|Machine type||RISC-based distributed-memory multi-processor|
|Models||AlphaServer 8200 5/300, 8400 5/300|
|Operating system||Digital Unix (DEC's flavour of Unix)|
|Compilers||Fortran 77, HPF, C, C++|
|Vendors information Web page||http://www.digital.com/info/hpc/|
|Clock cycle||3.3 ns||3.3 ns|
|Theor. peak performance|
|Per proc. (64-bit)||600 Mflop/s||600 Mflop/s|
|Maximal (64-bit)||3.6 Gflop/s||7.2 Gflop/s|
|Main memory||<=6 GB||<=14 GB|
|Processor/memory||1.6 GB/s||1.6 GB/s|
|No. of processors||6||12|
The AlphaServers are symmetric multi-processing systems which are based on the Alpha 21164 processor. The 8200 model is a somewhat smaller copy of the 8400 model: in the 8200 a maximum of 6 CPUs can be accomodated while this number is 12 for the 8400 model. Also, there is room for at most 6 GB of memory in the 8200 while the 8400 can house 14 GB. However, the amount of CPUs and memory is not independent. For instance, the 8400 has 9 system slots. One of these is reserved for I/O and one will have to contain at least one CPU module which can contain 1 or 2 CPUs. From the remaining slots 6 can be used either for memory or for a CPU module. So, one has to choose for either higher computational power or for more memory. This can potentially be a problem for large applications that require both.
As with the SGI PowerChallenge (see 3.3.6), AlphaServers can be clustered using a PCI bus Memory channel for interconnection of the systems. The systems need not be of the same model. The bandwidth of this interconnect is 100 MB/s. Eight systems can be coupled in this way. To support this kind of cluster computing, HPF and optimised versions of PVM and MPI are available.
Measured Performances: As yet, only single system results for the
AlphaServer 8400 are available. No cluster results are known. In [#linpackbm#
Next: The NEC SX-4. Up: Shared-memory MIMD systems Previous: The HP/Convex C4 series.
Sat Feb 10 15:12:38 EST 1996