mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
e398f3887c
- NetBSD should now have faster synchronization - POSIX barriers may now be shared across processes - An edge case with memory map tracking has been fixed - Grand Central Dispatch is no longer used on MacOS ARM64 - POSIX mutexes in normal mode now use futexes across processes
236 lines
7.2 KiB
C
236 lines
7.2 KiB
C
#include <assert.h>
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#include <cosmo.h>
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#include <linux/futex.h>
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#include <pthread.h>
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#include <stdatomic.h>
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#include <stdio.h>
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#include <sys/resource.h>
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#include <sys/syscall.h>
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#include <time.h>
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#include <unistd.h>
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#include "third_party/nsync/futex.internal.h"
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// THIS IS AN EXAMPLE OF HOW TO USE COSMOPOLITAN FUTEXES TO IMPLEMENT
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// YOUR OWN MUTEXES FROM SCRATCH. LOOK AT HOW MUCH BETTER THIS IT CAN
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// MAKE THINGS COMPARED TO SPIN LOCKS. ALGORITHM FROM ULRICH DREPPER.
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// arm fleet
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// with futexes
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// 30 threads / 100000 iterations
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//
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// 242,604 us real
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// 4,222,946 us user
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// 1,079,229 us sys
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// footek_test on studio.test. 630 µs 17'415 µs 256'782 µs
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// 1,362,557 us real
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// 3,232,978 us user
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// 2,104,824 us sys
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// footek_test on pi.test. 611 µs 21'708 µs 1'385'129 µs
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// 1,346,482 us real
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// 3,370,513 us user
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// 1,992,383 us sys
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// footek_test on freebsdarm.test. 427 µs 19'967 µs 1'393'476 µs
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// arm fleet
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// without futexes
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// 30 threads / 100000 iterations
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//
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// 1,282,084 us real
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// 29,359,582 us user
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// 34,553 us sys
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// footek_test on studio.test. 961 µs 12'907 µs 1'287'983 µs
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// 4,070,988 us real
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// 16,203,990 us user
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// 7,999 us sys
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// footek_test on pi.test. 459 µs 16'376 µs 4'095'512 µs
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// 7,012,493 us real
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// 27,936,725 us user
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// 7,871 us sys
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// footek_test on freebsdarm.test. 502 µs 16'446 µs 7'051'545 µs
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// x86 fleet
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// with futexes
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// 30 threads / 100000 iterations
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//
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// 146,015 us real
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// 169,427 us user
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// 68,939 us sys
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// footek_test on rhel7.test. 376 µs 2'259 µs 153'024 µs
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// 144,917 us real
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// 383,317 us user
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// 191,203 us sys
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// footek_test on xnu.test. 11'143 µs 9'159 µs 164'865 µs
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// 244,286 us real
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// 405,395 us user
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// 956,122 us sys
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// footek_test on freebsd.test. 394 µs 2'165 µs 256'227 µs
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// 209,095 us real
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// 616,634 us user
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// 9,945 us sys
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// footek_test on netbsd.test. 502 µs 2'020 µs 261'895 µs
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// 344,876 us real
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// 50,000 us user
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// 1,240,000 us sys
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// footek_test on openbsd.test. 457 µs 2'737 µs 396'342 µs
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// 1,193,906 us real
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// 17,546,875 us user
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// 3,000,000 us sys
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// footek_test on win10.test. 462 µs 59'528 µs 1'348'265 µs
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// x86 fleet
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// without futexes
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// 30 threads / 100000 iterations
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//
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// 897,815 us real
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// 1,763,705 us user
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// 9,696 us sys
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// footek_test on rhel7.test. 423 µs 2'638 µs 912'241 µs
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// 790,332 us real
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// 2,359,967 us user
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// 0 us sys
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// footek_test on netbsd.test. 1'151 µs 2'634 µs 1'014'867 µs
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// 2,332,724 us real
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// 9,150,000 us user
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// 10,000 us sys
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// footek_test on openbsd.test. 557 µs 3'020 µs 2'554'648 µs
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// 2,528,863 us real
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// 56,546,875 us user
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// 1,671,875 us sys
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// footek_test on win10.test. 962 µs 9'698 µs 2'751'905 µs
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// 2,916,033 us real
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// 17,236,103 us user
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// 0 us sys
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// footek_test on freebsd.test. 690 µs 3'011 µs 2'925'997 µs
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// 4,225,726 us real
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// 16,679,456 us user
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// 16,265 us sys
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// footek_test on xnu.test. 98'468 µs 5'242 µs 5'191'724 µs
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#define USE_FUTEX 1
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#define THREADS 30
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#define ITERATIONS 30000
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#define MUTEX_LOCKED(word) ((word) & 8)
