Also nuttcp ( http://www.nuttcp.net ) is a network performance measurement tool:
Server side run:
nuttcp -S
Client run:
nuttcp serverhostname
Example output:
444.9561 MB / 10.00 sec = 373.0956 Mbps 10 %TX 12 %RX 1944 host-retrans
0.55 msRTT
On Apr 29, 2011, at 3:15 PM, Kevin Stone wrote:
> What linux distribution are you running? 32 or 64 bit?
> Do you have the Dell Openmanage tools installed? (can get & set controller
> properties. Dell has RPM repos for this but depends on disto.)
> Is cpu power saving enabled? (/proc/cpuinfo will show lower MHz).
> Have you tested the underlying disk performance? ("iostat -dmx 1" has a
> utilization % - last field)
>
>
> On Apr 29, 2011, at 12:41 PM, Jim Kusznir wrote:
>
>> Hi all:
>>
>> I believe I'm getting very poor performance from my pvfs2 system, and
>> would like to start trying to identify why.
>>
>> System details:
>> 3 pvfs2-io servers, all dedicated to pvfs2:
>> Dell Poweredge 1950 with
>> dual-socket E5310 (quad core 1.6Ghz)
>> 4GB RAM
>> dual onboard gig-E (using balance-alb bonding)
>> PERC 6/e raid for storage
>> PERC 5/i raid1 for metadata/OS storage
>> all servers are metadata servers as well as data servers
>> running pvfs2.8.2 on the servers
>>
>> My cluster has 24 nodes and 1 dedicated compute node, all single-gig
>> connected.
>>
>> Performance to the pvfs2 is extremely slow. Every time I check the
>> load on the pvfs2 nodes, its never greater than 50% and usually well
>> under that. Last time I had to chown a whole bunch of files (a user
>> had 30 directories with over 10k files each), it took nearly 2 full
>> days. I/O from the head node appears to be less than half (possibly
>> less than 1/4) of the rate to local disk. Calculated data rates are
>> well under 1GB. And previous tests showed that once I got I/O from
>> more than 3 or 4 nodes simultaneously, the performance plateaued.
>>
>> I'm not even sure how to proceed with the troubleshooting. The only
>> obvious question that came to mind is whether the bonding-alb is
>> helping or hurting things.
>>
>> --Jim
>> _______________________________________________
>> Pvfs2-users mailing list
>> [email protected]
>> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
>
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