1997年8月6日 · Once this routine is called, no MPI routine (even MPI_INIT) may be called. The user must ensure that all pending communications involving a process completes before the process calls MPI_FINALIZE. MPI_INITIALIZED( flag ) [ OUT flag] Flag is true if MPI_INIT has been called and false otherwise. int MPI_Initialized(int *flag)

2015年6月4日 · Then, a call to MPI_INIT_THREAD will return provided = required; alternatively, a call to MPI_INIT will initialize the MPI thread support level to MPI_THREAD_SINGLE. Rationale. Various optimizations are possible when MPI code is executed single-threaded, or is executed on multiple threads, but not concurrently: mutual exclusion code may be omitted.

2009年9月10日 · Then MPI_INIT_THREAD will return provided = MPI_THREAD_MULTIPLE, irrespective of the value of required; a call to MPI_INIT will also initialize the MPI thread support level to MPI_THREAD_MULTIPLE. Suppose, on the other hand, that an MPI program has been started so that all four levels of thread support are available.

2015年6月4日 · The possible values and their semantics are identical to the ones that can be used with MPI_INIT_THREAD listed in Section MPI and Threads . The call returns in provided information about the actual level of thread support that will be provided by the MPI implementation for calls to MPI tool information interface routines.

2023年11月2日 · The procedures MPI_INIT and MPI_INIT_THREAD accept either the argc and argv that are provided by the arguments to main or NULL. Example Initializing MPI using MPI_INIT. The Fortran version takes only IERROR. Conforming implementations of MPI are required to allow applications to pass NULL for both the argc and argv arguments of main in C.

Martin Schulz, Technische Universität München Chair of the MPI Forum Panelists: l Ignacio Laguna, LLNL l Wesley Bland, Intel

2023年11月2日 · The possible values and their semantics are identical to the ones that can be used with MPI_INIT_THREAD listed in Section MPI and Threads. The call returns in provided information about the actual level of thread support that will be provided by the MPI implementation for calls to MPI tool information interface routines.

2001年9月10日 · Process 0 Process 1 ----- ----- MPI_Init(); MPI_Init(); MPI_Send (dest=1); MPI_Finalize(); MPI_Finalize(); A successful return from a blocking communication operation or from MPI_WAIT or MPI_TEST tells the user that the buffer can be reused and means that the communication is completed by the user, but does not guarantee that the local process ...

2015年6月4日 · Therefore, only its required subset must be present before MPI_INIT (or equivalent) and MPI implementations do not need to initialize the complete MPI datatype system. ( End of rationale. For variables of type MPI_INT , an MPI implementation can provide additional information by associating names with a fixed number of values.

2023年11月2日 · 10.3. Error Handling Up: MPI Environmental Management Next: Error Handlers for Communicators Previous: Memory Allocation