[petsc-users] [petsc-maint #107932] run a simple example ex19 in src/snes/examples/tutorials

[Xiangze Zeng]

After I changed the Mat type for using GPU, can I still use MatMPIAIJSetPreallocation to set preallocation?


I have add Petsc events in the code.The attachments are the outputs of log_summary (I'll configure --with-debugging=no later).
The fileinterface.c is my code in which set preallocation and insert matrices values.


Thank you.


Zeng


在 2012-03-16 19:43:38，"Jed Brown" <jedbrown at mcs.anl.gov> 写道：

2012/3/15 Xiangze Zeng <zengshixiangze at 163.com>

I can see log_summary output when I use -log_summary [filename].


But the time of inserting the matrices values is almost the same when I use PCJACOBI  to run the code on GPU instead of PCSOR.They are all much longer than that when I run the code in CPU(I still use a small system to test it). The attachments are outputs of log_summary, c_jacobi_sum is the output of using CPU, PCJACOBI;g_sor_sum using GPU, PCSOR;g_jac_sum using GPU, PCJACOBI. 


      ##########################################################
      #                                                        #
      #                          WARNING!!!                    #
      #                                                        #
      #   This code was compiled with a debugging option,      #
      #   To get timing results run ./configure                #
      #   using --with-debugging=no, the performance will      #
      #   be generally two or three times faster.              #
      #                                                        #
      ##########################################################


It's a waste of time to look at performance of a debug build, especially when it only takes half a second.


You have probably lost preallocation information. I don't see an assembly event, so I can't tell if that is really where the time is. (SNES makes one automatically, you can PetscLogEventRegister(), PetscLogEventBegin/End().
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