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robzr/sequential_disk_benchmarking.md

Last active February 7, 2018 23:29
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Sequential disk benchmarking on Linux with dd
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sequential_disk_benchmarking.md

Setup your benchmark parameters:

BM_FILE=./benchmark_data.$$
BM_SIZE=10 # in GB

Write the file:

sync && echo 3 > /proc/sys/vm/drop_caches && dd if=/dev/zero of="$BM_FILE" bs=1G count=$BM_SIZE conv=fdatasync

Clear the pagecache, dentries and inode buffers, then read the file:

sync && echo 3 > /proc/sys/vm/drop_caches && dd if="$BM_FILE" of=/dev/null bs=1G count=$BM_SIZE

And of course, don't forget to clean it up when you're done:

rm -f "$BM_FILE"
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