cachebench的核心代码
时间: 2023-12-09 10:03:45 浏览: 20
以下是cachebench的核心代码,包括对不同类型缓存的读写测试和性能统计:
```c
void test_cache(char* name, void* cache, int size, int count)
{
printf("Testing %s cache...\n", name);
// Test read cache
printf("Testing read...\n");
clock_t start = clock();
for (int i = 0; i < count; i++) {
for (int j = 0; j < size; j++) {
volatile char c = *(char*)(cache + j);
}
}
clock_t end = clock();
double elapsed_time = ((double)(end - start)) / CLOCKS_PER_SEC;
printf("Read time: %f seconds\n", elapsed_time);
// Test write cache
printf("Testing write...\n");
start = clock();
for (int i = 0; i < count; i++) {
for (int j = 0; j < size; j++) {
*(char*)(cache + j) = (char)i;
}
}
end = clock();
elapsed_time = ((double)(end - start)) / CLOCKS_PER_SEC;
printf("Write time: %f seconds\n", elapsed_time);
}
int main(int argc, char** argv)
{
int size = 1024 * 1024;
int count = 10000;
char* mem = malloc(size);
memset(mem, 0, size);
test_cache("L1", mem, size, count);
int level = get_cache_level(2);
if (level >= 0) {
char* cache = get_cache(level);
test_cache("L2", cache, size, count);
}
level = get_cache_level(3);
if (level >= 0) {
char* cache = get_cache(level);
test_cache("L3", cache, size, count);
}
free(mem);
return 0;
}
```
在主函数中,首先分配了一个指定大小的缓存,并初始化为0。然后使用`test_cache`函数对不同级别的缓存进行读写测试。`test_cache`函数中,先测试读取缓存的性能,然后测试写入缓存的性能,最后输出测试结果。`get_cache_level`和`get_cache`函数用于获取指定级别的缓存地址。
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