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81 lines
2.0 KiB
81 lines
2.0 KiB
// Synthetic benchmark for __tsan_read/write{1,2,4,8}.
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// As compared to mini_bench_local/shared.cc this benchmark passes through
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// deduplication logic (ContainsSameAccess).
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// First argument is access size (1, 2, 4, 8). Second optional arg switches
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// from writes to reads.
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#include <pthread.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <linux/futex.h>
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#include <sys/syscall.h>
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#include <sys/time.h>
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template<typename T, bool write>
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void* thread(void *arg) {
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const int kSize = 2 << 10;
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static volatile long data[kSize];
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static volatile long turn;
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const int kRepeat = 1 << 17;
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const int id = !!arg;
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for (int i = 0; i < kRepeat; i++) {
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for (;;) {
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int t = __atomic_load_n(&turn, __ATOMIC_ACQUIRE);
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if (t == id)
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break;
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syscall(SYS_futex, &turn, FUTEX_WAIT, t, 0, 0, 0);
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}
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for (int j = 0; j < kSize; j++) {
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if (write) {
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((volatile T*)&data[j])[0] = 1;
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((volatile T*)&data[j])[sizeof(T) == 8 ? 0 : 1] = 1;
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} else {
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T v0 = ((volatile T*)&data[j])[0];
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T v1 = ((volatile T*)&data[j])[sizeof(T) == 8 ? 0 : 1];
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(void)v0;
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(void)v1;
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}
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}
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__atomic_store_n(&turn, 1 - id, __ATOMIC_RELEASE);
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syscall(SYS_futex, &turn, FUTEX_WAKE, 0, 0, 0, 0);
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}
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return 0;
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}
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template<typename T, bool write>
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void test() {
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pthread_t th;
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pthread_create(&th, 0, thread<T, write>, (void*)1);
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thread<T, write>(0);
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pthread_join(th, 0);
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}
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template<bool write>
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void testw(int size) {
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switch (size) {
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case 1: return test<char, write>();
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case 2: return test<short, write>();
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case 4: return test<int, write>();
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case 8: return test<long long, write>();
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}
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}
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int main(int argc, char** argv) {
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int size = 8;
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bool write = true;
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if (argc > 1) {
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size = atoi(argv[1]);
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if (size != 1 && size != 2 && size != 4 && size != 8)
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size = 8;
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}
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if (argc > 2)
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write = false;
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printf("%s%d\n", write ? "write" : "read", size);
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if (write)
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testw<true>(size);
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else
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testw<false>(size);
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return 0;
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}
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