228 lines
6.2 KiB
C
228 lines
6.2 KiB
C
/* ----------------------------------------------------------------------------
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Copyright (c) 2018,2019 Microsoft Research, Daan Leijen
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This is free software; you can redistribute it and/or modify it under the
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terms of the MIT license.
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-----------------------------------------------------------------------------*/
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/* This is a stress test for the allocator, using multiple threads and
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transferring objects between threads. This is not a typical workload
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but uses a random linear size distribution. Do not use this test as a benchmark!
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <string.h>
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#include <mimalloc.h>
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// argument defaults
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static int THREADS = 32; // more repeatable if THREADS <= #processors
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static int N = 10; // scaling factor
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// static int THREADS = 8; // more repeatable if THREADS <= #processors
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// static int N = 100; // scaling factor
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#define TRANSFERS (1000)
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static volatile void* transfer[TRANSFERS];
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#if (UINTPTR_MAX != UINT32_MAX)
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const uintptr_t cookie = 0xbf58476d1ce4e5b9UL;
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#else
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const uintptr_t cookie = 0x1ce4e5b9UL;
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#endif
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static void* atomic_exchange_ptr(volatile void** p, void* newval);
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typedef uintptr_t* random_t;
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static uintptr_t pick(random_t r) {
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uintptr_t x = *r;
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#if (UINTPTR_MAX > UINT32_MAX)
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// by Sebastiano Vigna, see: <http://xoshiro.di.unimi.it/splitmix64.c>
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x ^= x >> 30;
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x *= 0xbf58476d1ce4e5b9UL;
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x ^= x >> 27;
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x *= 0x94d049bb133111ebUL;
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x ^= x >> 31;
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#else
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// by Chris Wellons, see: <https://nullprogram.com/blog/2018/07/31/>
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x ^= x >> 16;
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x *= 0x7feb352dUL;
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x ^= x >> 15;
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x *= 0x846ca68bUL;
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x ^= x >> 16;
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#endif
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*r = x;
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return x;
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}
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static bool chance(size_t perc, random_t r) {
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return (pick(r) % 100 <= perc);
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}
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static void* alloc_items(size_t items, random_t r) {
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if (chance(1, r)) items *= 100; // 1% huge objects;
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if (items==40) items++; // pthreads uses that size for stack increases
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uintptr_t* p = (uintptr_t*)mi_malloc(items*sizeof(uintptr_t));
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for (uintptr_t i = 0; i < items; i++) p[i] = (items - i) ^ cookie;
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return p;
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}
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static void free_items(void* p) {
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if (p != NULL) {
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uintptr_t* q = (uintptr_t*)p;
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uintptr_t items = (q[0] ^ cookie);
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for (uintptr_t i = 0; i < items; i++) {
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if ((q[i]^cookie) != items - i) {
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fprintf(stderr, "memory corruption at block %p at %zu\n", p, i);
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abort();
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}
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}
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}
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mi_free(p);
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}
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static void stress(intptr_t tid) {
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//bench_start_thread();
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uintptr_t r = tid ^ 42;
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const size_t max_item = 128; // in words
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const size_t max_item_retained = 10*max_item;
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size_t allocs = 25*N*(tid%8 + 1); // some threads do more
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size_t retain = allocs/2;
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void** data = NULL;
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size_t data_size = 0;
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size_t data_top = 0;
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void** retained = (void**)mi_malloc(retain*sizeof(void*));
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size_t retain_top = 0;
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while (allocs>0 || retain>0) {
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if (retain == 0 || (chance(50, &r) && allocs > 0)) {
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// 50%+ alloc
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allocs--;
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if (data_top >= data_size) {
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data_size += 100000;
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data = (void**)mi_realloc(data, data_size*sizeof(void*));
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}
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data[data_top++] = alloc_items((pick(&r) % max_item) + 1, &r);
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}
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else {
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// 25% retain
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retained[retain_top++] = alloc_items(10*((pick(&r) % max_item_retained) + 1), &r);
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retain--;
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}
