Measuring IOPS of random, small reads (4kiB, O_DIRECT, single NVMe). (It's for optimising a database engine doing random lookups, but the benchmark is just ran

Measuring IOPS of random, small reads (4kiB, O_DIRECT, single NVMe). (It's for optimising a database engine doing random lookups, but the benchmark is just random reads, no other logic.) Just now I have tested 1,133 kIOPs with threads and 598 kIOPS with io_uring. The SQE queue depth for io_uring and max threads for thread test are set the same, 512. I'd like to think this is due to a particularly well-optimised thread pool :-)