[torqueusers] Re: scalability of 2.1.2?

Thomas G. Raisor thunder at et.byu.edu
Tue Aug 8 17:30:45 MDT 2006


I have narrowed this down further - I can have exactly 281 nodes in my 
nodes file. Upon adding number 282 things break down.

If I add #282 to the nodes file, then start pbs_server - nodes are in 
state down forever. If I have 281 nodes in the nodes file, start 
pbs_server, everything is fine. I use qmgr create node, then pbsnodes -l 
immediately starts showing all nodes as marked down again, and they stay 
down until I restart the server (with 281 nodes in nodes file). #282 can 
be any node in my cluster. This appears to be a bug. Has anyone else 
seen this kind of behavior?

Garrick Staples wrote:
> On Tue, Aug 08, 2006 at 12:57:40PM -0600, Thomas G. Raisor alleged:
>> Hi all,
>> I am trying to get torque 2.1.2 running on our cluster, but it seems 
>> once I reach a certain number of compute-nodes, pbs_server gives up and 
>> marks everything down.
>> Our cluster is in 4 pieces, 4 subnets, abc and d. The server runs on a 
>> host on the b network. I add all the hosts in b and things work great. I 
>> add a few compute nodes from the a network - things work great. I add 
>> all the rest of the nodes for a, and everything gets marked down - 
>> including all nodes on the b network, and they never become free again.
>> I have compiled using rpp and disable-rpp - same problem.
>> momctl -d 3 reports no problems when things are working, when I scale up 
>> past my b network, the output on added nodes gives the warning: no 
>> hello/cluster-addrs messages received from server
>> To this point I have only been able to successfully get up to about 200 
>> nodes of my 618 node cluster working. I have had it all working on 
>> previous releases of torque and on RHEL 4U2 - I just upgraded to RHEL 
>> 4U3 (platform rocks) and was updating torque at the same time and so far 
>> have failed to get it working.
>> Suggestions?
> I assure you that TORQUE works well with thousands of nodes.
> Probably just need to tune it a bit.  Increase pbs_mom's
> status_update_time variable (details in pbs_mom manpage), increase
> server's job_stat_rate and node_check_rate (details in
> pbs_server_attributes manpage).
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Tom Raisor
HPC Systems Administrator
Brigham Young University

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