MPI datatype for structure of arrays -


in mpi application have distributed array of floats , 2 "parallel" arrays of integers: each float value there 2 associated integers describe corresponding value. sake of cache-efficiency want treat them 3 different arrays, i.e. structure of arrays, rather array of structures.

now, have gather these values first node. can in 1 communication instruction, defining mpi type, corresponding structure, 1 float , 2 integers. force me use array of structures pattern instead of structure of arrays one.

so, can choose between:

  • performing 3 different communications, 1 each array , keep efficient structure of arrays arrangement
  • defining mpi type, perform single communication, , deal resulting array of structures adjusting algorithm or rearranging data

do know third option allow me have best of both worlds, i.e. having single communication , keeping cache-efficient configuration?

you take take @ packing , unpacking.

http://www.mpi-forum.org/docs/mpi-11-html/node62.html

however, think if want pass same "structure" should define own mpi derivate type.


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