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NAME

       Constants -  Meaning of MPI's defined constants

DATA TYPES

       Note  that  the  Fortran  types  should  only be used in Fortran programs, and the C types
       should only be used in C programs.  For example, it is in  error  to  use  MPI_INT  for  a
       Fortran  INTEGER.   Datatypes  are of type MPI_Datatype in C, type INTEGER in Fortran, and
       Type(MPI_Datatype) in Fortran08

C DATATYPES

       MPI_CHAR
              - char
       MPI_SIGNED_CHAR
              - signed char
       MPI_UNSIGNED_CHAR
              - unsigned char
       MPI_BYTE
              - See standard; like unsigned char
       MPI_WCHAR
              - wide character (wchar_t)
       MPI_SHORT
              - short
       MPI_UNSIGNED_SHORT
              - unsigned short
       MPI_INT
              - int
       MPI_UNSIGNED
              - unsigned int
       MPI_LONG
              - long
       MPI_UNSIGNED_LONG
              - unsigned long
       MPI_LONG_LONG_INT
              - long long
       MPI_LONG_LONG
              - synonyn for MPI_LONG_LONG_INT

       MPI_UNSIGNED_LONG_LONG
              - unsigned long long
       MPI_FLOAT
              - float
       MPI_DOUBLE
              - double
       MPI_LONG_DOUBLE
              - long double (some systems may not implement this)
       MPI_INT8_T
              - int8_t
       MPI_INT16_T
              - int16_t
       MPI_INT32_T
              - int32_t
       MPI_INT64_T
              - int64_t
       MPI_UINT8_T
              - uint8_t
       MPI_UINT16_T
              - uint16_t
       MPI_UINT32_T
              - uint32_t
       MPI_UINT64_T
              - uint64_t
       MPI_C_BOOL
              - _Bool
       MPI_C_FLOAT_COMPLEX
              - float _Complex
       MPI_C_COMPLEX
              - float _Complex
       MPI_C_DOUBLE_COMPLEX
              - double _Complex
       MPI_C_LONG_DOUBLE_COMPLEX
              - long double _Complex

              The following are datatypes for the MPI functions MPI_MAXLOC and MPI_MINLOC .

       MPI_FLOAT_INT
              - struct { float, int }

       MPI_LONG_INT
              - struct { long, int }

       MPI_DOUBLE_INT
              - struct { double, int }

       MPI_SHORT_INT
              - struct { short, int }

       MPI_2INT
              - struct { int, int }

       MPI_LONG_DOUBLE_INT
              - struct { long double, int } ; this is  an  optional  type,  and  may  be  set  to
              MPI_DATATYPE_NULL

              Special datatypes for C and Fortran
       MPI_PACKED
              - For MPI_Pack and MPI_Unpack

       MPI_UB - For MPI_Type_struct ; an upper-bound indicator.  Removed in MPI 3
       MPI_LB - For MPI_Type_struct ; a lower-bound indicator. Removed in MPI 3

FORTRAN DATATYPES

       MPI_REAL
              - REAL

       MPI_INTEGER
              - INTEGER

       MPI_LOGICAL
              - LOGICAL

       MPI_DOUBLE_PRECISION
              - DOUBLE PRECISION

       MPI_COMPLEX
              - COMPLEX

       MPI_DOUBLE_COMPLEX
              - complex*16 (or complex*32 ) where supported.

              The following datatypes are optional
       MPI_INTEGER1
              - integer*1 if supported
       MPI_INTEGER2
              - integer*2 if supported
       MPI_INTEGER4
              - integer*4 if supported
       MPI_INTEGER8
              - integer*8 if supported
       MPI_INTEGER16
              - integer*16 if supported
       MPI_REAL4
              - real*4 if supported
       MPI_REAL8
              - real*8 if supported
       MPI_REAL16
              - real*16 if supported
       MPI_COMPLEX8
              - complex*8 if supported
       MPI_COMPLEX16
              - complex*16 if supported
       MPI_COMPLEX32
              - complex*32 if supported

