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cluster:91 [DokuWiki]

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cluster:91 [2010/12/28 13:50]
hmeij 		cluster:91 [2011/01/07 15:49] (current)
hmeij
Line 142: Line 142:
   * NB: start with 64, then 128, try 192 ...   * NB: start with 64, then 128, try 192 ...
   * PxQ: perfect square of 10x16=160, the number of cores we have   * 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> 
 + 
   * INFINIBAND   * 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   * 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 ...   * NB: start with 64, then 128, try 192 ...
   * PxQ: perfect square of 10x16=160, the number of cores we have   * 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.
  
  
Line 157: Line 184:
   * NB: start with 64, then 128, try 192 ...   * NB: start with 64, then 128, try 192 ...
   * PxQ: perfect square of 9x10=92, close to the number of cores we have.   * 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.
  
  
cluster/91.1293562211.txt.gz · Last modified: 2010/12/28 13:50 by hmeij

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