Job Queues

MSI uses job scheduling queues to efficiently and fairly share MSI resources.  The queues available on our systems often manage different sets of hardware, and have different limits for quantities such as walltime, available processors, and available memory.  When submitting a calculation it is important to choose a queue where the job is suited to the hardware and resource limitations.

Below is a summary of the available queues organized by system, and the associated queue limitations.
The quantities listed are totals or upper limits.

Mesabi

Mesabi is an HP Linux cluster with most nodes using Haswell E5-2680v3 processors.

Queue nameNode SharingMax Nodes Per JobMin Nodes Per JobProcessor cores per node
( ppn=)
Wallclock Limit
( walltime=)
Total Node Memory LimitPer-core Memory Limit
( pmem=)
Local Scratch
(GB/node)
Per User LimitsPer Group Limits
smallYes9None2496 hours62gb2580mb390 GBNone1800 total cores
largeNo48102424 hours62gb2580mb390 GB4 Jobs16 Jobs
widestNo360492424 hours62gb2580mb390 GB4 Jobs16 Jobs
maxYes1 (single core per job)None1696 hours62gb62gb390 GB4 Jobs16 Jobs
ram256gYes2None2496 hours252gb10580mb390 GB2 nodes1800 total cores
ram1tYes2None3296 hours998gb31180mb390 GB2 nodes1800 total cores
k40 
GPU nodes*
No40None2424 hours126gb5290mb390 GBNone1800 total cores
mesabi
(default)
The mesabi queue is a meta-queue, which will automatically route jobs to the small, large, widest, or max queues, according to where each job will best fit based on the resource request.

Service Unit (SU) rate: 1.5 CPU hours / SU

*Note:  The k40 queue is for calculations performing GPU computations.  Each of the k40 nodes contains two NVIDIA K40m GPUs.

Note:  The ram1t nodes contain Intel Ivy Bridge processors, which do not support all of the optimized instructions of the Haswell processors.  Programs compiled using the Haswell instructions will only run on the Haswell processors.

Note:  The 1800 core limit is inclusive for all group jobs in the small, ram256g,  ram1t, and k40, queues together.  For example, a group simultaneously using 1798 cores in the small queue and 2 cores in the ram1t queue could run no further simultaneous jobs in the small, ram256g, ram1t, or k40, queues.

Itasca

Itasca is an HP Linux cluster with most nodes using Intel Xeon 5560 Nehalem EP processors, and the "Sandy Bridge" (sb) nodes using Intel Xeon E5-2670 Sandy Bridge processors.

Queue nameNumber of NodesProcessor cores per node
( ppn=)
Wallclock Limit
( walltime=)
Total Node Memory LimitPer-core Memory Limit
( pmem=)
Local Scratch
(GB/node)
Per User Running Jobs
(soft limit / hard limit)
Per User Idle Jobs
(gaining priority in queue)
batch
(default)
1086 nodes (8688 cores)824 hours22gb2750mb90 GB2 / 58
devel32 nodes (256 cores)82 hours22gb2750mb90 GB
long28 nodes (224 cores)848 hours22gb2750mb90 GB
sb35 nodes (560 cores)1648 hours62gb3875mb112 GB
sb1288 nodes (128 cores)1696 hours126gb7875mb534 GB
sb2568 nodes (128 cores)1696 hours254gb15875mb534 GB 

Service Unit (SU) rate: 1.5 CPU hours / SU

On Itasca node sharing is not allowed; Itasca jobs must use whole nodes.  Itasca jobs should always request 8 processors per node (ppn=8) in the batch, devel, and long queues, and 16 processors per node (ppn=16) in the sb, sb128, and sb256 queues.   Special compiling optimization options may give better performance on the Sandy Bridge nodes as described on the ItascaSB webpage.

Lab Servers (isub)

Queue nameNumber of NodesProcessor cores per node
( ppn=)
Wallclock Limit
( walltime=)
Total Node Memory Limit
( mem=)
Per-core Memory Limit
( pmem=)
Local Scratch
(GB/node)
Per User Running JobsPer User Idle Jobs
(gaining priority in queue)
lab
(default)
1 node (8 cores)824 hours15gb1850mb100 GB68
lab-long
( -q lab-long)
1 node (8 cores)8150 hours15gb1850mb100 GB68
lab-600
( -q lab-600)
1 node (8 cores)8600 hours15gb1850mb100 GB18

The Lab Servers are for smaller jobs.  Calculations on the lab servers do not consume Service Units (SUs).  In some cases more nodes are physically present than listed here, but jobs may each request only a single node, so the table represents the queue submission limits for individual jobs.