              The  following  are datatypes for the MPI functions MPI_MAXLOC and MPI_MINLOC .  In
              Fortran, these datatype always consist of two elements of the same Fortran type.
       MPI_2INTEGER
              - INTEGER,INTEGER

       MPI_2REAL
              - REAL, REAL

       MPI_2DOUBLE_PRECISION
              - DOUBLE PRECISION, DOUBLE PRECISION

              MPI Datatypes for MPI Types
       MPI_AINT
              - Datatype for an MPI_Aint

       MPI_OFFSET
              - Datatype for an MPI_Offset

       MPI_COUNT
              - Datatype for an MPI_Count

MPI DATATYPE COMBINER NAMES

       MPI_COMBINER_NAMED
              - a named predefined datatype
       MPI_COMBINER_DUP
              - MPI_TYPE_DUP
       MPI_COMBINER_CONTIGUOUS
              - MPI_TYPE_CONTIGUOUS
       MPI_COMBINER_VECTOR
              - MPI_TYPE_VECTOR
       MPI_COMBINER_HVECTOR_INTEGER
              - Removed in MPI-3
       MPI_COMBINER_HVECTOR
              - MPI_TYPE_CREATE_HVECTOR
       MPI_COMBINER_INDEXED
              - MPI_TYPE_INDEXED
       MPI_COMBINER_HINDEXED_INTEGER
              - Removed in MPI-3
       MPI_COMBINER_HINDEXED
              - MPI_TYPE_CREATE_HINDEXED
       MPI_COMBINER_INDEXED_BLOCK
              - MPI_TYPE_CREATE_INDEXED_BLOCK
       MPI_COMBINER_STRUCT_INTEGER
              - Removed in MPI-3
       MPI_COMBINER_STRUCT
              - MPI_TYPE_CREATE_STRUCT
       MPI_COMBINER_SUBARRAY
              - MPI_TYPE_CREATE_SUBARRAY
       MPI_COMBINER_DARRAY
              - MPI_TYPE_CREATE_DARRAY
       MPI_COMBINER_F90_REAL
              - MPI_TYPE_CREATE_F90_REAL
       MPI_COMBINER_F90_COMPLEX
              - MPI_TYPE_CREATE_F90_COMPLEX
       MPI_COMBINER_F90_INTEGER
              - MPI_TYPE_CREATE_F90_INTEGER
       MPI_COMBINER_RESIZED
              - MPI_TYPE_CREATE_RESIZED
       MPI_COMBINER_HINDEXED_BLOCK
              - MPI_TYPE_CREATE_HINDEXED_BLOCK

MPI DATATYPE TYPE CLASSES

       MPI Type classes used with routines to return Fortran types  with  defined  precision  and
       range
       MPI_TYPECLASS_REAL
              - REAL

       MPI_TYPECLASS_INTEGER
              - INTEGER

       MPI_TYPECLASS_COMPLEX
              - COMPLEX

MPI DARRAY AND SUBARRAY VALUES

       These values are used to create a datatype with the DARRAY and SUBARRAY constructors.
       MPI_ORDER_C
              - Row-major order (as used by C)
       MPI_ORDER_FORTRAN
              - Column-major order (as used by Fortran)
       MPI_DISTRIBUTE_BLOCK
              - Block distribution
       MPI_DISTRIBUTE_CYCLIC
              - Cyclic distribution
       MPI_DISTRIBUTE_NONE
              - This dimension is not distributed
       MPI_DISTRIBUTE_DFLT_DARG
              - Use the default distribution

COMMUNICATORS

       Communicators  are  of  type  MPI_Comm  in  C,  INTEGER  in Fortran, and Type(MPI_Comm) in
       Fortran08
       MPI_COMM_WORLD
              - Contains all of the processes
       MPI_COMM_SELF
              - Contains only the calling process

KIND OF COMMUNICATOR FOR 'MPI_COMM_SPLIT_TYPE'

       MPI_COMM_TYPE_SHARED
              - All processes that can share memory are grouped into the same communicator.

