[97] | 1 | .\"Copyright 2006-2008 Sun Microsystems, Inc. |
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| 2 | .\" Copyright (c) 1996 Thinking Machines Corporation |
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| 3 | .TH MPI_Type_contiguous 3 "Dec 08, 2009" "1.4" "Open MPI" |
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| 4 | .SH NAME |
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| 5 | \fBMPI_Type_contiguous\fP \- Creates a contiguous datatype. |
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| 6 | |
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| 7 | .SH SYNTAX |
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| 8 | .ft R |
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| 9 | .SH C Syntax |
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| 10 | .nf |
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| 11 | #include <mpi.h> |
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| 12 | int MPI_Type_contiguous(int \fIcount\fP, MPI_Datatype\fI oldtype\fP, |
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| 13 | MPI_Datatype\fI *newtype\fP) |
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| 14 | |
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| 15 | .SH Fortran Syntax |
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| 16 | .nf |
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| 17 | INCLUDE 'mpif.h' |
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| 18 | MPI_TYPE_CONTIGUOUS(\fICOUNT, OLDTYPE, NEWTYPE, IERROR\fP) |
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| 19 | INTEGER \fICOUNT, OLDTYPE, NEWTYPE, IERROR\fP |
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| 20 | |
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| 21 | .SH C++ Syntax |
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| 22 | .nf |
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| 23 | #include <mpi.h> |
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| 24 | Datatype Datatype::Create_contiguous(int \fIcount\fP) const |
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| 25 | |
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| 26 | .SH INPUT PARAMETERS |
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| 27 | .ft R |
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| 28 | .TP 1i |
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| 29 | count |
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| 30 | Replication count (nonnegative integer). |
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| 31 | .TP 1i |
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| 32 | oldtype |
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| 33 | Old datatype (handle). |
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| 34 | .sp |
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| 35 | .SH OUTPUT PARAMETERS |
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| 36 | .ft R |
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| 37 | .TP 1i |
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| 38 | newtype |
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| 39 | New datatype (handle). |
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| 40 | .ft R |
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| 41 | .TP 1i |
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| 42 | IERROR |
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| 43 | Fortran only: Error status (integer). |
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| 44 | |
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| 45 | .SH DESCRIPTION |
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| 46 | .ft R |
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| 47 | The simplest datatype constructor is MPI_Type_contiguous, which allows replication of a datatype into contiguous locations. |
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| 48 | .sp |
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| 49 | \fInewtype\fP is the datatype obtained by concatenating \fIcount\fP copies of \fIoldtype\fP. Concatenation is defined using the extent of \fIoldtype\fP as the size of the concatenated copies. |
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| 50 | .sp |
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| 51 | \fBExample:\fR Let oldtype have type map {(double, 0), (char, 8)}, with extent 16, and let count = 3. The type map of the datatype returned by newtype is |
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| 52 | .sp |
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| 53 | .nf |
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| 54 | {(double, 0), (char, 8), (double, 16), (char, 24), |
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| 55 | (double, 32), (char, 40)]; |
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| 56 | .fi |
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| 57 | .sp |
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| 58 | i.e., alternating double and char elements, with displacements 0, 8, 16, 24, 32, 40. |
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| 59 | .sp |
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| 60 | In general, assume that the type map of oldtype is |
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| 61 | .sp |
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| 62 | .nf |
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| 63 | {(type(0), disp(0)),...,(type(n-1), disp(n-1))}, |
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| 64 | .fi |
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| 65 | .sp |
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| 66 | with extent ex. Then newtype has a type map with count times n entries defined by: |
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| 67 | .sp |
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| 68 | .nf |
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| 69 | {(type(0), disp(0)), ...,(type(n-1), disp(n-1)), |
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| 70 | (type(0), disp(0) + ex), ...,(type(n-1), |
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| 71 | disp(n-1) + ex), ...,(type(0), disp(0) + ex * (count - 1)), |
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| 72 | ...,(type(n-1), disp(n-1) + ex * (count - 1))}. |
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| 73 | .fi |
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| 74 | .sp |
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| 75 | For more information about derived datatypes, see Section 3.12 of the MPI-1 Standard. |
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| 76 | |
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| 77 | .SH ERRORS |
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| 78 | Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ functions do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism will be used to throw an MPI:Exception object. |
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| 79 | .sp |
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| 80 | Before the error value is returned, the current MPI error handler is |
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| 81 | called. By default, this error handler aborts the MPI job, except for I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error. |
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| 82 | |
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