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SGI Altix

Machine Description

Model Number SGI Altix 4700
Processor Type Intel Itanium Dual Core @ 1.6GHz
Number of Processors 128
Number of Cores 256
Memory Installed 512 Gbytes
Memory Used by FMS 256 Gbytes
Operating System Linux 2.6.16.27-0.9-default

Problem Description

Code Used Example 11
Matrix Sparsity Full
Matrix Symmetry Symmetric and Nonsymmetric
Data Type 16-byte Complex
Number of Equations 20,000 to 500,000
Number of Vectors 1
Reduced Operation Algorithms None (IALGOR=0)

Results for Complex Symmetric Matrices

Date
Started		 Number of
Equations		 Storage Times (Day::Hr:Min:Sec) Megaflops Parallel
Speedup
Loc. Gbytes CPU Wall I/O Wait CPU Overall
04/17/07 20,000 Mem. 5.6 1:42:22 1:15 0:11 1,736 141,976 81.7
04/17/07 20,000 Disk 5.6 1:40:38 1:23 0:09 1,766 129,130 73.1
04/17/07 40,000 Mem. 22.3 11:05:53 6:02 0:17 2,135 235,869 110.4
04/17/07 40,000 Disk 22.3 12:23:26 6:54 0:31 1,913 205,993 107.7
04/17/07 60,000 Mem. 33.8 1::08:57:09 16:57 2:28 2,427 283,279 116.7
04/17/07 60,000 Disk 33.8 1::11:30:12 17:12 0:07 2,253 279,079 123.8
04/17/07 80,000 Disk 58.1 2::12:27:27 27:53 0:13 3,136 408,154 130.1
04/17/07 100,000 Disk 91.5 4::02:35:08 43:05 0:21 3,756 515,877 137.3
04/17/07 150,000 Disk 204.0 11::06:19:00 1:48:38 0:50 4,624 690,412 149.3
04/17/07 200,000 Disk 361.1 25::02:24:04 3:45:49 1:31 4,918 787,282 160.1

Results for Complex Nonsymmetric Matrices

Date
Started		 Number of
Equations		 Storage Times (Day::Hr:Min:Sec) Megaflops Parallel
Speedup
Loc. Gbytes CPU Wall I/O Wait CPU Overall
04/17/07 20,000 Mem. 11.1 3:10:19 1:27 0:00 1,868 246,140 131.7
04/17/07 40,000 Mem. 44.6 19:17:09 7:46 0:00 2,458 365,941 148.9
04/25/07 40,000 Disk 44.6 20:07:08 8:36 0:34 2,356 330,725 140.3
04/17/07 60,000 Mem. 67.5 2::07:53:43 19:05 0:00 2,862 503,198 175.8
04/25/07 100,000 Disk 182.9 7::20:50:05 1:01:05 2:11 3,922 727,584 185.5
04/25/07 250,000 Disk 1103.2 93::18:00:27 11:06:23 42:33 5,144 1,042,123 202.6
05/26/07 500,000 Disk 4047.6 693::01:26:18 2::22:29:19 39:18 5,566 1,313,587 236.0

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 overall increase in performance due to parallel processing.


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