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Benchmarks

Machine Description

Model Number Digital Alpha Server 8400
Number of Processors 14
Processor Type Alpha EV56 at 625 MHz
Operating System Digital UNIX
FMS Memory 2 Gbytes
Number of Controllers 8
Disks per Controller 3

Problem and Results

Code Used Example 11 Example 11 Example 11
Date Started 12/24/97 12/24/97 12/24/97
Number of Equations 10,000 30,000 100,000
Number of Vectors 1,000 3,000 3,600
Matrix Sparsity Full Full Full
Matrix Symmetry Symmetric Symmetric Symmetric
Data Type 16-byte Complex 16-byte Complex 16-byte Complex
CPU Time (Hr:Min:Sec) 1:04:03 31:05:03 876:06:35
Wall Time (Hr:Min:Sec) 5:41 2:25:30 67:40:14
I/O Wait Time (Hr:Min:Sec) In Memory 14:13 2:14:17
Megaflops per Processor 555 515 514
Overall Megaflops 6,262 6,598 6,655
Parellel Speedup 11.3 out of 14 12.8 out of 14 13.0 out of 14

NOTES:

  1. CPU Time is the total amount of User and System time used by all processors.
  2. Wall Time is the elapsed time measured on a dedicated machine. This includes the time spent processing and any time spent waiting for I/O to complete.
  3. I/O Wait Time is the total time spent waiting for I/O to complete that is not overlapped by asynchronous I/O.
  4. Megaflops per Processor is the total number of floating point operations performed, divided by the CPU time.
  5. Overall Megaflops is the total number of floating point operations performed, divided by the Wall Time.
  6. Parallel Speedup is overall increase in performance due to parallel processing.

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