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--- cluster:91 [2010/12/23 10:19]
hmeij
+++ cluster:91 [2011/01/07 15:49] (current)
hmeij
@@ Line 138: / Line 138: @@
 Since the cluster will be shut down December 28th we have an opportunity to run Linpack on the Dell cluster.
-  * N calculation: 36 nodes, 4/8/16 gb mix for a total of 320 gb which yields 40 gb double precision (8 byte) elements … 40 gb is 40*1024*1024*1024 = 42,949,672,960 … take the square root of that and round 207,243 … 80% of that is 167,800
+  * ETHERNET
+  * N calculation: 20 nodes, 4/8/16 gb mix for a total of 192 gb which yields 24 gb double precision (8 byte) elements … 24 gb is 24*1024*1024*1024 = 25,769,803,776 … take the square root of that and round 160529 … 80% of that is 128,423
   * NB: start with 64, then 128, try 192 ...
-  * PxQ: perfect square of 17x17=289, close to the number of cores we have (288) but then swallowtail adds two.
+  * PxQ: perfect square of 10x16=160, the number of cores we have
+<code>
+============================================================================
+T/V                N    NB     P     Q               Time             Gflops
+----------------------------------------------------------------------------
+WR00L2L2       40800   128    10    16             184.42          2.455e+02
+----------------------------------------------------------------------------
+||Ax-b||_oo / ( eps * ||A||_1  * N        ) =        0.0069974 ...... PASSED
+||Ax-b||_oo / ( eps * ||A||_1  * ||x||_1  ) =        0.0105682 ...... PASSED
+||Ax-b||_oo / ( eps * ||A||_oo * ||x||_oo ) =        0.0020883 ...... PASSED
+============================================================================
+</code>
-Since the cluster will be shut down December 28th we have an opportunity to run Linpack on the Dell cluster.
-  * N calculation: 36 nodes, 4/8/16 gb mix for a total of 320 gb which yields 40 gb double precision (8 byte) elements … 40 gb is 40*1024*1024*1024 = 42,949,672,960 … take the square root of that and round 207,243 … 80% of that is 167,800
+  * INFINIBAND
+  * N calculation: 16 nodes, 8 gb per node for a total of 128 gb which yields 16 gb double precision (8 byte) elements … 16 gb is 16*1024*1024*1024 = 17,179,869,184 … take the square root of that and round 131,072 … 80% of that is 104,850
   * NB: start with 64, then 128, try 192 ...
-  * PxQ: perfect square of 17x17=289, close to the number of cores we have (288) but then swallowtail adds two.
+  * PxQ: perfect square of 10x16=160, the number of cores we have
+<code>
+============================================================================
+T/V                N    NB     P     Q               Time             Gflops
+----------------------------------------------------------------------------
+WR00L2L2       52425    64    11    11             294.28          3.264e+02
+----------------------------------------------------------------------------
+||Ax-b||_oo / ( eps * ||A||_1  * N        ) =        0.0059082 ...... PASSED
+||Ax-b||_oo / ( eps * ||A||_1  * ||x||_1  ) =        0.0133907 ...... PASSED
+||Ax-b||_oo / ( eps * ||A||_oo * ||x||_oo ) =        0.0024480 ...... PASSED
+============================================================================
+</code>
+So a total of 2.455e+02 + 3.264e+0 or about 572 Gflops, 0.5 teraflops.
+===== BSS =====
+Since the cluster will be shut down December 28th we have an opportunity to run Linpack on the sharptail cluster.
+  * N calculation: 46 nodes, 24 gb per node for a total of 1,104 gb which yields 138 gb double precision (8 byte) elements … 138 gb is 138*1024*1024*1024 = 148,176,371,712 … take the square root of that and round 384936 … 80% of that is 307,950
+  * NB: start with 64, then 128, try 192 ...
+  * PxQ: perfect square of 9x10=92, close to the number of cores we have.
+Hmm, unable to make this work across all the nodes at the same time.  Not sure why.  My estimates are that with 92 cores and 1,126 gb of memory this cluster should be able to do 500-700 Gflops.

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