Benchmarking Tools for Memory Bandwidth


What is Bandwidth

Bandwidth, is an artificial benchmark primarily for measuring memory bandwidth on x86 and x86_64 based computers, useful for identifying weaknesses in a computer’s memory subsystem, in the bus architecture, in the cache architecture and in the processor itself.

bandwidth also tests some libc functions and, under GNU/Linux, it attempts to test framebuffer memory access speed if the framebuffer device is available.

Prerequisites:

NASM, GNU Compiler Suite

Compiling NASM

Bandwidth-1.94 requires the latest version of NASM.

% tar -xvf nasm-2.15.05.tar.gz
% cd nasm-2.15.05
% ./configure
% make
% make install

You should have nasm binary. Make sure you update $PATH to reflect the path of the nasm binary

Compiling Bandwidth-1.94

% tar -zxvf bandwidth-1.9.4.tar.gz
% cd bandwidth-1.9.4
% make bandwidth64

You should have bandwidth64 binary

Run the Test

% ./bandwidth64
Sequential read (64-bit), size = 256 B, loops = 1132462080, 55292.9 MB/s
Sequential read (64-bit), size = 384 B, loops = 765632322, 56075.0 MB/s
Sequential read (64-bit), size = 512 B, loops = 573833216, 56028.0 MB/s
Sequential read (64-bit), size = 640 B, loops = 457595948, 55857.6 MB/s
Sequential read (64-bit), size = 768 B, loops = 382990923, 56092.5 MB/s
Sequential read (64-bit), size = 896 B, loops = 326929770, 55865.7 MB/s
Sequential read (64-bit), size = 1024 B, loops = 285671424, 55789.1 MB/s
Sequential read (64-bit), size = 1280 B, loops = 229320072, 55973.6 MB/s
Sequential read (64-bit), size = 2 kB, loops = 143425536, 56016.5 MB/s
Sequential read (64-bit), size = 3 kB, loops = 95550030, 55977.6 MB/s
Sequential read (64-bit), size = 4 kB, loops = 71729152, 56036.7 MB/s
Sequential read (64-bit), size = 6 kB, loops = 47510700, 55667.7 MB/s
Sequential read (64-bit), size = 8 kB, loops = 35856384, 56020.1 MB/s
Sequential read (64-bit), size = 12 kB, loops = 23738967, 55631.2 MB/s
Sequential read (64-bit), size = 16 kB, loops = 17666048, 55199.2 MB/s
Sequential read (64-bit), size = 20 kB, loops = 14139216, 55228.2 MB/s
Sequential read (64-bit), size = 24 kB, loops = 11771760, 55178.0 MB/s
Sequential read (64-bit), size = 28 kB, loops = 10097100, 55212.2 MB/s
Sequential read (64-bit), size = 32 kB, loops = 8679424, 54246.3 MB/s
Sequential read (64-bit), size = 34 kB, loops = 7160732, 47543.7 MB/s
Sequential read (64-bit), size = 36 kB, loops = 6404580, 45029.4 MB/s
Sequential read (64-bit), size = 40 kB, loops = 5729724, 44762.0 MB/s
Sequential read (64-bit), size = 48 kB, loops = 4782960, 44837.4 MB/s
Sequential read (64-bit), size = 64 kB, loops = 3603456, 45042.9 MB/s
Sequential read (64-bit), size = 128 kB, loops = 1806848, 45168.2 MB/s
Sequential read (64-bit), size = 192 kB, loops = 1204753, 45175.8 MB/s
Sequential read (64-bit), size = 256 kB, loops = 897792, 44882.4 MB/s
Sequential read (64-bit), size = 320 kB, loops = 711144, 44435.3 MB/s
Sequential read (64-bit), size = 384 kB, loops = 590070, 44254.7 MB/s
Sequential read (64-bit), size = 512 kB, loops = 440064, 43995.8 MB/s
Sequential read (64-bit), size = 768 kB, loops = 285005, 42741.0 MB/s
Sequential read (64-bit), size = 1024 kB, loops = 170048, 34006.4 MB/s
Sequential read (64-bit), size = 1280 kB, loops = 120615, 30152.0 MB/s
Sequential read (64-bit), size = 1536 kB, loops = 91434, 27427.4 MB/s
Sequential read (64-bit), size = 1792 kB, loops = 77688, 27180.4 MB/s
Sequential read (64-bit), size = 2048 kB, loops = 64320, 25722.9 MB/s
Sequential read (64-bit), size = 2304 kB, loops = 56252, 25313.3 MB/s
Sequential read (64-bit), size = 2560 kB, loops = 49550, 24772.9 MB/s
Sequential read (64-bit), size = 2816 kB, loops = 47334, 26023.8 MB/s
Sequential read (64-bit), size = 3072 kB, loops = 41916, 25142.8 MB/s
Sequential read (64-bit), size = 3328 kB, loops = 37525, 24388.1 MB/s
Sequential read (64-bit), size = 3584 kB, loops = 35982, 25184.6 MB/s
Sequential read (64-bit), size = 4096 kB, loops = 31824, 25457.4 MB/s
Sequential read (64-bit), size = 5120 kB, loops = 25128, 25116.7 MB/s
Sequential read (64-bit), size = 6144 kB, loops = 22460, 26948.8 MB/s
Sequential read (64-bit), size = 7168 kB, loops = 18081, 25309.1 MB/s
Sequential read (64-bit), size = 8192 kB, loops = 14952, 23921.5 MB/s
Sequential read (64-bit), size = 9216 kB, loops = 13692, 24642.6 MB/s
Sequential read (64-bit), size = 10240 kB, loops = 12144, 24280.2 MB/s
Sequential read (64-bit), size = 12288 kB, loops = 9465, 22713.4 MB/s
Sequential read (64-bit), size = 14336 kB, loops = 7628, 21357.8 MB/s
Sequential read (64-bit), size = 15360 kB, loops = 6580, 19735.0 MB/s
Sequential read (64-bit), size = 16384 kB, loops = 6068, 19413.2 MB/s
Sequential read (64-bit), size = 20480 kB, loops = 3636, 14541.5 MB/s
Sequential read (64-bit), size = 21504 kB, loops = 3741, 15711.6 MB/s
Sequential read (64-bit), size = 32768 kB, loops = 1266, 8102.1 MB/s
Sequential read (64-bit), size = 49152 kB, loops = 900, 8640.0 MB/s
Sequential read (64-bit), size = 65536 kB, loops = 566, 7238.3 MB/s
Sequential read (64-bit), size = 73728 kB, loops = 609, 8765.8 MB/s
Sequential read (64-bit), size = 98304 kB, loops = 455, 8726.8 MB/s
Sequential read (64-bit), size = 131072 kB, loops = 331, 8461.2 MB/s

There is an interesting collection of commentaries at https://zsmith.co/bandwidth.php

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