Mönch, named after a mountain in the Bernese Alps, elevation 4107m, is the PASC cluster.

This machine is a 10 rack NEC-provided Intel-based system with 4 login nodes, 376 standard compute nodes, 40 large-memory compute nodes (64GB RAM), 24 huge-memory compute nodes (256GB  RAM) and 8 servers to provide I/O to Lustre.

Each of the standard compute nodes consists of 2 Intel 10-core Ivy Bridge EP E5-2660v2 processors, offering 20 cores per node. The nominal frequency of this CPU is 2.2 GHz, the effective frequency in turbo mode is typically 2.5 GHz. Each compute node has 32GB of 1600MHz DDR3 RAM.

The 4 login nodes have the same processors and amount of memory as the compute nodes.

In total there are 7,520 compute cores and over 18.7 Terabytes of memory available on the compute nodes.


ModelNEC cluster

376 Compute Nodes

2 x Intel® Xeon® EP E5-2660 v2 (Ivy Bridge) @ 2.2 GHz (10 cores/socket)

4 Login Nodes

2 x Intel® Xeon® EP E5-2660 v2 (Ivy Bridge) @ 2.2 GHz (10 cores/socket) 32 GB RAM

Memory Capacity per node

32/64/256 GB (DDR3-1600)

Memory Bandwidth per node

51.2/51.2/204.8 GB/s

Total System Memory

18.2 TB DDR3

Interconnect Configuration

1 Infiniband FDR high-speed interconnects. Full non-blocking fat tree topology

Scratch capacity

/mnt/lnec 350 TB



The system has 2 high-speed interconnects based on FDR: the first one is dedicated to the MPI traffic and the second one to the storage high speed traffic (GPFS, file transfer, etc.).