ALIs
kommt nochPRACE 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.
This system has been opened for general user access. Since it is used for benchmarking occasionally, we do not guarantee that all services will be fully available at all times.
Nehalem EX based Ultraviolet system
This system is a shared memory system containing 16 blades with 2 sockets per blade. Each socket has 8 physical Nehalem Xeon X7550 cores. The system memory is approx. 512 GByte. This system has been opened for general user access; however it may occasionally be reserved for testing.
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 Ultraviolet system must be done via an interactive SGE job:
qrsh -q uv1_interactive
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.x MKL
- sgi MPT 1.x as an MPI implementation on the ICE (with LRZ wrappers for building programs: mpif90, mpicc, mpiCC)
- sgi MPT 2.x as an MPI implementation on the UltraViolet
Starting MPI programs
To run MPI programs on either the ICE or the UV, please submit an SGE Job. Inside the job script, please use the mpiexec command to start up your program. Interactive startup is now prohibited.