Are you using opensource Ceph packages or suse ones? On Sat, Feb 4, 2017 at 3:54 PM, Ahmed Khuraidah <abushi...@gmail.com> wrote:
> I Have opened ticket on http://tracker.ceph.com/ > > http://tracker.ceph.com/issues/18816 > > > My client and server kernels are the same, here is info: > # lsb_release -a > LSB Version: n/a > Distributor ID: SUSE > Description: SUSE Linux Enterprise Server 12 SP2 > Release: 12.2 > Codename: n/a > # uname -a > Linux cephnode 4.4.38-93-default #1 SMP Wed Dec 14 12:59:43 UTC 2016 > (2d3e9d4) x86_64 x86_64 x86_64 GNU/Linux > > > Thanks > > On Fri, Feb 3, 2017 at 1:59 PM, John Spray <jsp...@redhat.com> wrote: > >> On Fri, Feb 3, 2017 at 8:07 AM, Ahmed Khuraidah <abushi...@gmail.com> >> wrote: >> > Thank you guys, >> > >> > I tried to add option "exec_prerun=echo 3 > /proc/sys/vm/drop_caches" as >> > well as "exec_prerun=echo 3 | sudo tee /proc/sys/vm/drop_caches", but >> > despite FIO corresponds that command was executed, there are no changes. >> > >> > But, I caught very strange another behavior. If I will run my FIO test >> > (speaking about 3G file case) twice, after the first run FIO will >> create my >> > file and print a lot of IOps as described already, but if- before second >> > run- drop cache (by root echo 3 > /proc/sys/vm/drop_caches) I broke >> will end >> > with broken MDS: >> > >> > --- begin dump of recent events --- >> > 0> 2017-02-03 02:34:41.974639 7f7e8ec5e700 -1 *** Caught signal >> > (Aborted) ** >> > in thread 7f7e8ec5e700 thread_name:ms_dispatch >> > >> > ceph version 10.2.4-211-g12b091b (12b091b4a40947aa43919e71a318e >> d0dcedc8734) >> > 1: (()+0x5142a2) [0x557c51e092a2] >> > 2: (()+0x10b00) [0x7f7e95df2b00] >> > 3: (gsignal()+0x37) [0x7f7e93ccb8d7] >> > 4: (abort()+0x13a) [0x7f7e93ccccaa] >> > 5: (ceph::__ceph_assert_fail(char const*, char const*, int, char >> > const*)+0x265) [0x557c51f133d5] >> > 6: (MutationImpl::~MutationImpl()+0x28e) [0x557c51bb9e1e] >> > 7: (std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_relea >> se()+0x39) >> > [0x557c51b2ccf9] >> > 8: (Locker::check_inode_max_size(CInode*, bool, bool, unsigned long, >> bool, >> > unsigned long, utime_t)+0x9a7) [0x557c51ca2757] >> > 9: (Locker::remove_client_cap(CInode*, client_t)+0xb1) >> [0x557c51ca38f1] >> > 10: (Locker::_do_cap_release(client_t, inodeno_t, unsigned long, >> unsigned >> > int, unsigned int)+0x90d) [0x557c51ca424d] >> > 11: (Locker::handle_client_cap_release(MClientCapRelease*)+0x1cc) >> > [0x557c51ca449c] >> > 12: (MDSRank::handle_deferrable_message(Message*)+0xc1c) >> [0x557c51b33d3c] >> > 13: (MDSRank::_dispatch(Message*, bool)+0x1e1) [0x557c51b3c991] >> > 14: (MDSRankDispatcher::ms_dispatch(Message*)+0x15) [0x557c51b3dae5] >> > 15: (MDSDaemon::ms_dispatch(Message*)+0xc3) [0x557c51b25703] >> > 16: (DispatchQueue::entry()+0x78b) [0x557c5200d06b] >> > 17: (DispatchQueue::DispatchThread::entry()+0xd) [0x557c51ee5dcd] >> > 18: (()+0x8734) [0x7f7e95dea734] >> > 19: (clone()+0x6d) [0x7f7e93d80d3d] >> > NOTE: a copy of the executable, or `objdump -rdS <executable>` is >> needed to >> > interpret this. >> >> Oops! Please could you open a ticket on tracker.ceph.com, with this >> backtrace, the client versions, any non-default config settings, and >> the series of operations that led up to it. >> >> Thanks, >> John >> >> > " >> > >> > On Thu, Feb 2, 2017 at 9:30 PM, Shinobu Kinjo <ski...