Suggested Computer Resources for Running the WS Eta

1. Necessary Compilers

Note: You do not need compilers if you are using the binary distributions of the WS Eta; however, having them affords you more flexibility in the model configuration.

In order to compile the WS Eta locally, you will need ANSI-C and F90 compilers. On LINUX systems, the gnu-C (gcc) compiler is ANSI-compatible, but you will need to purchase an f90 compiler from a third party source. On HP systems, you will have to buy both compilers separate from the bundled OS.

I have compiled and run the WS Eta on linux workstations using both the ABSOFT and Portland Group (PG) Fortran compilers. The PG compiler package includes a autoparellelization capability that will allow users to easily compile the model for use on multi-CPU systems. The absoft package require the purchase of a separate VAST preprocessor.

Information on the ABSOFT compiler can be found at http://www.absoft.com

You will need the Fortran Pro MP package, which includes VAST. Pricing is ~ $900 as of Nov 2002

Information on the PG compiler can be found at http://www.pgroup.com

You will need the PGHPF Workstation package . Pricing is ~ $500 as of Nov 2002

 

2. Hardware Suggestions

Like most modelers, I am of the opinion that more is better and too much of a good thing is wonderful. The faster the CPU and the more memory the better. However, I understand that most of you do not have the resources available to purchase the latest and greatest as soon as it's available. Consequently, I have put together a minimum configuration system and can be used primarily for local case studies and a "preferred" configuration for those who are interested in real-time operational modeling.

Note on processors: In the past, I have found that the AMD processors are much faster for running the WS Eta compared to the INTEL CPUs. This may change in the future as the new families of processors are released.

Another Note: The "minimum" configuration below is really just the slowest dog system on which I would consider running a local area model. The WS Eta will run on weaker systems but you really need to be desperate.

a) Minimum configuration

CPU:	500 MHz (single)
Physical Memory:	256 Mb
Available disk:	9GB IDE
Operating System:	Linux Kernel 2.2.X
External Storage:	CD-RW combo drive

b) Suggested Configuration for real-time modeling

CPU:	2x2000 MHz+ CPUs
Physical Memory:	1-2Gb
Available disk:	72GB or more
Operating System:	Linux Kernel 2.4.X
External Storage:	DVD/CD-RW combo drive

The suggested configuration is subject to change as price/performance ratio decreases. Also, the WS Eta scales very well going from 1->2 CPUs. You will get more performance for your money by opting for a multi-CPU system.

Below is a slide from a recent WS Eta local area modeling talk.