PALMA-NG

Overview

palma3 is the login node to a newer part of the PALMA system. It has various queues/partitions for different purposes:

  • u0dawin: A queue for general purpose. It is usable for everyone, even without being a member of the groups that have submittet a proposal for PALMA. It replaces the old ZIVHPC cluster
  • k20gpu: Four nodes equipped with 3 K20 nVidia Tesla accelerators each
  • normal: 29 nodes with 32 Broadwell CPU cores each and 128 GB RAM.
  • zivsmp: An AMD Opteron machine with 64 cores and 512 GB RAM (The former ZIVSMP)
  • phi: Two nodes with 4 Intel Xeon Phi Knights Corner accelerators each. (not available yet).
  • knl: Four nodes with a Xeon Phi Knights Landing accelerator
  • requeue: Job in this queue will run on the nodes of the above mentioned 18 nodes. If your jobs are running on one of the exclusive nodes while jobs are put in there, your job will be terminated and requeued, so use with care.

There are some special queues, which are only allowed for certain groups (these are also Broadwell nodes like in the normal queue):

  • p0fuchs: 8 nodes for exclusive usage
  • p0kulesz: 4 nodes for exclusive usage
  • p0klasen: 1 nodes for exclusive usage
  • p0kapp: 1 nodes for exclusive usage
  • hims: 4 nodes for exclusive usage

The module concept

Environment variables (like PATH, LD_LIBRARY_PATH) for compilers and libraries can be set by modules:

Command (Short- and Long-form) Meaning
module av[ailable] Lists all available modules
module li[st] Lists all modules in the actual enviroment
module show modulname Lists all changes caused by a module
module add modul1 modul2 ... Adds module to the current environment
module rm modul1 modul2 ... Deletes module from the current environment
module purge Deletes all modules from czrrent environment
Several environment variables will be set by the modules.

When you log in to palma3, some modules are loaded automatically.

Using the module command in submit scripts

This is only valid for the u0dawin queue

If you want to use the module command in submit scripts, the line

source /etc/profile.d/modules.sh; source /etc/profile.d/modules_local.sh

has to be added before. Otherwise, just put the "module add" commands in your .bashrc (which can be found in your home-directory).

Monitoring

Ganglia

If you have X forwarding enabled, you can use llview (Just type "llview" at the command line).

llview.png

The batch system

The batch system on PALMA3 is SLURM, but there is a wrapper for PBS installed, so most of your skripts should still be able to work. If you want to switch to SLURM, this document might help you: https://slurm.schedmd.com/rosetta.pdf

When using PBS skript, there are some differences to PALMA:

  • The first line of the submit script has to be #!/bin/bash
  • A queue is called partition in terms of SLURM. These terms will be used synonymous here.
  • The variable $PBS_O_WORKDIR will not be set. Instead you will start in the directory in which the script resides.
  • For using the "module add" command, you will have to source some scripts first: "source /etc/profile.d/modules.sh; source /etc/profile.d/modules_local.sh"

Submit a job

Create a file for example called submit.cmd

#!/bin/bash

# set the number of nodes
#SBATCH --nodes=1

# set the number of CPU cores per node
#SBATCH -n 8

# set a partition
#SBATCH -p u0dawin

# set max wallclock time
#SBATCH --time=24:00:00

# set name of job
#SBATCH --job-name=test123

# mail alert at start, end and abortion of execution
#SBATCH --mail-type=ALL

# set an output file
#SBATCH -o output.dat

# send mail to this address
#SBATCH --mail-user=your_account@uni-muenster.de

# In the u0dawin queue, you will need the following line
source /etc/profile.d/modules.sh; source /etc/profile.d/modules_local.sh

# run the application
./program

You can send your submission to the batch system with the command "sbatch submit.cmd"

A detailed description can be found here: http://slurm.schedmd.com/sbatch.html

Show information about the queues

scontrol show partition

Show information about the nodes

sinfo

Running interactive jobs with SLURM

Use for example the following command:

srun -p u0dawin -N 1 --ntasks-per-node=8 --pty bash

This starts a job in the u0dawin queue/partition on one node with eight cores.

Information on jobs

List all current jobs for a user:

squeue -u <username>

List all running jobs for a user:

squeue -u <username> -t RUNNING

List all pending jobs for a user:

squeue -u <username> -t PENDING

List all current jobs in the normal partition for a user:

squeue -u <username> -p normal

List detailed information for a job (useful for troubleshooting):

scontrol show jobid -dd <jobid>

Once your job has completed, you can get additional information that was not available during the run. This includes run time, memory used, etc.

To get statistics on completed jobs by jobID:

sacct -j <jobid> --format=JobID,JobName,MaxRSS,Elapsed

To view the same information for all jobs of a user:

sacct -u <username> --format=JobID,JobName,MaxRSS,Elapsed

Show priorities for waiting jobs:

sprio

Controlling jobs

To cancel one job:

scancel <jobid>

To cancel all the jobs for a user:

scancel -u <username>

To cancel all the pending jobs for a user:

scancel -t PENDING -u <username>

To cancel one or more jobs by name:

scancel --name myJobName

To pause a particular job:

scontrol hold <jobid>

To resume a particular job:

scontrol resume <jobid>

To requeue (cancel and rerun) a particular job:

scontrol requeue <jobid>

-- Holger Angenent - 2016-08-22

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