 0;
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} else {
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thing[j] = new char[12 + ((r >> 8) % 32)];
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}
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}
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return 0;
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}
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int main(int argc, char *argv[]) {
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int n = __get_cpu_count();
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pthread_t *t = new pthread_t[n];
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fprintf(stderr,
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"\n"
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"malloc multithreading torture test\n"
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"with %d threads and %d iterations\n",
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n, ITERATIONS);
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struct timespec t1 = timespec_real();
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for (int i = 0; i < n; ++i)
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unassert(!pthread_create(t + i, 0, Worker, 0));
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for (int i = 0; i < n; ++i)
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unassert(!pthread_join(t[i], 0));
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struct timespec t2 = timespec_real();
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fprintf(stderr, "consumed %g wall and %g cpu seconds\n",
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timespec_tomicros(timespec_sub(t2, t1)) * 1e-6,
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(double)clock() / CLOCKS_PER_SEC);
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delete[] t;
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}
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