dd command test read and write speed of disk in linux

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Test 64K read speed with system cache

dd if=/dev/zero of=/…/test bs=64k count=100000

Test 64K read speed without system cache

dd if=/dev/zero of=/…/test bs=64k count=100000 oflag=direct

Test 64K write speed with system cache

dd if=/dev/zero of=/…/test bs=64k count=10000

Test 64K write speed without system cache

dd if=/dev/zero of=/…/test bs=8k count=10000 oflag=direct

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