Thanks for the info. :) -- Srinivasa R Chamarthy On Fri, Aug 5, 2016 at 9:39 AM, Jens Axboe <axboe@xxxxxxxxx> wrote: > On 08/04/2016 04:53 AM, Srinivasa Chamarthy wrote: >> >> Tried the latest git, i do not get the failure now. But i have the >> following questions >> >> 1) The initial failure was due to the fact that there were no files in >> the directory to read. In that case, it may be expected that we write >> the files first and then do read (workload defaults to read if --rw is >> not specified). > > > Right, but that's similar to how a normal read job without > create_on_open would also layout the files to be able to run the read > workload. > > >> 2) For Write or mixed jobs, create_on_open is expected not to layout >> the IO files before the workload. Currently with the latest git, i see >> that it says that files are layed out (but the size is 0) before the >> workload starts. If i do not specify create_on_open, its not laying >> out files at all. And i have to specify create_on_open=0 explicitly to >> layout the files completely. >> >> With create_on_open=1 >> # fio --name=test --directory=/testdata --nrfiles=10 --size=1g >> --refill_buffers=1 --direct=1 --create_on_open=1 --rw=write >> test: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=psync, iodepth=1 >> fio-2.13-38-gff56 >> Starting 1 process >> test: Laying out IO file(s) (10 file(s) / 0MB) >> Jobs: 1 (f=10): [W(1)] [100.0% done] [0KB/5684KB/0KB /s] [0/1421/0 >> iops] [eta 00m:00s] >> >> Without create_on_open (No Initial layout of files) >> # fio --name=test --directory=/testdata --nrfiles=10 --size=1g >> --refill_buffers=1 --direct=1 --rw=write >> test: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=psync, iodepth=1 >> fio-2.13-38-gff56 >> Starting 1 process >> Jobs: 1 (f=10): [W(1)] [8.2% done] [0KB/6612KB/0KB /s] [0/1653/0 iops] >> [eta 02m:37s] >> >> With create_on_open=0 (its laying out files) >> # fio --name=test --directory=/testdata --nrfiles=10 --size=1g >> --refill_buffers=1 --direct=1 --rw=write --create_on_open=0 >> test: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=psync, iodepth=1 >> fio-2.13-38-gff56 >> Starting 1 process >> test: Laying out IO file(s) (10 file(s) / 1023MB) >> Jobs: 1 (f=10): [W(1)] [5.1% done] [0KB/6328KB/0KB /s] [0/1582/0 iops] >> [eta 02m:49s] >> >> Just wanted to get confirmation on what's the default behavior. I was >> under the impression that if create_on_open is not specified, default >> behavior is to layout the files for jobs. > > > Right, that was essentially the behaviour before the recent change. With > the recent change, it'll lay them out if it needs to. It needs to, if > the actual job doesn't do it, or if overwrite=1 is set, for instance, > and it's a writable job. > > -- > 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
