Nexus/MC2: Difference between revisions

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The [[Nexus]] scheduler houses [https://cyber.umd.edu/about MC2]'s new computational partition. Only MC2 lab members are able to run non-interruptible jobs on these nodes.
The previous standalone cluster for [https://cyber.umd.edu/about MC2]'s compute nodes have folded into [[Nexus]] as of mid 2022.
 
The Nexus cluster already has a large pool of compute resources made possible through college-level funding for UMIACS and CSD faculty. Details on common nodes already in the cluster (Tron partition) can be found [[Nexus/Tron | here]].
 
Please [[HelpDesk | contact staff]] with any questions or concerns.


= Submission Nodes =
= Submission Nodes =
There are two submission nodes for Nexus exclusively available for MC2 users.
You can [[SSH]] to <code>nexusmc2.umiacs.umd.edu</code> to log in to a submission node.


If you store something in a local filesystem directory (/tmp, /scratch0) on one of the two submission nodes, you will need to connect to that same submission node to access it later. The actual submission nodes are:
* <code>nexusmc200.umiacs.umd.edu</code>
* <code>nexusmc200.umiacs.umd.edu</code>
* <code>nexusmc201.umiacs.umd.edu</code>
* <code>nexusmc201.umiacs.umd.edu</code>


= Resources =  
= Resources =  
The MC2 partition has nodes brought over from the previous standalone MC2 Slurm scheduler. The compute nodes are named <code>twist##</code>.
The MC2 partition has nodes brought over from the previous standalone MC2 Slurm scheduler, which have since been combined with older nodes purchased by other labs/centers. The compute nodes are named <code>legacy##</code>.


= QoS =  
= QoS =  
MC2 users have access to all of the [[Nexus#Quality_of_Service_.28QoS.29 | standard job QoSes]] in the <code>mc2</code> partition using the <code>mc2</code> account.
MC2 users have access to all of the [[Nexus#Quality_of_Service_.28QoS.29 | standard job QoSes]] in the MC2 partition using the <code>mc2</code> account.


The additional QoSes for the MC2 partition specifically are:
The additional jobs QoSes for the MC2 partition specifically are:
* <code>highmem</code>: Allows for significantly increased memory to be allocated.
* <code>huge-long</code>: Allows for longer jobs using higher overall resources.
* <code>huge-long</code>: Allows for longer jobs using higher overall resources.


Please note that the partition has a <code>GrpTRES</code> limit of 100% of the available cores/RAM on the partition-specific nodes plus 50% of the available cores/RAM on legacy## nodes, so your job may need to wait if all available cores/RAM (or GPUs) are in use.
Please note that the partition has a <code>GrpTRES</code> limit of 100% of the available cores/RAM on the partition-specific nodes in aggregate plus 50% of the available cores/RAM on legacy## nodes in aggregate, so your job may need to wait if all available cores/RAM (or GPUs) are in use.


= Jobs =
= Jobs =
You will need to specify <code>--partition=mc2</code>, <code>--account=mc2</code>, and a specific <code>--qos</code> to be able to submit jobs to the MC2 partition.  
You will need to specify <code>--partition=mc2</code> and <code>--account=mc2</code> to be able to submit jobs to the MC2 partition.  


<pre>
<pre>
[username@nexusmc200:~ ] $ srun --pty --ntasks=4 --mem=8G --qos=default --partition=mc2 --account=mc2 --time 1-00:00:00 bash
[username@nexusmc200 ~]$ srun --pty --ntasks=4 --mem=8G --qos=default --partition=mc2 --account=mc2 --time 1-00:00:00 bash
srun: job 218874 queued and waiting for resources
srun: job 218874 queued and waiting for resources
srun: job 218874 has been allocated resources
srun: job 218874 has been allocated resources
[username@twist00:~ ] $ scontrol show job 218874
[username@legacy00 ~]$ scontrol show job 218874
JobId=218874 JobName=bash
JobId=218874 JobName=bash
   UserId=username(1000) GroupId=username(21000) MCS_label=N/A
   UserId=username(1000) GroupId=username(21000) MCS_label=N/A
Line 39: Line 45:
   Partition=mc2 AllocNode:Sid=nexusmc200:25443
   Partition=mc2 AllocNode:Sid=nexusmc200:25443
   ReqNodeList=(null) ExcNodeList=(null)
   ReqNodeList=(null) ExcNodeList=(null)
   NodeList=twist00
   NodeList=legacy00
   BatchHost=twist00
   BatchHost=legacy00
   NumNodes=1 NumCPUs=4 NumTasks=4 CPUs/Task=1 ReqB:S:C:T=0:0:*:*
   NumNodes=1 NumCPUs=4 NumTasks=4 CPUs/Task=1 ReqB:S:C:T=0:0:*:*
   TRES=cpu=4,mem=8G,node=1,billing=2266
   TRES=cpu=4,mem=8G,node=1,billing=2266

