[Users] Error in exe/cactus_sim

[Roland Haas]

Hello Rishank Diwan,

this sounds a bit like a mismatch between the MPI library used to
compile and the mpirun command used to run your code.

Can you provide file mpi.log produced by this code, please:

mpirun -n 2 exe/cactus_sim -S par/static_tov.par &>mpi.log

This can have multiple causes, one of them that there is no or multiple
MPI stacks installed. 

To check this, please run:

dpkg --list | grep -vi compile | grep -i mpi

and check that there is exactly one of the OpenMPI or MPICH packages
installed (you can also try "update-alternatives --list mpi" but it
will not catch everything if eg the MPICH development files but OpenMPI
runtime files are installed update-alternatives won't notice).

If there is no MPI stack installed at all, then you should consult:

https://nbviewer.jupyter.org/github/nds-org/jupyter-et/blob/master/CactusTutorial.ipynb

and follow the Debian/Ubuntu/Mint instructions to install an MPI stack
and the other recommended packages, then compile from scratch. After
making sure that there is no other MPI stack installed.

Finally you may want to check what MPI library your executable is
actually linked against by running:

dpkg -S $(readlink -f $(ldd exe/cactus_sim | gawk '/libmpi.so/{print
$3}'))

then running

dpkg -S $(readlink -f $(which mpirun))

and check that the two are compatible (ie from the same MPI stack).

Yours,
Roland

> Dear Sir/Madam
> 
> I am trying to compile a Cactus executable on my laptop, which has an
> 
> ubuntu-based operating system(Ubuntu 18.04). I am using the latest version
> i.e; ET_2019_10. I am using simfactory and following the Simulation Factory
> Advanced Tutorial. For building, I am using generic configuration files
> which are also the default files.
> 
> 
> Here are the steps I am using:
> 
> 
> simfactory/bin/sim setup
> 
> 
> ./simfactory/bin/sim build -j2 --thornlist ../einsteintoolkit.th
> 
> 
> Compilation produces an executable, but when I go for running the
> 
> example file using the command,
> 
> 
> exe/cactus_sim
> 
> 
> I get the following error.
> 
> ""
> 
> Fatal error in PMPI_Comm_rank: Invalid communicator, error stack:
> 
> PMPI_Comm_rank(110): MPI_Comm_rank(comm=0x8202540, rank=0x7ffcee11d818)
> 
> failed
> 
> PMPI_Comm_rank(68).: Invalid communicator
> 
> [unset]: write_line error; fd=-1 buf=:cmd=abort exitcode=805918213
> 
> :
> 
> system msg for write_line failure : Bad file descriptor
> 
> ""
> 
> 
> I am not able to find any relevant solution on the internet. Can you
> 
> please help me find in the solution.
> 
> 
> Yours Sincerely,
> 
> Rishank Diwan
> Pre-final Year Undergraduate Student
> Department of Physics
> Indian Institute of Technology, Kharagpur


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