1 | .\"Copyright 2007-2008 Sun Microsystems, Inc. |
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2 | .\" Copyright (c) 1996 Thinking Machines Corporation |
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3 | .TH MPI_Lookup_name 3 "Dec 08, 2009" "1.4" "Open MPI" |
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4 | |
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5 | .SH NAME |
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6 | .nf |
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7 | \fBMPI_Lookup_name\fP \- Finds port associated with a service name |
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8 | |
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9 | .SH SYNTAX |
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10 | .ft R |
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11 | |
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12 | .SH C Syntax |
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13 | .nf |
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14 | #include <mpi.h> |
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15 | int MPI_Lookup_name(char *\fIservice_name\fP, MPI_Info \fIinfo\fP, |
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16 | char *\fIport_name\fP) |
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17 | |
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18 | .SH Fortran Syntax |
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19 | .nf |
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20 | INCLUDE 'mpif.h' |
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21 | MPI_LOOKUP_NAME(\fISERVICE_NAME, INFO, PORT_NAME, IERROR\fP) |
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22 | CHARACTER*(*) \fISERVICE_NAME, PORT_NAME\fP |
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23 | INTEGER \fIINFO, IERROR\fP |
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24 | |
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25 | .SH C++ Syntax |
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26 | .nf |
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27 | #include <mpi.h> |
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28 | void MPI::Lookup_name(const char *\fIservice_name\fP, const MPI::Info& \fIinfo\fP, |
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29 | char* \fIport_name\fP) |
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30 | |
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31 | .SH INPUT PARAMETERS |
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32 | .ft R |
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33 | .TP 1.4i |
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34 | service_name |
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35 | A service name (string). |
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36 | .TP 1.4i |
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37 | info |
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38 | Options to the name service functions (handle). |
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39 | |
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40 | .SH OUTPUT PARAMETERS |
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41 | .ft R |
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42 | .TP 1.4i |
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43 | port_name |
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44 | a port name (string). |
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45 | .TP 1.4i |
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46 | IERROR |
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47 | Fortran only: Error status (integer). |
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48 | |
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49 | .SH DESCRIPTION |
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50 | .ft R |
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51 | This function retrieves a \fIport_name\fP published under |
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52 | \fIservice_name\fP by a previous invocation of MPI_Publish_name. The |
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53 | application must supply a \fIport_name\fP buffer large enough to hold |
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54 | the largest possible port name (i.e., MPI_MAX_PORT_NAME bytes). |
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55 | |
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56 | .SH INFO ARGUMENTS |
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57 | The following keys for \fIinfo\fP are recognized: |
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58 | .sp |
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59 | .sp |
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60 | .nf |
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61 | Key Type Description |
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62 | --- ---- ----------- |
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63 | |
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64 | ompi_lookup_order char * Resolution order for name lookup. |
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65 | .fi |
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66 | |
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67 | The \fIompi_lookup_order\fP info key can specify one of four valid |
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68 | string values (see the NAME SCOPE section below for more information |
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69 | on name scopes): |
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70 | |
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71 | .TP 4 |
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72 | \fIlocal\fP: Only search the local scope for name resolution. |
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73 | .TP 4 |
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74 | \fIglobal\fP: Only search the global scope for name resolution. |
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75 | .TP 4 |
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76 | \fIlocal,global\fP: Search the local scope for name resolution. If |
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77 | not found, try searching the global scope for name resolution. This |
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78 | behavior is the default if the \fIompi_lookup_order\fP info key is not |
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79 | specified. |
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80 | .TP 4 |
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81 | \fIglobal,local\fP: Search the global scope for name resolution. If |
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82 | not found, try searching the local scope for name resolution. |
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83 | .PP |
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84 | If no info key is provided, the search will first check to see if a |
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85 | global server has been specified and is available. If so, then the |
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86 | search will default to global scope first, followed by local. Otherwise, |
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87 | the search will default to local. |
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88 | |
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89 | .SH NAME SCOPE |
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90 | Open MPI supports two name scopes: \fIglobal\fP and \fIlocal\fP. Local scope |
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91 | values are placed in a data store located on the mpirun of the calling |
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92 | process' job, while global scope values reside on a central server. Calls |
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93 | to MPI_Unpublish_name must correctly specify the scope to be used in |
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94 | finding the value to be removed. The function will return an error if |
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95 | the specified service name is not found on the indicated location. |
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96 | .sp |
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97 | For a more detailed description of scoping rules, please see the MPI_Publish_name |
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98 | man page. |
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99 | |
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100 | .SH ERRORS |
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101 | .ft R |
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102 | Almost all MPI routines return an error value; C routines as |
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103 | the value of the function and Fortran routines in the last argument. C++ |
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104 | functions do not return errors. If the default error handler is set to |
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105 | MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism |
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106 | will be used to throw an MPI:Exception object. |
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107 | .sp |
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108 | Before the error value is returned, the current MPI error handler is |
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109 | called. By default, this error handler aborts the MPI job, except for |
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110 | I/O function errors. The error handler may be changed with |
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111 | MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN |
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112 | may be used to cause error values to be returned. Note that MPI does not |
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113 | guarantee that an MPI program can continue past an error. |
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114 | .sp |
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115 | See the MPI man page for a full list of MPI error codes. |
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116 | |
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117 | .SH SEE ALSO |
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118 | .ft R |
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119 | .nf |
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120 | MPI_Publish_name |
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121 | MPI_Open_port |
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122 | |
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123 | |
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