On 02/20/2015 04:10 PM, Kudryavtsev, Andrey O wrote: > 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] Can you try and bisect the issue? -- Jens Axboe -- 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
