Introduction MPI

• Distributed Memory, Message Passing
• OpenMPI(home, doc) as distributed memory programming environment
• Quick Reference Card for C (extended), very quick in C++
• The full MPI book
• excellent LLNL-tutorial on MPI
• nice paper
• Basic funtions
• rank, size 
• send, recv (blocking, synchronized)
• collective operations: reduce, gather, scatter, broadcast

• Scalar product [par/skalar]
• Avoid warnings caused by OpenMPI:
  make run  2>&1 | grep -v openmpi
• Greetings
• Show Jacobi iterative solver

• GNU: 
• Performance analyzer: gprof (kprof);   valgrind (kcachegrind)
• Memory analyzer: valgrind
• Thread analyzer: helgrind finds data race