[petsc-dev] PETSC_USE_SOCKET_VIEWER macro - controlled by configure or not

[Satish Balay]

On Wed, 13 Jan 2010, Kevin.Buckley at ecs.vuw.ac.nz wrote:

> Hi there,
> 
> I am tying to help a researcher here build his application against
> a PETSc (3.0.0 p9) installtion at another site that seems to have
> undefined references to:
> 
> PETSC_VIEWER_SOCKET_

Is this unresolved symbol from user code? complete compile commands/
error messages are useful.

> 
> in it.
> 
> Looking at my local installtion, the undefined refs are seemingly
> fixed up in    libpetsc.a
> 
> ...
> send.o:
>          U MPI_Attr_get
>          U MPI_Attr_put
>          U MPI_Comm_rank
>          U MPI_Keyval_create
>          U OMPI_C_MPI_NULL_COPY_FN
>          U OMPI_C_MPI_NULL_DELETE_FN
> 00001a4a T PETSC_VIEWER_SOCKET_
> ...
> 
> however on the implementation that the researcher is looking to build
> against, that "T PETSC_VIEWER_SOCKET_" is not there.
> 
> 
> I noticed in the example config script for the Cray that there's a
> notification that:
> 
> ...
> # After running configure, remove the following flags from petscconf.h
> #
> # PETSC_HAVE_SYS_PROCFS_H
> # PETSC_HAVE_DLFCN_H
> ...
> ###### On Cray XT4 the following additional flags need removal ########
> #
> # PETSC_USE_SOCKET_VIEWER
> # PETSC_HAVE_GETPWUID
> ...
> 
> and think that this might be the problem here.
> 
> Am I right in thinking that PETSC_USE_SOCKET_VIEWER, the macro
> that determines whether PETSc compiles in any socket viewer code
> is not something that gets turned /onoff automatically by any
> option to configure  ?

There is a configure test for this - but cray supplies dummy socket
stubs - so configure succeeds - but the functionality doesn't
exist. [or it could be our configure test isn't as robust as it should
be]. The result is - some manual tweaking might be needed on cray
machines.

But I'm not sure if this problem still persists on the newer software
stacks on these machines. I don't remember having to do these edits on
the NERSC XT4.

Satish


> 
> Kevin
> 
>