[PVFS2-users] Low performance of PVFS2 on our small cluster

[Silvestre Zabala]

On Wed, Nov 03, 2004 at 01:05:28PM +0100, Silvestre Zabala wrote:

> Using -i 5 in conjuction with -b got me only
> 
> $ mpiexec -n 10 -env PVFS2TAB_FILE /home/zabala/src/pvfs2tab ./mpi-io-test -f pvfs2:/p/mpi-io-test -b 134217728 -i 5
> # Using mpi-io calls.
> io_datafile_complete_operations failed: Operation cancelled (possibly due to timeout)
> *** error path with 0 msgpairs pending, 1 flows pending, 0 write acks pending
> pvfs_sys_read returns with -1610612737
> node 3, read error, loc = 402653184: Operation now in progress
[...]

Just for completeness sake: With "TroveSync Yes" it terminates
successfully:

$ mpiexec -n 10 -env PVFS2TAB_FILE /home/zabala/src/pvfs2tab ./mpi-io-test -f pvfs2:/p/mpi-io-test -b 134217728 -i 5
# Using mpi-io calls.
nr_procs = 10, nr_iter = 5, blk_sz = 134217728
# total_size = 6710886400
# Write: min_t = 202.407412, max_t = 212.409920, mean_t = 207.102769,
# var_t = 8.667097
# Read:  min_t = 190.874922, max_t = 222.914317, mean_t = 207.976142,
# var_t = 168.738639
Write bandwidth = 31.594035 Mbytes/sec
Read bandwidth = 30.105228 Mbytes/sec

Best regards,
  Silvestre

-- 
http://silvestre.zabala.name/