On Fri, Oct 20, 2017 at 12:49 AM, Xiaoxi Chen <superdebuger@xxxxxxxxx> wrote: > Hi, > > I am seeing a lot of lookup request when doing recursive mkdir. > The workload behavior is like: > mkdir DIR0 > mkdir DIR0/DIR1 > mkdir DIR0/DIR1/DIR2 > .... > mkdir DIR0/DIR1/DIR2......./DIR7 > create DIR0/DIR1/DIR2......./DIR7/FILE1 > > and concurrently run on 50+ clients, the dir name in different > clients may or maynot be the same. > > from the admin socket I was seeing ~50K create requests, but > got 400K lookup requests. The lookup eat up most of the mds capability > so file create is slow. > > Where is the lookup comes from and can we have anyway to > optimize it out ? > I don't see this behavior when running following commands in 4.13 kernel client and luminous version ceph-fuse. which client do you use? mkdir d1 mkdir d1/d2 mkdir d1/d2/d3 mkdir d1/d2/d3/d4/ mkdir d1/d2/d3/d4/d5 touch d1/d2/d3/d4/d5/f > Xiaoxi -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