GROUPS

       Groups are of type MPI_Group in C, INTEGER in Fortran, and Type(MPI_Group) in Fortran08

       MPI_GROUP_EMPTY
              - A group containing no members.

RESULTS OF THE COMPARE OPERATIONS ON GROUPS AND COMMUNICATORS

       MPI_IDENT
              - Identical
       MPI_CONGRUENT
              - (only for MPI_COMM_COMPARE ) The groups are identical
       MPI_SIMILAR
              - Same members, but in a different order
       MPI_UNEQUAL
              - Different

COLLECTIVE OPERATIONS

       The   collective   combination   operations   (e.g.,   MPI_REDUCE   ,   MPI_ALLREDUCE    ,
       MPI_REDUCE_SCATTER  ,  and  MPI_SCAN ) take a combination operation.  This operation is of
       type MPI_Op in C and of type INTEGER in Fortran.  The predefined operations are

       MPI_MAX
              - return the maximum
       MPI_MIN
              - return the minimum
       MPI_SUM
              - return the sum
       MPI_PROD
              - return the product
       MPI_LAND
              - return the logical and
       MPI_BAND
              - return the bitwise and
       MPI_LOR
              - return the logical or
       MPI_BOR
              - return the bitwise of
       MPI_LXOR
              - return the logical exclusive or
       MPI_BXOR
              - return the bitwise exclusive or
       MPI_MINLOC
              - return the minimum and the location (actually, the value of the second element of
              the structure where the minimum of the first is found)
       MPI_MAXLOC
              - return the maximum and the location
       MPI_REPLACE
              - replace b with a
       MPI_NO_OP
              - perform no operation

NOTES ON COLLECTIVE OPERATIONS

       The  reduction  functions  (  MPI_Op  ) do not return an error value.  As a result, if the
       functions detect an error, all they can do is either call MPI_Abort or silently  skip  the
       problem.   Thus,  if  you  change the error handler from MPI_ERRORS_ARE_FATAL to something
       else, for example, MPI_ERRORS_RETURN , then no error may be indicated.

       The reason for this is the performance problems in ensuring that all  collective  routines
       return the same error value.

       Note  that  not  all datatypes are valid for these functions.  For example, MPI_COMPLEX is
       not valid for MPI_MAX and MPI_MIN .  In addition, the MPI 1.1 standard did not include the
       C  types MPI_CHAR and MPI_UNSIGNED_CHAR among the lists of arithmetic types for operations
       like MPI_SUM .  However, since the C type char is an integer type (like short ), it should
       have  been  included.   The  MPI  Forum  will probably include char and unsigned char as a
       clarification to MPI 1.1; until then, users are advised that MPI implementations  may  not
       accept  MPI_CHAR  and  MPI_UNSIGNED_CHAR  as valid datatypes for MPI_SUM , MPI_PROD , etc.
       MPICH does allow these datatypes.

PERMANENT KEY VALUES

       These are the same in C and Fortran

       MPI_TAG_UB
              - Largest tag value
       MPI_HOST
              - Rank of process that is host, if any
       MPI_IO - Rank of process that can do I/O
       MPI_WTIME_IS_GLOBAL
              - Has value 1 if MPI_WTIME is globally synchronized.
       MPI_UNIVERSE_SIZE
              - Number of available processes.  See the standard for a description of limitations
              on this value
       MPI_LASTUSEDCODE
              - Last used MPI error code (check - code or class?)
       MPI_APPNUM
              -    Application    number,    starting    from    0.    See   the   standard   for
              MPI_COMM_SPAWN_MULTIPLE and mpiexec for details

