On Wed, Aug 14, 2019 at 2:38 PM Olivier AUDRY <olivier(a)nmlq.fr> wrote:
let's test random write
rbd -p kube bench kube/bench --io-type write --io-size 8192 --io-threads 256 --io-total
10G --io-pattern rand
elapsed: 125 ops: 1310720 ops/sec: 10416.31 bytes/sec: 85330446.58
dd if=/dev/zero of=test bs=8192k count=100 oflag=direct
838860800 bytes (839 MB, 800 MiB) copied, 24.6185 s, 34.1 MB/s
34.1MB/s vs 85MB/s ....
34 apples vs. 85 oranges
You are comparing 256 threads with a huge queue depth vs a single
thread with a normal queue depth.
Use fio on the mounted rbd to get better control over what it's doing
Paul
> _______________________________________________
> ceph-users mailing list -- ceph-users(a)ceph.io
> To unsubscribe send an email to ceph-users-leave(a)ceph.io