From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stefan Priebe - Profihost AG Subject: Re: Why is librbd1 / librados2 from Firefly 20% slower than the one from dumpling? Date: Wed, 02 Jul 2014 15:01:06 +0200 Message-ID: <53B40292.2000108@profihost.ag> References: <539B11C4.1010400@profihost.ag> <53AD1411.101@profihost.ag> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: ceph-users-bounces-idqoXFIVOFJgJs9I8MT0rw@public.gmane.org Sender: "ceph-users" To: Gregory Farnum Cc: "ceph-devel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , ceph-users List-Id: ceph-devel.vger.kernel.org Am 02.07.2014 00:51, schrieb Gregory Farnum: > On Thu, Jun 26, 2014 at 11:49 PM, Stefan Priebe - Profihost AG > wrote: >> Hi Greg, >> >> Am 26.06.2014 02:17, schrieb Gregory Farnum: >>> Sorry we let this drop; we've all been busy traveling and things. >>> >>> There have been a lot of changes to librados between Dumpling and >>> Firefly, but we have no idea what would have made it slower. Can you >>> provide more details about how you were running these tests? >> >> it's just a normal fio run: >> fio --ioengine=rbd --bs=4k --name=foo --invalidate=0 >> --readwrite=randwrite --iodepth=32 --rbdname=fio_test2 --pool=teststor >> --runtime=90 --numjobs=32 --direct=1 --group >> >> Running one time with firefly libs and one time with dumpling libs. >> Traget is always the same pool on a firefly ceph storage. > > What's the backing cluster you're running against? What kind of CPU > usage do you see with both? 25k IOPS is definitely getting up there, > but I'd like some guidance about whether we're looking for a reduction > in parallelism, or an increase in per-op costs, or something else. Hi Greg, i don't have that test cluster anymore. It had to go into production with dumpling. So i can't tell you. Sorry. Stefan > -Greg > Software Engineer #42 @ http://inktank.com | http://ceph.com > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >