[petsc-dev] [petsc-maint #87339] Re: ex19 on GPU

[Matthew Knepley]

On Sun, Sep 18, 2011 at 10:29 AM, Shiyuan <gshy2014 at gmail.com> wrote:

>
>
> On Sat, Sep 17, 2011 at 10:48 PM, Barry Smith <bsmith at mcs.anl.gov> wrote:
>
>>
>>  Run the first one  with -da_vec_type seqcusp and -da_mat_type seqaijcusp
>>
>> > VecScatterBegin     2097 1.0 1.0270e+00 1.0 0.00e+00 0.0 0.0e+00 0.0e+00
>> 0.0e+00  5  0  0  0  0   7  0  0  0  0     0
>> > VecCUSPCopyTo       2140 1.0 2.4991e-01 1.0 0.00e+00 0.0 0.0e+00 0.0e+00
>> 0.0e+00  1  0  0  0  0   2  0  0  0  0     0
>> > VecCUSPCopyFrom     2135 1.0 1.0437e+00 1.0 0.00e+00 0.0 0.0e+00 0.0e+00
>> 0.0e+00  5  0  0  0  0   7  0  0  0  0     0
>>
>>    Why is it doing all these vector copy ups and downs? It is run on one
>> process it shouldn't be doing more than a handful total.
>>
>>   Barry
>>
>> ./ex19 -da_vec_type seqcusp -da_mat_type seqaijcusp -pc_type none
> -dmmg_nlevels 1 -da_grid_x 100 -da_grid_y 100 -log_summary -mat_no_inode
> -preload off  -cusp_synchronize -cuda_set_device 0 | tee ex19p2.txt
>

Barry, it looks like all those are coming from FD Jacobians. Did someone
make this the default?

   Matt


> Summary of Stages:   ----- Time ------  ----- Flops -----  --- Messages
> ---  -- Message Lengths --  -- Reductions --
>                         Avg     %Total     Avg     %Total   counts
> %Total     Avg         %Total   counts   %Total
>  0:      Main Stage: 4.2393e+00  24.4%  0.0000e+00   0.0%  0.000e+00
> 0.0%  0.000e+00        0.0%  0.000e+00   0.0%
>  1:           SetUp: 4.9079e-02   0.3%  0.0000e+00   0.0%  0.000e+00
> 0.0%  0.000e+00        0.0%  0.000e+00   0.0%
>  2:           Solve: 1.3071e+01  75.3%  8.8712e+09 100.0%  0.000e+00
> 0.0%  0.000e+00        0.0%  0.000e+00   0.0%
>
>
> ------------------------------------------------------------------------------------------------------------------------
>
> VecScatterBegin        5 1.0 1.5609e-03 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
> VecReduceArith         2 1.0 3.8650e-03 1.0 1.60e+05 1.0 0.0e+00 0.0e+00
> 0.0e+00  0  0  0  0  0   0  0  0  0  0    41
>
> VecReduceComm          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
> VecCUSPCopyTo         49 1.0 3.0950e-02 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
> VecCUSPCopyFrom       44 1.0 2.0876e-02 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
>
> The complete log is attached.  Thanks.
>



-- 
What most experimenters take for granted before they begin their experiments
is infinitely more interesting than any results to which their experiments
lead.
-- Norbert Wiener
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