printf("lvl 1: %ld\n",sysconf(_SC_LEVEL1_DCACHE_SIZE) / sysconf(_SC_LEVEL1_DCACHE_LINESIZE));
    printf("lvl 2: %ld\n",sysconf(_SC_LEVEL2_CACHE_SIZE) / sysconf(_SC_LEVEL2_CACHE_LINESIZE));
    printf("lvl 3: %ld\n",sysconf(_SC_LEVEL3_CACHE_SIZE) / sysconf(_SC_LEVEL3_CACHE_LINESIZE));