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@@ -1,10 +1,18 @@
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.TH MPI_Op_create 3 "6/5/2019" " " "MPI"
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.TH MPI_Op_create 3 "2/3/2025" " " "MPI"
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.SH NAME
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MPI_Op_create \- Creates a user-defined combination function handle
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.SH SYNOPSIS
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.nf
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int MPI_Op_create(MPI_User_function * user_fn, int commute, MPI_Op * op)
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.fi
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.nf
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int MPI_Op_create(MPI_User_function *user_fn, int commute, MPI_Op *op)
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.fi
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.nf
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int MPI_Op_create_c(MPI_User_function_c *user_fn, int commute, MPI_Op *op)
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.fi
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.SH INPUT PARAMETERS
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.PD 0
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.TP
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@@ -14,7 +22,7 @@ int MPI_Op_create(MPI_User_function * user_fn, int commute, MPI_Op * op)
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.PD 0
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.TP
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.B commute
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- true if commutative; false otherwise. (logical)
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- true if commutative; false otherwise. (logical)
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.PD 1
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.SH OUTPUT PARAMETERS
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@@ -48,6 +56,23 @@ to the datatype given to the MPI collective computation routine (i.e.,
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) is also
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passed to the user-specified routine.
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.SH NOTES ON COLLECTIVE OPERATIONS
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The reduction functions (
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.I MPI_Op
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) do not return an error value. As a result,
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if the functions detect an error, all they can do is either call
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.I MPI_Abort
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or silently skip the problem. Thus, if you change the error handler from
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.I MPI_ERRORS_ARE_FATAL
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to something else, for example,
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.I MPI_ERRORS_RETURN
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,
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then no error may be indicated.
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The reason for this is the performance problems in ensuring that
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all collective routines return the same error value.
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.SH THREAD AND INTERRUPT SAFETY
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This routine is thread-safe. This means that this routine may be
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@@ -80,23 +105,6 @@ All MPI objects (e.g.,
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.I INTEGER
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in Fortran.
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.SH NOTES ON COLLECTIVE OPERATIONS
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The reduction functions (
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.I MPI_Op
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) do not return an error value. As a result,
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if the functions detect an error, all they can do is either call
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.I MPI_Abort
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or silently skip the problem. Thus, if you change the error handler from
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.I MPI_ERRORS_ARE_FATAL
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to something else, for example,
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.I MPI_ERRORS_RETURN
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,
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then no error may be indicated.
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The reason for this is the performance problems in ensuring that
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all collective routines return the same error value.
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.SH ERRORS
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All MPI routines (except
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@@ -122,7 +130,7 @@ its use is deprecated. The predefined error handler
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may be used to cause error values to be returned.
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Note that MPI does
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.B not
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guarentee that an MPI program can continue past
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guarantee that an MPI program can continue past
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an error; however, MPI implementations will attempt to continue whenever
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possible.
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@@ -131,6 +139,22 @@ possible.
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.B MPI_SUCCESS
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- No error; MPI routine completed successfully.
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.PD 1
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.PD 0
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.TP
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.B MPI_ERR_ARG
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- Invalid argument. Some argument is invalid and is not
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identified by a specific error class (e.g.,
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.I MPI_ERR_RANK
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).
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.PD 1
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.PD 0
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.TP
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.B MPI_ERR_OTHER
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- Other error; use
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.I MPI_Error_string
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to get more information
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about this error code.
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.PD 1
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.SH SEE ALSO
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MPI_Op_free
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