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PRACE prototype systems

A concise description of the prototype facilities at LRZ and their usage

Overview of available system hardware and environment

SGI ICE

This system consists of 64 nodes, each node containing two 4-core Nehalem Xeon E5540 processor sockets with 8 MB shared cache per socket and a frequency of  2.53 GHz. Each node contains 24 GBytes of main memory.  An additional node based on the previous-generation Harpertown (Xeon E5420) processor serves as a front-end for login and development. The interconnect is Infiniband-based; a NAS based file system is provided for parallel I/O and scratch space. Since the system is used for benchmarking occasionally, we do not guarantee that all services will be fully available at all times.

 

Nehalem EX

This system is a single node containing 4 sockets with 8-way Nehalem Xeon X7560 processors and approx 110 GB memory.

Clearspeed accelerator cards

[To be described]

 

Login and usage

Login to the ICE can be performed via  a Linux Cluster login node; from this node, please issue the command

ssh -X  ice1-login

Login to the Nehalem-EX-based test system is similarly done:

ssh -X  lx64tnex

Normally, you should then obtain a standard LRZ environment; availability of compilers, tools etc. is based on environment modules. The default provides

  • Version 11.1 Intel compilers
  • Version 10.1 MKL
  • sgi MPT as an MPI implementation on the ICE (with LRZ wrappers for building programs: mpif90, mpicc, mpiCC)

Starting MPI programs

To run MPI programs, please submit an SGE Job. Inside the job script, please use the mpiexec command to start up your program. Interactive startup is now prohibited.