[Pvfs2-users] Expected/ToExpect vs. real performance ??

[belcampo]

Hi all,

New to pvfs and related stuff, so try to be kind with me ;-)
I installed according the pvfs2-quickstart guide.
pvfs2-ping -m /mnt/pvfs2

(1) Parsing tab file...

(2) Initializing system interface...

(3) Initializing each file system found in tab file: /etc/fstab...

    PVFS2 servers: tcp://server:3334
    Storage name: pvfs2-fs
    Local mount point: /mnt/pvfs2
    /mnt/pvfs2: Ok

(4) Searching for /mnt/pvfs2 in pvfstab...

    PVFS2 servers: tcp://server:3334
    Storage name: pvfs2-fs
    Local mount point: /mnt/pvfs2

    meta servers:
    tcp://mmulti:3334

    data servers:
    tcp://mmulti:3334
    tcp://mm1:3334
    tcp://server:3334

(5) Verifying that all servers are responding...

    meta servers:
    tcp://mmulti:3334 Ok

    data servers:
    tcp://mmulti:3334 Ok
    tcp://mm1:3334 Ok
    tcp://server:3334 Ok

(6) Verifying that fsid 533592664 is acceptable to all servers...

    Ok; all servers understand fs_id 533592664

(7) Verifying that root handle is owned by one server...

    Root handle: 1048576
      Ok; root handle is owned by exactly one server.

=============================================================

The PVFS2 filesystem at /mnt/pvfs2 appears to be correctly configured.

Copying files to /mnt/pvfs limited by network, so OK.

Did a high IO-demanding muxing of audio/video first locally and then on 
/mnt/pvfs2 both from the same machine which is one of the data servers.

Local

Saving to timetest.mp4: 0.500 secs Interleaving
7.58user 19.71system 1:52.26elapsed 24%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (77major+6054minor)pagefaults 0swaps

on /mnt/pvfs2

Saving to timetest.mp4: 0.500 secs Interleaving
37.56user 61.05system 41:54.96elapsed 3%CPU (0avgtext+0avgdata 
0maxresident)k
0inputs+0outputs (68major+6063minor)pagefaults 0swaps

System load user about times 5, system > times 20, needed time > times 20.

What could be the reason it is, like it is.

Regards

Henk Schoneveld