Latest revision as of 13:58, 26 November 2024

The previous standalone cluster for MC2's compute nodes have folded into Nexus as of mid 2022.

The Nexus cluster already has a large pool of compute resources made possible through college-level funding for UMIACS and CSD faculty. Details on common nodes already in the cluster (Tron partition) can be found here.

Please contact staff with any questions or concerns.

Submission Nodes

You can SSH to nexusmc2.umiacs.umd.edu to log in to a submission node.

If you store something in a local filesystem directory (/tmp, /scratch0) on one of the two submission nodes, you will need to connect to that same submission node to access it later. The actual submission nodes are:

  • nexusmc200.umiacs.umd.edu
  • nexusmc201.umiacs.umd.edu

Resources

The MC2 partition has nodes brought over from the previous standalone MC2 Slurm scheduler, which have since been combined with older nodes purchased by other labs/centers. The compute nodes are named legacy##.

QoS

MC2 users have access to all of the standard job QoSes in the MC2 partition using the mc2 account.

The additional jobs QoSes for the MC2 partition specifically are:

  • highmem: Allows for significantly increased memory to be allocated.
  • huge-long: Allows for longer jobs using higher overall resources.

Please note that the partition has a GrpTRES limit of 100% of the available cores/RAM on the partition-specific nodes in aggregate plus 50% of the available cores/RAM on legacy## nodes in aggregate, so your job may need to wait if all available cores/RAM (or GPUs) are in use.

Jobs

You will need to specify --partition=mc2 and --account=mc2 to be able to submit jobs to the MC2 partition. 

[username@nexusmc200 ~]$ srun --pty --ntasks=4 --mem=8G --qos=default --partition=mc2 --account=mc2 --time 1-00:00:00 bash
srun: job 218874 queued and waiting for resources
srun: job 218874 has been allocated resources
[username@legacy00 ~]$ scontrol show job 218874
JobId=218874 JobName=bash
   UserId=username(1000) GroupId=username(21000) MCS_label=N/A
   Priority=897 Nice=0 Account=mc2 QOS=default
   JobState=RUNNING Reason=None Dependency=(null)
   Requeue=1 Restarts=0 BatchFlag=0 Reboot=0 ExitCode=0:0
   RunTime=00:00:06 TimeLimit=1-00:00:00 TimeMin=N/A
   SubmitTime=2022-11-18T11:13:56 EligibleTime=2022-11-18T11:13:56
   AccrueTime=2022-11-18T11:13:56
   StartTime=2022-11-18T11:13:56 EndTime=2022-11-19T11:13:56 Deadline=N/A
   PreemptEligibleTime=2022-11-18T11:13:56 PreemptTime=None
   SuspendTime=None SecsPreSuspend=0 LastSchedEval=2022-11-18T11:13:56 Scheduler=Main
   Partition=mc2 AllocNode:Sid=nexusmc200:25443
   ReqNodeList=(null) ExcNodeList=(null)
   NodeList=legacy00
   BatchHost=legacy00
   NumNodes=1 NumCPUs=4 NumTasks=4 CPUs/Task=1 ReqB:S:C:T=0:0:*:*
   TRES=cpu=4,mem=8G,node=1,billing=2266
   Socks/Node=* NtasksPerN:B:S:C=0:0:*:* CoreSpec=*
   MinCPUsNode=1 MinMemoryNode=8G MinTmpDiskNode=0
   Features=(null) DelayBoot=00:00:00
   OverSubscribe=OK Contiguous=0 Licenses=(null) Network=(null)
   Command=bash
   WorkDir=/nfshomes/username
   Power=

Storage

All data filesystems that were available in the standalone MC2 cluster are also available in Nexus.

MC2 users can also request Nexus project allocations.

Retrieved from "https://wiki.umiacs.umd.edu/umiacs/index.php?title=Nexus/MC2&oldid=12230"