Re: [ceph-users] Ceph allocator and performance

2015-08-11 Thread Jan Schermer
Hi, if you look in the archive you'll see I posted something similiar about 2 months ago. You can try something experimenting with 1) stock binaries - tcmalloc 2) LD_PRELOADed jemalloc 3) ceph recompiled with neither (glibc malloc) 4) ceph recompiled with jemalloc (?) We simply recompiled ceph b

[ceph-users] Ceph allocator and performance

2015-08-11 Thread Межов Игорь Александрович
Hi! We got some strange performance results when running random read fio test on our test Hammer cluster. When we run fio-rbd (4k, randread, 8 jobs, QD=32, 500Gb rbd image) at first time (pagecache is cold/empty) we got ~12kiops sustained performance. It is quite resonable value, as 12kiops/3