@redhat.com> >> wrote: >> >> >> >> You may want to add this in your FIO recipe. >> >> >> >> * exec_prerun=echo 3 > /proc/sys/vm/drop_caches >> >> >> >> Regards, >> >> >> >> On Fri, Feb 3, 2017 at 12:36 AM, Wido den Hollander <w...@42on.com> >> wrote: >> >> > >> >> >> Op 2 februari 2017 om 15:35 schreef Ahmed Khuraidah >> >> >> <abushi...@gmail.com>: >> >> >> >> >> >> >> >> >> Hi all, >> >> >> >> >> >> I am still confused about my CephFS sandbox. >> >> >> >> >> >> When I am performing simple FIO test into single file with size of >> 3G I >> >> >> have too many IOps: >> >> >> >> >> >> cephnode:~ # fio payloadrandread64k3G >> >> >> test: (g=0): rw=randread, bs=64K-64K/64K-64K/64K-64K, >> ioengine=libaio, >> >> >> iodepth=2 >> >> >> fio-2.13 >> >> >> Starting 1 process >> >> >> test: Laying out IO file(s) (1 file(s) / 3072MB) >> >> >> Jobs: 1 (f=1): [r(1)] [100.0% done] [277.8MB/0KB/0KB /s] [4444/0/0 >> >> >> iops] >> >> >> [eta 00m:00s] >> >> >> test: (groupid=0, jobs=1): err= 0: pid=3714: Thu Feb 2 07:07:01 >> 2017 >> >> >> read : io=3072.0MB, bw=181101KB/s, iops=2829, runt= 17370msec >> >> >> slat (usec): min=4, max=386, avg=12.49, stdev= 6.90 >> >> >> clat (usec): min=202, max=5673.5K, avg=690.81, stdev=361 >> >> >> >> >> >> >> >> >> But if I will change size to file to 320G, looks like I skip the >> cache: >> >> >> >> >> >> cephnode:~ # fio payloadrandread64k320G >> >> >> test: (g=0): rw=randread, bs=64K-64K/64K-64K/64K-64K, >> ioengine=libaio, >> >> >> iodepth=2 >> >> >> fio-2.13 >> >> >> Starting 1 process >> >> >> Jobs: 1 (f=1): [r(1)] [100.0% done] [4740KB/0KB/0KB /s] [74/0/0 >> iops] >> >> >> [eta >> >> >> 00m:00s] >> >> >> test: (groupid=0, jobs=1): err= 0: pid=3624: Thu Feb 2 06:51:09 >> 2017 >> >> >> read : io=3410.9MB, bw=11641KB/s, iops=181, runt=300033msec >> >> >> slat (usec): min=4, max=442, avg=14.43, stdev=10.07 >> >> >> clat (usec): min=98, max=286265, avg=10976.32, stdev=14904.82 >> >> >> >> >> >> >> >> >> For random write test such behavior not exists, there are almost the >> >> >> same >> >> >> results - around 100 IOps. >> >> >> >> >> >> So my question: could please somebody clarify where this caching >> likely >> >> >> happens and how to manage it? >> >> >> >> >> > >> >> > The page cache of your kernel. The kernel will cache the file in >> memory >> >> > and perform read operations from there. >> >> > >> >> > Best way is to reboot your client between test runs. Although you can >> >> > drop kernel caches I always reboot to make sure nothing is cached >> locally. >> >> > >> >> > Wido >> >> > >> >> >> P.S. >> >> >> This is latest SLES/Jewel based onenode setup which has: >> >> >> 1 MON, 1 MDS (both data and metadata pools on SATA drive) and 1 OSD >> >> >> (XFS on >> >> >> SATA and journal on SSD). >> >> >> My FIO config file: >> >> >> direct=1 >> >> >> buffered=0 >> >> >> ioengine=libaio >> >> >> iodepth=2 >> >> >> runtime=300 >> >> >> >> >> >> Thanks >> >> >> _______________________________________________ >> >> >> ceph-users mailing list >> >> >> ceph-users@lists.ceph.com >> >> >> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> > _______________________________________________ >> >> > ceph-users mailing list >> >> > ceph-users@lists.ceph.com >> >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > >> > >> > >> > _______________________________________________ >> > ceph-users mailing list >> > ceph-users@lists.ceph.com >> > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> > >> > >
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