Service Units

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One service unit (SU) is approximately equal to 1 core hour of computing. The charge is calculated based on factors that the slurm workload manager calls 'Trackable RESources' or TRES. The important TRES values for calculating CRC SUs are:

• Number of cores requested
• RAM requested
• On the GPU cluster, number of cards requested.

Each of these has a TRES Billing Weight assigned to it in the cluster configuration files. These weights along with the amount of resources your job is allocated are used to construct a total cost in SUs.  Here is a table listing the weights for each cluster and partition:

To see a more detailed view of this information (including investment hardware configurations), you can use the scontrol slurm command, providing the -M flag to specify a cluster:

[nlc60@login0b ~] : scontrol -M htc show partition
PartitionName=htc
   AllowGroups=ALL AllowAccounts=ALL AllowQos=short,normal,long,htc-htc-s,htc-htc-n,htc-htc-l,htc-htc-s-invest,htc-htc-n-invest,htc-htc-l-invest
   AllocNodes=ALL Default=YES QoS=N/A
   DefaultTime=NONE DisableRootJobs=NO ExclusiveUser=NO GraceTime=0 Hidden=NO
   MaxNodes=1 MaxTime=UNLIMITED MinNodes=0 LLN=NO MaxCPUsPerNode=UNLIMITED
   Nodes=htc-1024-n[0-3],htc-n[24-49]
   PriorityJobFactor=1 PriorityTier=1 RootOnly=NO ReqResv=NO OverSubscribe=NO
   OverTimeLimit=NONE PreemptMode=CANCEL
   State=UP TotalCPUs=1792 TotalNodes=30 SelectTypeParameters=NONE
   JobDefaults=(null)
   DefMemPerNode=UNLIMITED MaxMemPerNode=UNLIMITED
   TRES=cpu=1792,mem=19587200M,node=30,billing=2448
   TRESBillingWeights=CPU=1.0,Mem=0.128G

PartitionName=scavenger
   AllowGroups=ALL AllowAccounts=ALL AllowQos=short,normal,long,htc-scavenger-s,htc-scavenger-n,htc-scavenger-l
   AllocNodes=ALL Default=NO QoS=N/A
   DefaultTime=NONE DisableRootJobs=NO ExclusiveUser=NO GraceTime=0 Hidden=NO
   MaxNodes=1 MaxTime=UNLIMITED MinNodes=0 LLN=NO MaxCPUsPerNode=UNLIMITED
   Nodes=htc-n[24-31]
   PriorityJobFactor=1 PriorityTier=1 RootOnly=NO ReqResv=NO OverSubscribe=NO
   OverTimeLimit=NONE PreemptMode=CANCEL
   State=UP TotalCPUs=384 TotalNodes=8 SelectTypeParameters=NONE
   JobDefaults=(null)
   DefMemPerNode=UNLIMITED MaxMemPerNode=UNLIMITED
   TRES=cpu=384,mem=6180000M,node=8
   TRESBillingWeights=CPU=0.0,Mem=0.0G

For a concise view of the TRES used by a job, you can use the sacct command:

[nlc60@login0b ~] : sacct -X -M smp -j 6169876 --format=User,JobID,Jobname,AllocTRES%30,Elapsed
     User        JobID    JobName                      AllocTRES    Elapsed
--------- ------------ ---------- ------------------------------ ----------
    nlc60 6169876      hello_wor+         cpu=1,mem=4018M,node=1   00:00:01