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if (chance(66, &r) && data_top > 0) {
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// 66% free previous alloc
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size_t idx = pick(&r) % data_top;
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free_items(data[idx]);
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data[idx] = NULL;
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}
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if (chance(25, &r) && data_top > 0) {
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// 25% transfer-swap
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size_t data_idx = pick(&r) % data_top;
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size_t transfer_idx = pick(&r) % TRANSFERS;
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void* p = data[data_idx];
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void* q = atomic_exchange_ptr(&transfer[transfer_idx], p);
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data[data_idx] = q;
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}
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}
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// free everything that is left
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for (size_t i = 0; i < retain_top; i++) {
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free_items(retained[i]);
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}
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for (size_t i = 0; i < data_top; i++) {
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free_items(data[i]);
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}
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mi_free(retained);
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mi_free(data);
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//bench_end_thread();
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}
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static void run_os_threads(size_t nthreads);
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int main(int argc, char** argv) {
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if (argc>=2) {
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char* end;
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long n = strtol(argv[1], &end, 10);
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if (n > 0) THREADS = n;
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}
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if (argc>=3) {
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char* end;
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long n = (strtol(argv[2], &end, 10));
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if (n > 0) N = n;
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}
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printf("start with %i threads with a %i%% load-per-thread\n", THREADS, N);
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//int res = mi_reserve_huge_os_pages(4,1);
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//printf("(reserve huge: %i\n)", res);
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//bench_start_program();
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memset((void*)transfer, 0, TRANSFERS*sizeof(void*));
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run_os_threads(THREADS);
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for (int i = 0; i < TRANSFERS; i++) {
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free_items((void*)transfer[i]);
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}
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mi_collect(false);
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mi_collect(true);
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mi_stats_print(NULL);
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//bench_end_program();
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return 0;
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}
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#ifdef _WIN32
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#include <windows.h>
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static DWORD WINAPI thread_entry(LPVOID param) {
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stress((intptr_t)param);
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return 0;
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}
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static void run_os_threads(size_t nthreads) {
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DWORD* tids = (DWORD*)malloc(nthreads * sizeof(DWORD));
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HANDLE* thandles = (HANDLE*)malloc(nthreads * sizeof(HANDLE));
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for (uintptr_t i = 0; i < nthreads; i++) {
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thandles[i] = CreateThread(0, 4096, &thread_entry, (void*)(i), 0, &tids[i]);
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}
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for (size_t i = 0; i < nthreads; i++) {
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WaitForSingleObject(thandles[i], INFINITE);
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}
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}
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static void* atomic_exchange_ptr(volatile void** p, void* newval) {
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#if (INTPTR_MAX == UINT32_MAX)
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return (void*)InterlockedExchange((volatile LONG*)p, (LONG)newval);
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#else
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return (void*)InterlockedExchange64((volatile LONG64*)p, (LONG64)newval);
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#endif
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}
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#else
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#include <pthread.h>
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#include <stdatomic.h>
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static void* thread_entry(void* param) {
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stress((uintptr_t)param);
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return NULL;
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}
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static void run_os_threads(size_t nthreads) {
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pthread_t* threads = (pthread_t*)mi_malloc(nthreads*sizeof(pthread_t));
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memset(threads, 0, sizeof(pthread_t)*nthreads);
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//pthread_setconcurrency(nthreads);
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for (uintptr_t i = 0; i < nthreads; i++) {
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pthread_create(&threads[i], NULL, &thread_entry, (void*)i);
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}
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for (size_t i = 0; i < nthreads; i++) {
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pthread_join(threads[i], NULL);
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}
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}
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static void* atomic_exchange_ptr(volatile void** p, void* newval) {
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return atomic_exchange_explicit((volatile _Atomic(void*)*)p, newval, memory_order_acquire);
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}
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#endif
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