Collectives library

A shared library libmpib_coll.so implements different algorithms of collectives

• Basic algorithms of MPI collective operations (mostly linear)
• Tree-based algorithms of MPI collective operations (depends on the Boost C++ libraries)

The command-line arguments:

• verbose verbose mode (default: no)
• sgv scatterv/gatherv mode
  • 0 propagated on duplicated communicator (default)
  • 1 broadcasted counts
  • 2 propagated with tags: not safe
  • 3 everywhere-defined counts: not standard

Tools

• Test for MPI collective operations

Examples

• Substitute for native MPI collectives
• Test for tree builders
• Test for the tree-based scatterv/gatherv