cartesian topology mapping improvements #12
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Some libraries require extra libraries in order to link, which is why AC_CHECK_LIB takes an "other-libraries" argument. Allow callers of PAC_SET_HEADER_LIB_PATH to supply extra libraries and pass them to AC_CHECK_LIB.
If no argument is supplied to AC_CHECK_LIB, a successful check will result in adding -l<library> to LIBS. Since we manage libraries separately from the LIBS variable, re-order the checks in PAC_CHECK_HEADER_LIB to avoid adding unwanted values.
Integrate Scotch library for use in MPICH. Scotch provides graph mapping functionality, which will be used to implement rank reordering features in MPI virtual topology functions. The initial integration builds a simple 2-level tree architecture representing the on/off node process mapping. Future enhancements may integrate hwloc and/or netloc information to build a more complex architecture graph.
Use Scotch to create a communication graph from the cartesian virtual topology info and map it to the node architecture.
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Pull Request Description
See issue pmodels#1654. This PR will implement mapping application virtual topologies to the physical machine topology.
Expected Impact
Author Checklist
module: short descriptionand follows good practicedoc/directory for any new code design