[petsc-users] Petsc creates a random vector

[Matthew Knepley]

On Mon, Aug 17, 2015 at 11:02 AM, Xujun Zhao <xzhao99 at gmail.com> wrote:

> No. It gives the following error msg:
>

Did you build the executable?

  cd src/vec/vec/examples/tutorials
  make ex43

    Matt


> mpirun -np 2 ex43
>
> [proxy:0:0 at mcswl164.mcs.anl.gov] [proxy:0:0 at mcswl164.mcs.anl.gov]
> HYDU_create_process (utils/launch/launch.c:75): HYDU_create_process
> (utils/launch/launch.c:75): execvp error on file ex43 (No such file or
> directory)
>
> execvp error on file ex43 (No such file or directory)
>
> On Mon, Aug 17, 2015 at 10:57 AM, Matthew Knepley <knepley at gmail.com>
> wrote:
>
>> On Mon, Aug 17, 2015 at 10:49 AM, Xujun Zhao <xzhao99 at gmail.com> wrote:
>>
>>> Hi all,
>>>
>>> I want PETSc to generate random vector using VecSetRandom() following
>>> given examples, but failed and showed some "out of memory" error. The
>>> following is the code, which goes well until it reaches VecSetRandom(). Can
>>> anyone help me figure out the reason? Thanks a lot.
>>>
>>
>> Does src/vec/vec/examples/tests/ex43.c run for you?
>>
>>  Thanks,
>>
>>     Matt
>>
>>
>>> XZ
>>>
>>>
>>>
>>> --------------------------------------------------------------------------------------------
>>>   Vec             u;
>>>   PetscRandom     rand_ctx;     /* random number generator context */
>>>   PetscMPIInt     size, rank;
>>>   PetscInt        n, dn;
>>>
>>>
>>>   MPI_Comm_rank(PETSC_COMM_WORLD,&rank);//CHKERRQ(ierr);
>>>   MPI_Comm_size(PETSC_COMM_WORLD,&size);//CHKERRQ(ierr);
>>>   n  = N/size + 1;
>>>   dn = n*size - N;
>>>   if ( dn>0 && rank<dn ) n -= 1;
>>>   printf("--->test in petsc_random_vector(): rank = %d, n =
>>> %d\n",rank,n);
>>>
>>>
>>>   VecCreate(PETSC_COMM_WORLD,&u);
>>>   VecSetSizes(u,n,N);
>>>   PetscRandomCreate(PETSC_COMM_WORLD, &rand_ctx);
>>> #if defined(PETSC_HAVE_DRAND48)
>>>   PetscRandomSetType(rand_ctx,PETSCRAND48);
>>> #elif defined(PETSC_HAVE_RAND)
>>>   PetscRandomSetType(rand_ctx,PETSCRAND);
>>> #endif
>>>   PetscRandomSetFromOptions(rand_ctx);
>>>
>>>
>>>   VecSetRandom(u,rand_ctx);
>>>   PetscRandomDestroy(&rand_ctx);
>>>
>>
>>
>>
>> --
>> 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
>>
>
>


-- 
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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