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SGI Origin

Machine Description
Model Number Origin
Number of Processors 128
Processor Type R12000 @ 400 MHz
Operating System IRIX64, Rel. 6.5

Problem and Results

Date Started 05/16/2000 07/09/2000 05/16/2000 07/07/2000
Code Used Example 11 Example 11 Example 11 Example 11
Number of Equations 50,000 50,000 100,000 150,000
Number of Vectors 1 1 1 1
Matrix Sparsity Full Full Full Full
Matrix Symmetry Symmetric Nonsymmetric
With Pivoting		 Symmetric Nonsymmetric
With Pivoting
Data Type 16-byte Complex 16-byte Complex 16-byte Complex 16-byte Complex
Memory for FMS(Gbytes) 16 32 32 48
CPU Time (Day::Hr:Min:Sec) 3::17:37:02 7::12:27:39 24::16:10:51 172::14:12:50
Wall Time (Day::Hr:Min:Sec) 1:04:19 2:16:13 5:49:46 1::12:55:44
I/O Wait Time (Hr:Min:Sec) 2:53 3:53 5:22 36:49
Megaflops per Processor 516 513 625 603
Overall Megaflops 43,190 40,787 63,536 67,698
Parellel Speedup 83.60 out of 128 79.49 out of 128 101.59 out of 128 112.16 out of 128

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 theoretical 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 the overall increase in performance due to parallel processing.


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