[petsc-users] Petsc creates a random vector

[Xujun Zhao]

No. It gives the following error msg:

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
>
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