NULL OBJECTS

       MPI_COMM_NULL
              - Null communicator
       MPI_OP_NULL
              - Null operation
       MPI_GROUP_NULL
              - Null group
       MPI_DATATYPE_NULL
              - Null datatype
       MPI_REQUEST_NULL
              - Null request
       MPI_ERRHANDLER_NULL
              - Null error handler
       MPI_WIN_NULL
              - Null window handle
       MPI_FILE_NULL
              - Null file handle
       MPI_INFO_NULL
              - Null info handle
       MPI_MESSAGE_NULL
              - Null message handle
       MPI_ARGV_NULL
              - Empty ARGV value for spawn commands
       MPI_ARGVS_NULL
              - Empty ARGV array for spawn-multiple command
       MPI_T_ENUM_NULL
              - Null MPI_T enum
       MPI_T_CVAR_HANDLE_NULL
              - Null MPI_T control variable handle
       MPI_T_PVAR_HANDLE_NULL
              - Null MPI_T performance variable handle
       MPI_T_PVAR_SESSION_NULL
              - Null MPI_T performance variable session handle

PREDEFINED CONSTANTS

       MPI_MAX_PROCESSOR_NAME
              - Maximum length of name returned by MPI_GET_PROCESSOR_NAME

       MPI_MAX_ERROR_STRING
              - Maximum length of string return by MPI_ERROR_STRING

       MPI_MAX_LIBRARY_VERSION_STRING
              - Maximum length of string returned by MPI_GET_LIBRARY_VERSION_STRING ???
       MPI_MAX_PORT_NAME
              - Maximum length of a port
       MPI_MAX_OBJECT_NAME
              - Maximum length of an object (?)
       MPI_MAX_INFO_KEY
              - Maximum length of an info key
       MPI_MAX_INFO_VAL
              - Maximum length of an info value
       MPI_UNDEFINED
              - Used by many routines to indicated undefined or unknown integer value
       MPI_UNDEFINED_RANK
              - Unknown rank
       MPI_KEYVAL_INVALID
              - Special keyval that may be used to detect uninitialized keyvals.
       MPI_BSEND_OVERHEAD
              - Add this to the size of a MPI_BSEND buffer for each outstanding message
       MPI_PROC_NULL
              - This rank may be used to send or receive from no-one.
       MPI_ANY_SOURCE
              - In a receive, accept a message from anyone.
       MPI_ANY_TAG
              - In a receive, accept a message with any tag value.
       MPI_BOTTOM
              - May be used to indicate the bottom of the address space
       MPI_IN_PLACE
              - Special location for buffer in some collective communication routines
       MPI_VERSION
              - Numeric value of MPI version (e.g., 3)
       MPI_SUBVERSION
              - Numeric value of MPI subversion (e.g., 1)

TOPOLOGY TYPES

       MPI_CART
              - Cartesian grid
       MPI_GRAPH
              - General graph
       MPI_DIST_GRAPH
              - General distributed graph

SPECIAL VALUES FOR DISTRIBUTED GRAPH

       MPI_UNWEIGHTED
              - Indicates that the edges are unweighted
       MPI_WEIGHTS_EMPTY
              - Special address that indicates no array of weights information

FILE MODES

       MPI_MODE_RDONLY
              - Read only
       MPI_MODE_RDWR
              - Read and write
       MPI_MODE_WRONLY
              - Write only
       MPI_MODE_CREATE
              - Create the file if it does not exist
       MPI_MODE_EXCL
              - It is an error if creating a file that already exists
       MPI_MODE_DELETE_ON_CLOSE
              - Delete the file on close
       MPI_MODE_UNIQUE_OPEN
              - The file will not be concurrently opened elsewhere
       MPI_MODE_APPEND
              - The initial position of all file pointers is at the end of the file
       MPI_MODE_SEQUENTIAL
              - File will only be accessed sequentially

FILE DISPLACEMENT

       MPI_DISPLACEMENT_CURRENT
              - Use with files opened with mode MPI_MODE_SEQUENTIAL in calls to MPI_FILE_SET_VIEW

FILE POSITIONING

       MPI_SEEK_SET
              - Set the pointer to offset

       MPI_SEEK_CUR
              - Set the pointer to the current position plus offset

       MPI_SEEK_END
              - Set the pointer to the end of the file plus offset

WINDOW ATTRIBUTES

       MPI_WIN_BASE
              - window base address.
       MPI_WIN_SIZE
              - window size, in bytes
       MPI_WIN_DISP_UNIT
              - displacement unit associated with the window
       MPI_WIN_CREATE_FLAVOR
              - how the window was created
       MPI_WIN_MODEL
              - memory model for window

