[petsc-dev] Kokkos/Crusher perforance

[Jed Brown]

Mark Adams <mfadams at lbl.gov> writes:

>>
>>
>>
>> > VecPointwiseMult     402 1.0 2.9605e-01 3.6 1.05e+08 1.0 0.0e+00 0.0e+00
>> 0.0e+00  0  0  0  0  0   5  1  0  0  0 22515   70608      0 0.00e+00    0
>> 0.00e+00 100
>> > VecScatterBegin      400 1.0 1.6791e-01 6.0 0.00e+00 0.0 3.7e+05 1.6e+04
>> 0.0e+00  0  0 62 54  0   2  0100100  0     0       0      0 0.00e+00    0
>> 0.00e+00  0
>> > VecScatterEnd        400 1.0 1.0057e+00 7.0 0.00e+00 0.0 0.0e+00 0.0e+00
>> 0.0e+00  0  0  0  0  0   5  0  0  0  0     0       0      0 0.00e+00    0
>> 0.00e+00  0
>> > PCApply              402 1.0 2.9638e-01 3.6 1.05e+08 1.0 0.0e+00 0.0e+00
>> 0.0e+00  0  0  0  0  0   5  1  0  0  0 22490   70608      0 0.00e+00    0
>> 0.00e+00 100
>>
>> Most of the MatMult time is attributed to VecScatterEnd here. Can you
>> share a run of the same total problem size on 8 ranks (one rank per GPU)?
>>
>>
> attached. I ran out of memory with the same size problem so this is the
> 262K / GPU version.

How was this launched? Is it possible all 8 ranks were using the same GPU? (Perf is that bad.)

>> From the other log file (10x bigger problem)
>>
>>
> ????

You had attached two files and the difference seemed to be that the second was 10x more dofs/rank.

> --- Event Stage 2: KSP Solve only
>
> MatMult              400 1.0 8.8003e+00 1.1 1.06e+11 1.0 2.2e+04 8.5e+04 0.0e+00  2 55 61 54  0  70 91100100  0 95058   132242      0 0.00e+00    0 0.00e+00 100
> MatView                2 1.0 1.1643e-03 1.8 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       0      0 0.00e+00    0 0.00e+00  0
> KSPSolve               2 1.0 1.2540e+01 1.0 1.17e+11 1.0 2.2e+04 8.5e+04 1.2e+03  3 60 61 54 60 100100100100100 73592   116796      0 0.00e+00    0 0.00e+00 100
> SFPack               400 1.0 1.8276e-03 1.2 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       0      0 0.00e+00    0 0.00e+00  0
> SFUnpack             400 1.0 6.2653e-05 1.6 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       0      0 0.00e+00    0 0.00e+00  0
> VecTDot              802 1.0 1.3551e+00 1.2 3.36e+09 1.0 0.0e+00 0.0e+00 8.0e+02  0  2  0  0 40  10  3  0  0 67 19627   52599      0 0.00e+00    0 0.00e+00 100
> VecNorm              402 1.0 9.0151e-01 2.2 1.69e+09 1.0 0.0e+00 0.0e+00 4.0e+02  0  1  0  0 20   5  1  0  0 33 14788   125477      0 0.00e+00    0 0.00e+00 100
> VecCopy                4 1.0 7.3905e-03 2.5 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       0      0 0.00e+00    0 0.00e+00  0
> VecSet                 4 1.0 3.1814e-03 1.8 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       0      0 0.00e+00    0 0.00e+00  0
> VecAXPY              800 1.0 8.2617e-01 1.0 3.36e+09 1.0 0.0e+00 0.0e+00 0.0e+00  0  2  0  0  0   7  3  0  0  0 32112   61644      0 0.00e+00    0 0.00e+00 100
> VecAYPX              398 1.0 8.1525e-01 1.6 1.67e+09 1.0 0.0e+00 0.0e+00 0.0e+00  0  1  0  0  0   5  1  0  0  0 16190   20689      0 0.00e+00    0 0.00e+00 100
> VecPointwiseMult     402 1.0 3.5694e-01 1.0 8.43e+08 1.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   3  1  0  0  0 18675   38633      0 0.00e+00    0 0.00e+00 100
> VecScatterBegin      400 1.0 1.3391e+00 2.6 0.00e+00 0.0 2.2e+04 8.5e+04 0.0e+00  0  0 61 54  0   7  0100100  0     0       0      0 0.00e+00    0 0.00e+00  0
> VecScatterEnd        400 1.0 1.3240e+00 1.3 0.00e+00 0.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   9  0  0  0  0     0       0      0 0.00e+00    0 0.00e+00  0
> PCApply              402 1.0 3.5712e-01 1.0 8.43e+08 1.0 0.0e+00 0.0e+00 0.0e+00  0  0  0  0  0   3  1  0  0  0 18665   38633      0 0.00e+00    0 0.00e+00 100