PBS Queue Structure for U2
| Queue Name | Wallclock Limit | Maximum Number of CPUS | Minimum Number of CPUS | User Limit |
|---|---|---|---|---|
| ccr | 3 days | None | 1 | None |
| debug | 1 hour | 64 | 1 | 1 running job |
The ccr queue is the default queue and does not need to be specified.
* No limit to the number jobs submitted by a user. The priority of jobs is determined by CCR Job Priority.
Note:
- The debug queue must be requested explicitly ("-q debug") - jobs will not be routed automatically into the debug queue.
- A standing reservation is generally in place Monday-Friday during regular business hours (0900-1800) for 32 nodes (64 processors) for the exclusive use of the debug queue.
- To request nodes with 4GB (U2 has 64 such nodes) or 8GB (32) of physical RAM, add the MEM4GB or MEM8GB properties to your node resource requests,
- e.g. "-lnodes=4:MEM8GB:ppn=2" will request 8 processors total on the 8GB nodes (remaining U2 nodes all have 2GB of RAM).
- To request Myrinet nodes for codes compiled with MPICH-MX (ch_mx), add the GM property to your node request,
- e.g. "-lnodes=32:GM:ppn=2" will request 32 Myrinet-connected nodes.
- MX (Myrinet Express) is the upgraded firmware for the Myrinet interface. The original firmware was GM (General Manager).
- Need more info?* You can find more using the xpbs GUI, by selecting a queue and clicking the detail button, which shows all of the settings for that queue.