Hi Jens, I’m running NVMe SSD benchmarks which are using multi-job configurations in the most common scenarios. I have noticed that since 2.2.5 release FIO has 3-4 times higher CPU utilization on the same workload, same system, same kernel 3.18. In fact I’m not able to achieve 450k IOPS on latest Core-i7 CPU due to 100% utilization. I tracked down the changes back, 2.1.14 is the most stable for me. Release had 2.2.0 the reporting issues, which were fixed in 2.2.5 but introduced high CPU utilization instead. Did anyone notice that too? Configuration details are bellow: [global] name=4k random read 4 ios in the queue in 32 queues filename=/dev/nvme0n1 ioengine=libaio direct=1 bs=4k rw=randread iodepth=4 numjobs=32 buffered=0 size=100% runtime=0 randrepeat=0 norandommap refill_buffers [job1] -- Andrey Kudryavtsev, SSD Solution Architect Intel Corp. inet: 83564353 work: +1-916-356-4353 mobile: +1-916-221-2281 -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
