Sitsofe, Good to know someone is getting replay to work. Were you replaying on the same host where the blktrace was recorded? I am not. I'll try with no --iodepth command. That is all I see different between your methodology and mine.
I would also like to know what the message - fio: file hash not empty on exit - means. What is btreplay? Does it allow device mapping if the traced devices have different names on the replay host? Will btreplay run unconstrained by the original timings? Thanks, Eric -----Original Message----- From: Sitsofe Wheeler [mailto:[email protected]] Sent: Wednesday, February 26, 2014 9:30 AM To: Lamkin, Eric Cc: David Nellans; [email protected] Subject: Re: fio replay Hi, I've been using blktrace with fio by doing the following on Fedora 20 with a git version of fio (fio-2.1.5-16-g81fa): blktrace -d /dev/sdd blkparse sdd -O -d sdd.dump fio --read_iolog=sdd.dump --ioengine=libaio --name=replay Using iowatcher I can see that fio is hitting the same blocks that the blktrace recorded. It is also worth noting that certain options like rate, rate_iops and bs do not seem to affect replay jobs. Additionally, fio does not seem able to replay a job with the same timings that it is was recorded with (it also seems to do so faster) whereas btreplay has no issue doing this (even reproducing similar depths to the original job). The one minor issue that I see is this: Run status group 0 (all jobs): READ: io=40549MB, aggrb=30919KB/s, minb=30919KB/s, maxb=30919KB/s, mint=1342918msec, maxt=1342918msec WRITE: io=40562MB, aggrb=30929KB/s, minb=30929KB/s, maxb=30929KB/s, mint=1342918msec, maxt=1342918msec fio: file hash not empty on exit Why is the file hash not empty on exit? This happens no matter what I do. On Wed, Feb 26, 2014 at 02:23:27PM +0000, Lamkin, Eric wrote: > > Thanks for responding. > I sent the below out last week but didn't get a reply so thought I'd > try a simpler 'what works' tactic this morning. As seen in the below > I'm using 2.0.10. > > > On Feb 26, 2014, at 7:44 AM, "Lamkin, Eric" <[email protected]> wrote: > > > > Is there a version of fio where replay works with a Linux blktrace? > > > anything within the last few years should play them back just fine, is > it broken in a specific version you're trying? -- Sitsofe | http://sucs.org/~sits/ -- To unsubscribe from this list: send the line "unsubscribe fio" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