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#define MUTEX_WAITING(word) ((word) & 16)
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#define MUTEX_LOCK(word) ((word) | 8)
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#define MUTEX_SET_WAITING(word) ((word) | 16)
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#define MUTEX_UNLOCK(word) ((word) & ~(8 | 16))
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void lock(atomic_int *futex) {
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int word, cs;
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for (int i = 0; i < 4; ++i) {
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word = 0;
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if (atomic_compare_exchange_strong_explicit(
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futex, &word, 1, memory_order_acquire, memory_order_acquire))
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return;
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pthread_pause_np();
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}
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if (word == 1)
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word = atomic_exchange_explicit(futex, 2, memory_order_acquire);
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while (word > 0) {
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pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
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#if USE_FUTEX
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nsync_futex_wait_(futex, 2, 0, 0);
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#endif
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pthread_setcancelstate(cs, 0);
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word = atomic_exchange_explicit(futex, 2, memory_order_acquire);
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}
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}
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void unlock(atomic_int *futex) {
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int word = atomic_fetch_sub_explicit(futex, 1, memory_order_release);
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if (word == 2) {
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atomic_store_explicit(futex, 0, memory_order_release);
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#if USE_FUTEX
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nsync_futex_wake_(futex, 1, 0);
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#endif
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}
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}
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int g_chores;
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atomic_int g_lock;
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pthread_mutex_t g_locker;
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void *worker(void *arg) {
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for (int i = 0; i < ITERATIONS; ++i) {
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lock(&g_lock);
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++g_chores;
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unlock(&g_lock);
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}
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return 0;
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}
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int main() {
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struct timeval start;
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gettimeofday(&start, 0);
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pthread_t th[THREADS];
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for (int i = 0; i < THREADS; ++i)
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pthread_create(&th[i], 0, worker, 0);
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for (int i = 0; i < THREADS; ++i)
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pthread_join(th[i], 0);
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npassert(g_chores == THREADS * ITERATIONS);
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struct rusage ru;
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struct timeval end;
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gettimeofday(&end, 0);
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getrusage(RUSAGE_SELF, &ru);
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printf("%,16ld us real\n"
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"%,16ld us user\n"
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"%,16ld us sys\n",
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timeval_tomicros(timeval_sub(end, start)), //
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timeval_tomicros(ru.ru_utime), //
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timeval_tomicros(ru.ru_stime));
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CheckForMemoryLeaks();
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}
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// COMPARE ULRICH DREPPER'S LOCKING ALGORITHM WITH MIKE BURROWS *NSYNC
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// WHICH IS WHAT COSMOPOLITAN LIBC USES FOR YOUR POSIX THREADS MUTEXES
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// x86 fleet
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// with pthread_mutex_t
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// 30 threads / 100000 iterations
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//
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// 186,976 us real
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// 43,609 us user
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// 205,585 us sys
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// footek_test on freebsd.test. 410 µs 2'054 µs 195'339 µs
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// 238,902 us real
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// 235,743 us user
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// 97,881 us sys
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// footek_test on rhel7.test. 343 µs 2'339 µs 246'926 µs
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// 201,285 us real
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// 249,612 us user
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// 141,230 us sys
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// footek_test on xnu.test. 1'960 µs 5'350 µs 265'758 µs
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// 303,363 us real
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// 60,000 us user
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// 410,000 us sys
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// footek_test on openbsd.test. 545 µs 3'023 µs 326'200 µs
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// 386,085 us real
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// 586,455 us user
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// 466,991 us sys
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// footek_test on netbsd.test. 344 µs 2'421 µs 413'440 µs
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// 245,010 us real
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// 437,500 us user
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// 140,625 us sys
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// footek_test on win10.test. 300 µs 18'574 µs 441'225 µs
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// arm fleet
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// with pthread_mutex_t
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// 30 threads / 100000 iterations
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//
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// 87,132 us real
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// 183,517 us user
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// 20,020 us sys
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// footek_test on studio.test. 560 µs 12'418 µs 92'825 µs
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// 679,374 us real
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// 957,678 us user
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// 605,078 us sys
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// footek_test on pi.test. 462 µs 16'574 µs 702'833 µs
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// 902,343 us real
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// 1,459,706 us user
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// 781,140 us sys
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// footek_test on freebsdarm.test. 400 µs 16'261 µs 970'022 µs
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