How to properly measure the speed of an SSD?

Question

*nix-like systems

Option A

dd if=/dev/zero of=/tmp/test.img bs=1M count=1024 oflag=dsync

Option B

dd if=/dev/zero of=/tmp/test.img bs=1M count=1024 oflag=direct

Answer 1

fio --randrepeat=1 --ioengine=libaio --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randwrite