[Beowulf] hang-up of HPC Challenge
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Mikhail Kuzminsky kus at free.netWed Aug 20 10:52:51 PDT 2008
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In message from Greg Lindahl <lindahl at pbm.com> (Tue, 19 Aug 2008 19:39:38 -0700): >On Wed, Aug 20, 2008 at 03:45:43AM +0400, Mikhail Kuzminsky wrote: >> For some localization of possible problem reason, I ran pure HPL >>test >> instead of HPCC. HPL performs direct output to screen instead of >>writing >> to the file. >> >> Using MPICH w/np=8 I obtained normal HPL result for N=35000 - >>including >> 3 "PASSED" strings for ||Ax-b|| calculations. BUT ! Linux hang-ups >> immediately after output of this strings. > >Well, what did your configuration file tell HPL to do? Does it have >another test, perhaps a bigger one, or is it supposed to exit? We >aren't mind-readers. Pls sorry: I performed now 2 HPL run cases for the same N=10000, (1st) - "single" HPL run, i.e. ONE N=10000, ONE blocksize value, and ONE any other HPL.dat parameter. (2nd) - "multiple" HPL run w/same (one) N=10000 and blocksize=100, but with a sets of PFACTS etc (see the output below). 1st run finished successfully, 2nd lead to Linux hang-up. Yours Mikhail "single" HPL run : HPLinpack 1.0a -- High-Performance Linpack benchmark -- January 20, 2004 Written by A. Petitet and R. Clint Whaley, Innovative Computing Labs., UTK ============================================================================ An explanation of the input/output parameters follows: T/V : Wall time / encoded variant. N : The order of the coefficient matrix A. NB : The partitioning blocking factor. P : The number of process rows. Q : The number of process columns. Time : Time in seconds to solve the linear system. Gflops : Rate of execution for solving the linear system. The following parameter values will be used: N : 10000 NB : 100 PMAP : Row-major process mapping P : 2 Q : 4 PFACT : Right NBMIN : 4 NDIV : 2 RFACT : Crout BCAST : 1ringM DEPTH : 1 SWAP : Mix (threshold = 64) L1 : transposed form U : transposed form EQUIL : yes ALIGN : 16 double precision words ---------------------------------------------------------------------------- - The matrix A is randomly generated for each test. - The following scaled residual checks will be computed: 1) ||Ax-b||_oo / ( eps * ||A||_1 * N ) 2) ||Ax-b||_oo / ( eps * ||A||_1 * ||x||_1 ) 3) ||Ax-b||_oo / ( eps * ||A||_oo * ||x||_oo ) - The relative machine precision (eps) is taken to be 1.110223e-16 - Computational tests pass if scaled residuals are less than 16.0 ============================================================================ T/V N NB P Q Time Gflops ---------------------------------------------------------------------------- WR11C2R4 10000 100 2 4 23.32 2.859e+01 ---------------------------------------------------------------------------- ||Ax-b||_oo / ( eps * ||A||_1 * N ) = 0.0767386 ...... PASSED ||Ax-b||_oo / ( eps * ||A||_1 * ||x||_1 ) = 0.0181586 ...... PASSED ||Ax-b||_oo / ( eps * ||A||_oo * ||x||_oo ) = 0.0040588 ...... PASSED ============================================================================ Finished 1 tests with the following results: 1 tests completed and passed residual checks, 0 tests completed and failed residual checks, 0 tests skipped because of illegal input values. ---------------------------------------------------------------------------- End of Tests. ============================================================================ [1]+ Done mpirun -np 8 xhpl "multiple" HPL run: HPLinpack 1.0a -- High-Performance Linpack benchmark -- January 20, 2004 Written by A. Petitet and R. Clint Whaley, Innovative Computing Labs., UTK ============================================================================ An explanation of the input/output parameters follows: T/V : Wall time / encoded variant. N : The order of the coefficient matrix A. NB : The partitioning blocking factor. P : The number of process rows. Q : The number of process columns. Time : Time in seconds to solve the linear system. Gflops : Rate of execution for solving the linear system. The following parameter values will be used: N : 10000 NB : 100 PMAP : Row-major process mapping P : 2 Q : 4 PFACT : Left Crout Right NBMIN : 2 4 NDIV : 2 RFACT : Left Crout Right BCAST : 1ring DEPTH : 0 SWAP : Mix (threshold = 64) L1 : transposed form U : transposed form EQUIL : yes ALIGN : 16 double precision words ---------------------------------------------------------------------------- - The matrix A is randomly generated for each test. - The following scaled residual checks will be computed: 1) ||Ax-b||_oo / ( eps * ||A||_1 * N ) 2) ||Ax-b||_oo / ( eps * ||A||_1 * ||x||_1 ) 3) ||Ax-b||_oo / ( eps * ||A||_oo * ||x||_oo ) - The relative machine precision (eps) is taken to be 1.110223e-16 - Computational tests pass if scaled residuals are less than 16.0 ============================================================================ T/V N NB P Q Time Gflops ---------------------------------------------------------------------------- WR00L2L2 10000 100 2 4 23.02 2.897e+01 ---------------------------------------------------------------------------- ||Ax-b||_oo / ( eps * ||A||_1 * N ) = 0.0980967 ...... PASSED ||Ax-b||_oo / ( eps * ||A||_1 * ||x||_1 ) = 0.0232126 ...... PASSED ||Ax-b||_oo / ( eps * ||A||_oo * ||x||_oo ) = 0.0051885 ...... PASSED ============================================================================ T/V N NB P Q Time Gflops ---------------------------------------------------------------------------- WR00L2L4 10000 100 2 4 22.97 2.903e+01 ---------------------------------------------------------------------------- ||Ax-b||_oo / ( eps * ||A||_1 * N ) = 0.0832258 ...... PASSED ||Ax-b||_oo / ( eps * ||A||_1 * ||x||_1 ) = 0.0196937 ...... PASSED ||Ax-b||_oo / ( eps * ||A||_oo * ||x||_oo ) = 0.0044019 ...... PASSED ============================================================================ T/V N NB P Q Time Gflops ---------------------------------------------------------------------------- WR00L2C2 10000 100 2 4 22.95 2.905e+01 ---------------------------------------------------------------------------- ||Ax-b||_oo / ( eps * ||A||_1 * N ) = 0.0980967 ...... PASSED ||Ax-b||_oo / ( eps * ||A||_1 * ||x||_1 ) = 0.0232126 ...... PASSED ||Ax-b||_oo / ( eps * ||A||_oo * ||x||_oo ) = 0.0051885 ...... PASSED ... and here Linux hangs ... > >-- greg > > >_______________________________________________ >Beowulf mailing list, Beowulf at beowulf.org >To change your subscription (digest mode or unsubscribe) visit >http://www.beowulf.org/mailman/listinfo/beowulf
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