[petsc-users] Read in sequential, solve in parallel

[Moinier, Pierre (UK)]

Jed,

You are right I built the matrix from a Poisson problem using a 5pts
discretization.

I have now found out why I wasn't getting the correct scaling. That was
due to a silly mistake in submitting my executable.

With 4 cores, I get:
 
--- Event Stage 0: Main Stage

MatMult             1633 1.0 6.9578e+00 1.2 3.67e+09 1.0 9.8e+03 8.0e+03
0.0e+00 41 43100 59  0  41 43100 59  0  2110
MatAssemblyBegin       1 1.0 1.8351e-01182.2 0.00e+00 0.0 0.0e+00
0.0e+00 2.0e+00  0  0  0  0  0   0  0  0  0  0     0
MatAssemblyEnd         1 1.0 1.6289e-02 1.0 0.00e+00 0.0 1.2e+01 2.0e+03
7.0e+00  0  0  0  0  0   0  0  0  0  0     0
MatLoad                1 1.0 6.6239e-01 1.0 0.00e+00 0.0 2.1e+01 2.3e+06
9.0e+00  4  0  0 36  0   4  0  0 36  0     0
VecDot              3266 1.0 2.3861e+00 1.6 1.63e+09 1.0 0.0e+00 0.0e+00
3.3e+03 11 19  0  0 66  11 19  0  0 66  2737
VecNorm             1634 1.0 3.8494e+00 1.2 8.17e+08 1.0 0.0e+00 0.0e+00
1.6e+03 23 10  0  0 33  23 10  0  0 33   849
VecCopy             1636 1.0 1.0704e+00 1.3 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00  5  0  0  0  0   5  0  0  0  0     0
VecSet                 1 1.0 6.0201e-04 2.3 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00  0  0  0  0  0   0  0  0  0  0     0
VecAXPY             3266 1.0 2.0010e+00 1.2 1.63e+09 1.0 0.0e+00 0.0e+00
0.0e+00 11 19  0  0  0  11 19  0  0  0  3264
VecAYPX             1632 1.0 8.4769e-01 1.4 8.16e+08 1.0 0.0e+00 0.0e+00
0.0e+00  4 10  0  0  0   4 10  0  0  0  3850
VecAssemblyBegin       1 1.0 3.3454e-02477.3 0.00e+00 0.0 0.0e+00
0.0e+00 3.0e+00  0  0  0  0  0   0  0  0  0  0     0
VecAssemblyEnd         1 1.0 3.0994e-06 1.0 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00  0  0  0  0  0   0  0  0  0  0     0
VecLoad                1 1.0 7.2319e-02 1.0 0.00e+00 0.0 3.0e+00 2.0e+06
4.0e+00  0  0  0  5  0   0  0  0  5  0     0
VecScatterBegin     1633 1.0 2.4417e-02 2.3 0.00e+00 0.0 9.8e+03 8.0e+03
0.0e+00  0  0100 59  0   0  0100 59  0     0
VecScatterEnd       1633 1.0 1.0537e+0024.4 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00  3  0  0  0  0   3  0  0  0  0     0
KSPSetup               1 1.0 2.6400e-03 1.3 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00  0  0  0  0  0   0  0  0  0  0     0
KSPSolve               1 1.0 1.5425e+01 1.0 8.57e+09 1.0 9.8e+03 8.0e+03
4.9e+03 95100100 59 99  95100100 59100  2222
PCSetUp                1 1.0 0.0000e+00 0.0 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00  0  0  0  0  0   0  0  0  0  0     0
PCApply             1634 1.0 1.0700e+00 1.3 0.00e+00 0.0 0.0e+00 0.0e+00
0.0e+00  5  0  0  0  0   5  0  0  0  0     0


For a single core, I was getting 4.4828e+01 for KSPSolve.

I am correct to assume that what is listed as "Event Stage 0: Main
Stage" is common to each core? 

Finally, what is the meaning of "Event Stage 0: Main Stage"

Cheers,

	-Pierre.



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