Torque and maui node status

Question

I am new for torque and maui.

I was checking for node state to looking for which nodes are free and which nodes are in use.

For torque one command is pbsnodes. Which gives status and other info related to node.

When I was checking for maui then I found command diagnose -n which also shows status of the node.

I was wondering between these 2 status. Both are giving different status for the same situation.

When I do man pbsnodes I got the possible states for node "free", "offline", "down", "reserve", "job-exclusive", "job-sharing", "busy", "time-shared", or "state-unknown" But this type of different state I cant find for diagnose -n.

How pbsnodes and diagnose -n get the status for node. Is there any database like xCAT use for torque or maui?

Thx in advance for your valuable time.

Answer 1

While Torque and Maui are related, they do maintain separate information about the compute nodes which they manage.

Torque is the cluster's resource manager: it keeps track of the list of compute nodes, what hardware each one has, etc. Torque has its own simple job scheduler built-in, but this is often turned off in favor of another scheduler. Maui then sits "on top" of Torque and schedules jobs on its nodes. It supports much more flexible scheduling than the built-in Torque scheduler, and has to keep track of different information than Torque -- so the status it reports may be different.

I don't know xCAT well, but neither one has what you'd really call a database. Torque has a list of nodes in a text file, server_priv/nodes, and Maui just uses whatever nodes are supplied by Torque.