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1.2 Current Parallel Programming Paradigms - page 28 / 33

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1

2

3 4

MESSAGE MODES

19

Advice MPI IN

to users

It

is highly

PLACE for

the

non-atomic

recommended not collective mode.

to

use

Advice to implementors

All MPI collective operations can be

implemented by allocating internally a temporary receive bu er, executing the collective operations using the temporary receive bu er, executing a two-phase commit algorithm to ensure that ev- ery process has finished successfully and just copy in case that ev- ery process succeeded the result from the temporary receive bu er into the user-provided bu er. However, there are faster algorithms

for some operations available.

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