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#include <assert.h>
#include <malloc.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
static size_t _rand() {
static __thread size_t seed = 123456789;
size_t a = 1103515245;
size_t c = 12345;
size_t m = 1 << 31;
seed = (a * seed + c) % m;
return seed;
}
/*
* Available Benchmarks:
* 1.x: do malloc()/free() in a loop
* 1: simple loop
* 1.1: keep num_kept_allocations befor freeing
* 1.2: keep num_kept_allocations then free all stored
*/
typedef struct ThreadArgs {
double benchmark;
int allocations;
int num_kept_allocations;
int max_size;
} ThreadArgs;
static void* malloc_then_write(size_t size) {
void* ptr = malloc(size);
// Write to ptr
*((char*)ptr) = '!';
return ptr;
}
static void read_then_free(void* ptr) {
// Read before free
char s __attribute__((unused)) = *((char*)ptr);
free(ptr);
}
static void* test_thread_func(void* arg) {
ThreadArgs* args = (ThreadArgs*)arg;
void** ptrs = (void**)calloc(args->num_kept_allocations, sizeof(void*));
for(int i = 0; i < args->allocations; i++) {
int pos = i % args->num_kept_allocations;
if (args->benchmark == 1.1) {
if (i >= args->num_kept_allocations) {
read_then_free(ptrs[pos]);
}
}
if (args->benchmark == 1.2) {
if (pos == 0 && ptrs[pos] != NULL) {
for (int y = 0; y < args->num_kept_allocations; y++) {
read_then_free(ptrs[y]);
}
}
}
ptrs[pos] = malloc_then_write((_rand() % args->max_size) + 1);
if (args->benchmark == 1.0) {
read_then_free(ptrs[pos]);
}
}
return NULL;
}
int main(int argc, char* argv[]) {
pthread_t* threads;
int num_threads;
struct ThreadArgs thread_args;
if (argc < 6) {
fprintf(stderr, "Usage: %s <benchmark> <num threads> <num allocations> <max size> <num of stored allocations>\n", argv[0]);
return 1;
}
thread_args.benchmark = atof(argv[1]);
num_threads = atoi(argv[2]);
thread_args.allocations = atoi(argv[3]);
thread_args.max_size = atoi(argv[4]);
thread_args.num_kept_allocations = atoi(argv[5]);
threads = (pthread_t*)malloc(num_threads * sizeof(pthread_t));
for (int i = 0; i < num_threads; i++) {
if (0 != pthread_create(&threads[i], NULL, test_thread_func, &thread_args)) {
perror("pthread_create");
return 1;
}
}
for(int i = 0; i < num_threads; i++) {
if (0 != pthread_join(threads[i], NULL)) {
perror("pthread_join");
return 1;
}
}
FILE* f = stdout;
if (argc == 7)
f = fopen(argv[6], "w");
malloc_info(0, f);
if (argc == 7)
fclose(f);
return 0;
}
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