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Cluster greatwhite.sharcnet.ca

Links System documentation in the SHARCNET Help Wiki

Manufacturer Compaq
Operating System Red Hat Linux 7.2
Interconnect Quadrics Elan3
Total processors/cores 468
Nodes
greatwhite: 1
4 cores
Alpha @ 0.5 GHz
Type: Admin
Memory: 4.0 GB
Local storage: 0 Bytes
greatwhite: 2‑3
4 cores
Alpha @ 0.5 GHz
Type: Login
Memory: 4.0 GB
Local storage: 0 Bytes
greatwhite: 4‑71
4 cores
Alpha @ 0.833 GHz
Type: Compute
Memory: 4.0 GB
Local storage: 0 Bytes
greatwhite: 72‑75
4 cores
Alpha @ 1.0 GHz
Type: Compute
Memory: 16.0 GB
Local storage: 0 Bytes
greatwhite: 76‑117
4 cores
Alpha @ 0.677 GHz
Type: Compute
Memory: 4.0 GB
Local storage: 0 Bytes
Total attached storage 0 Bytes
Suitable use

Each of the compute nodes of this sytem consists of 4 then state-of-the-art Alpha processors. The Compaq native C/C++ and Fortran compilers support the promotion of extended precision, e.g. from single to double and from double to quad with compiler switches. For instance, with option -long_double_size 128 when compiling C and C++ code using ccc and cxx respecitvely (undocumented), long double will be defined as 128-bit extended precision. The Fortran compiler fort uses option -r16 or -real_size 128 or double_size 128, to promote default precisions.

The Compaq compilers for Linux do not support OpenMP. One must use POSIX threads API or other alternatives in order to explore the concurrency and parallism using threads on these 4-way SMP compute nodes.

Along with the high performance Quadric interconnect, this Alpha cluster is still an alternative, powerful choice for low latency parallel applications.
Software available