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cpu benchmark with `dd`.md

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CPU benchmark with dd

'dd' in conjunction with any stream-processing CPU-intensive program can also be used as a simple CPU benchmark! You can run this “out of the box” on any GNU/Linux system as follows:

    dd if=/dev/zero bs=1M count=1024 | md5sum

In this case I used the md5sum program, which calculates the MD5 hash of data that is fed to it. In effect, 'dd' here fetches 1 GB of zeroes from the Linux kernel, feeds that to md5sum, and then prints how fast in MB/sec that was processed. So for example on a modern 3.6 GHz AMD Phenom II CPU:

$ dd if=/dev/zero bs=1M count=1024 | md5sum
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB) copied, 2.28735 s, 469 MB/s
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