LOTUS cluster specification

LOTUS nodes

LOTUS is a cluster of over 500 nodes/hosts and 13000 CPU cores. A  node/host is an individual computer in the cluster with more than 1 processor. Each node/host belongs to a specific host group. The number of processors (CPUs or cores) per host is listed in Table 1 with the corresponding processor model and the size of the physical memory RAM available per node/host.

To select a node/host with a specific processor model and memory, add the following SLURM directive to your job script    #SBATCH --constraint="<host-group-name>" 

For example  #SBATCH --constraint="skylake348G"

IMPORTANT: ‘intel’ and amd’ node types are defined in the SLURM configuration as a feature:

  • For any Intel node type use  #SBATCH --constraint="intel" while for a specific Intel CPU model then use the host group name (Table 1) e.g. #SBATCH --constraint="haswell256G"
  • For AMD use  #SBATCH --constraint="amd"

Table 1.  LOTUS  cluster specification 

Host group name Number  
of nodes/hosts
Processor model  CPUs  
per host 
haswell256G    12  Intel Xeon E5-2650-v3 "Haswell"  20  256 GB 
broadwell256G    56  Intel Xeon E5-2640-v4 "Broadwell"  20  256 GB 


ivybridge2000G     2  Intel Xeon E7-4860-v2 "Ivy Bridge"  48  2048 GB 
skylake348G  128  Intel Xeon Gold-5118 "Skylake"  24  348 GB 
epyctwo1024G   43  AMD 48  1024 GB 



  • LOTUS nodes of node type epyctwo1024 are not available yet on the par-multi queue
  • If you choose to compile code for specific architectures, then it may not run elsewhere in the system

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