Attention
DAIS is operated in user risk mode and will be redeployed from scratch in the 2nd half of September.
This includes the redeploying of the filesystems.
-> All data stored on DAIS will be LOST then.
Dais User Guide
- Name of the cluster:
DAIS
- Institution:
Various MPG Departments
Login nodes:
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Hardware Configuration:
- 2 login node dais[11-12]
- 2 x INTEL(R) XEON(R) PLATINUM 8568Y+ 48-Core Processor @ 2.3 GHz96 cores per nodehyper-threading enabled - 2 threads per core500 GB RAM
- 17 execution nodes daisg[101-117]
- 2 x INTEL(R) XEON(R) PLATINUM 8568Y+ 48-Core Processor @ 2.3 GHz96 cores per nodehyper-threading enabled - 2 threads per core2.0 TB RAM8 x NVIDIA H200 GPUs per node
- node interconnect
based on Mellanox Technologies InfiniBand fabric (Speed: 8*200Gb per GPU Node)
Filesystems:
GPFS-based with total size of 1.0 PB and independent inode space for the following filesets:
- /u
shared home filesystem NO BACKUPS WILL BE DELETED and REDEPLOYED in the 2nd half of September!
Compilers and Libraries:
Hierarchical environment modules are used at MPCDF to provide software packages and enable switching between different software versions. User have to specify the needed modules with explicit versions at login and during the startup of a batch job. Not all software modules are displayed immediately by the module avail command, for some user first needs to load a compiler and/or MPI module. You can search the full hierarchy of the installed software modules with the find-module command.
Batch system based on Slurm
The batch system on DAIS is the Slurm Workload Manager. A brief introduction into the basic commands (srun, sbatch, squeue, scancel, …) can be found on the Raven home page. For more detailed information, see the Slurm handbook. See also the sample batch scripts which must be modified for DAIS cluster.
Current Slurm configuration on DAIS:
default turnaround time: 2 hours
current max. turnaround time (wallclock): 48 hours
p.dais partition include all batch nodes in exclusive usage and is default
s.dais partition can be used for serial jobs and can be shared
Useful tips:
By default run time limit used for jobs that don’t specify a value is 2 hours. Use --time option for sbatch/srun to set a limit on the total run time of the job allocation but not longer than 48 hours
Default memory per node in the shared partition is 250000 MB, maximum per allocated node per job is 2000000 MB. To grant the job access to all of the memory on each node use --mem=0 option for sbatch/srun
The OpenMP codes require a variable OMP_NUM_THREADS to be set. This can be obtained from the Slurm environment variable $SLURM_CPUS_PER_TASK which is set when --cpus-per-task is specified in a sbatch script (an example is on help information page)
To use GPUs add in your slurm scripts --gres option and choose how many GPUs and/or which model of them to have: #SBATCH --gres=gpu:h200:X, where X is a number of resources from 1 up to 8.
GPU cards are in default compute mode.
Support:
For support please create a trouble ticket at the MPCDF helpdesk