Sitsofe, > Is this a bad thing? I was aiming for that behaviour (for number_ios to behave per job rather than per loop)... Oh, I didn't catch that. I was assuming that number_ios was analogous to io_size. That is, indicating what each "loop" would do. Wouldn't you be changing the current behavior? My prior test with number_ios and loops was taking about 30 seconds as expected. Thanks Kris Davis Western Digital Coporation Email: kris.davis@xxxxxxx Office:: +1-507-322-2376 -----Original Message----- From: Sitsofe Wheeler [mailto:sitsofe@xxxxxxxxx] Sent: Monday, March 26, 2018 11:01 AM To: Kris Davis <Kris.Davis@xxxxxxx> Cc: fio@xxxxxxxxxxxxxxx; Itay Ben Yaacov <Itay.BenYaacov@xxxxxxx> Subject: Re: "No I/O performed by <engine>" reporting bug? Hi Kris, On 26 March 2018 at 16:49, Kris Davis <Kris.Davis@xxxxxxx> wrote: > > Thanks. I gave it a try and no longer see the error message. However, it doesn't appear that the loop count is being used any longer when number_ios option is set. The following runs is less about a second: > > $ fio --ioengine=libaio --loops=32 --direct=1 --numjobs=1 > --norandommap --randrepeat=0 --size=16GB --filename=/dev/sdb > --name=Random-read-4K-QD1 --rw=randread --bs=4K --iodepth=1 > --number_ios=8192 > Random-read-4K-QD1: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) > 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=1 > fio-3.5 > Starting 1 process > Jobs: 1 (f=1) > Random-read-4K-QD1: (groupid=0, jobs=1): err= 0: pid=31578: Mon Mar 26 10:37:06 2018 > read: IOPS=7433, BW=29.0MiB/s (30.4MB/s)(32.0MiB/1102msec) > slat (nsec): min=4564, max=43459, avg=6011.65, stdev=662.43 ... > Run status group 0 (all jobs): > READ: bw=29.0MiB/s (30.4MB/s), 29.0MiB/s-29.0MiB/s > (30.4MB/s-30.4MB/s), io=32.0MiB (33.6MB), run=1102-1102msec Is this a bad thing? I was aiming for that behaviour (for number_ios to behave per job rather than per loop)... > But, if I use io_size=32MB, it does actually run for about 30 seconds as expected: > > $ fio --ioengine=libaio --loops=32 --direct=1 --numjobs=1 > --norandommap --randrepeat=0 --size=16GB --filename=/dev/sdb > --name=Random-read-4K-QD1 --rw=randread --bs=4K --iodepth=1 > --io_size=32MB > Random-read-4K-QD1: (g=0): rw=randread, bs=(R) 4096B-4096B, (W) > 4096B-4096B, (T) 4096B-4096B, ioengine=libaio, iodepth=1 > fio-3.5 > Starting 1 process > Random-read-4K-QD1: No I/O performed by libaio, perhaps try --debug=io option for details? ^^^ Have you found another problem here? > Random-read-4K-QD1: (groupid=0, jobs=1): err= 0: pid=31998: Mon Mar 26 10:46:45 2018 > read: IOPS=7790, BW=30.4MiB/s (31.9MB/s)(1024MiB/33650msec) > slat (nsec): min=4443, max=43457, avg=4831.99, stdev=286.39 ... > Run status group 0 (all jobs): > READ: bw=30.4MiB/s (31.9MB/s), 30.4MiB/s-30.4MiB/s > (31.9MB/s-31.9MB/s), io=1024MiB (1074MB), run=33650-33650msec > > Disk stats (read/write): > sdb: ios=262130/0, merge=0/0, ticks=31453/0, in_queue=31396, > util=93.06% -- Sitsofe | http://sucs.org/~sits/ ��.n��������+%������w��{.n�������^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�
