Unable to run demos in parallel

Question

Hello,

I've just downloaded FEniCs via dorsal and tried to run a few demos with mpirun but getting errors:

*** -------------------------------------------------------------------------
*** Error: Unable to partition mesh using SCOTCH.
*** Reason: Error during partitioning.
*** Where: This error was encountered inside SCOTCH.cpp.
*** Process: 15
*** DOLFIN version: 1.2.0+
*** Git changeset: 55bf4b010df788a25ba15d0ae7e4485761680132
*** -------------------------------------------------------------------------

I've tried the poisson, nonlinear-poison, hyperelasticity, optimization demos so far. I do
"cmake ." followed by "make" and then run them with: mpirun -np 24 ./demo_x

I'm on ubuntu 13.04.

I don't know why.
Thanks, Gennadiy

Comments

No one can help if you don't say what you're running and how you're running it.

---

I've edited the question and provided more details.

Answer 1

The demos are small programs, so start by running with a small number of processes, e.g. 2 to 6.

Comments

With 2 processes, I get the same error. Could it be because I downloaded the unstable version of 1.2.0 ?

Process 0: Number of global vertices: 1089
Process 0: Number of global cells: 2048
(0): ERROR: kdgraphMapRbMap: not implemented yet
(1): ERROR: kdgraphMapRbMap: not implemented yet
terminate called after throwing an instance of 'std::runtime_error'
what():

*** Error: Unable to partition mesh using SCOTCH.
*** Reason: Error during partitioning.
*** Where: This error was encountered inside SCOTCH.cpp.
*** Process: 0
*** DOLFIN version: 1.2.0+
*** Git changeset: 55bf4b010df788a25ba15d0ae7e4485761680132
*** -------------------------------------------------------------------------

terminate called after throwing an instance of 'std::runtime_error'
what():

*** -------------------------------------------------------------------------
*** Error: Unable to partition mesh using SCOTCH.
*** Reason: Error during partitioning.
*** Where: This error was encountered inside SCOTCH.cpp.
*** Process: 1
*** DOLFIN version: 1.2.0+
*** Git changeset: 55bf4b010df788a25ba15d0ae7e4485761680132
*** -------------------------------------------------------------------------