WINDOW FLAVORS

       MPI_WIN_FLAVOR_CREATE
              - Window was created with MPI_WIN_CREATE.
       MPI_WIN_FLAVOR_ALLOCATE
              - Window was created with MPI_WIN_ALLOCATE.
       MPI_WIN_FLAVOR_DYNAMIC
              - Window was created with MPI_WIN_CREATE_DYNAMIC.
       MPI_WIN_FLAVOR_SHARED
              - Window was created with MPI_WIN_ALLOCATE_SHARED.

WINDOW MEMORY MODEL

       MPI_WIN_SEPARATE
              - Separate public and private copies of window memory
       MPI_WIN_UNIFIED
              - The public and private copies are identical (by which we mean  that  updates  are
              eventually observed without additional RMA operations)

WINDOW LOCK TYPES

       MPI_LOCK_EXCLUSIVE
              - Only one process at a time will execute accesses within the lock
       MPI_LOCK_SHARED
              - Not exclusive; multiple processes may execute accesses within the lock

WINDOW ASSERTIONS

       See section 11.5 in MPI 3.1 for a detailed description of each of these assertion values.
       MPI_MODE_NOCHECK
              - The matching calls to MPI_WIN_POST or MPI_WIN_START have already completed, or no
              process holds or will attempt to acquire, a conflicting lock.
       MPI_MODE_NOSTORE
              - The local window has not been updated by stores since the last synchronization
       MPI_MODE_NOPUT
              - The local window will not  be  updated  by  put  or  accumulate  until  the  next
              synchronization
       MPI_MODE_NOPRECEDE
              - The fence does not complete any locally issued RMA calls
       MPI_MODE_NOSUCCEED
              - The fence does not start any locally issued RMA calls

PREDEFINED INFO OBJECT

       MPI_INFO_ENV
              - Contains the execution environment

MPI STATUS

       The  MPI_Status  datatype  is a structure in C.  The three elements for use by programmers
       are
       MPI_SOURCE
              - Who sent the message
       MPI_TAG
              - What tag the message was sent with
       MPI_ERROR
              - Any error return (only when the error returned by the  routine  has  error  class
              MPI_ERR_IN_STATUS )

       MPI_STATUS_IGNORE
              - Ignore a single MPI_Status argument
       MPI_STATUSES_IGNORE
              - Ignore an array of MPI_Status

SPECIAL VALUE FOR ERROR CODES ARRAY

       MPI_ERRCODES_IGNORE
              - Ignore an array of error codes

MPI_T CONSTANTS

       MPI_T_VERBOSITY_USER_BASIC
              - Basic information of interest to users
       MPI_T_VERBOSITY_USER_DETAIL
              - Detailed information of interest to users
       MPI_T_VERBOSITY_USER_ALL
              - All remaining information of interest to users
       MPI_T_VERBOSITY_TUNER_BASIC
              - Basic information required for tuning
       MPI_T_VERBOSITY_TUNER_DETAIL
              - Detailed information required for tuning
       MPI_T_VERBOSITY_TUNER_ALL
              - All remaining information required for tuning
       MPI_T_VERBOSITY_MPIDEV_BASIC
              - Basic information for MPI implementors

       MPI_T_VERBOSITY_MPIDEV_DETAIL
              - Detailed information for MPI implementors
       MPI_T_VERBOSITY_MPIDEV_ALL
              - All remaining information for MPI implementors
       MPI_T_BIND_NO_OBJECT
              - Applies globally to entire MPI process
       MPI_T_BIND_MPI_COMM
              - MPI communicators
       MPI_T_BIND_MPI_DATATYPE
              - MPI datatypes
       MPI_T_BIND_MPI_ERRHANDLER
              - MPI error handlers
       MPI_T_BIND_MPI_FILE
              - MPI file handles
       MPI_T_BIND_MPI_GROUP
              - MPI groups
       MPI_T_BIND_MPI_OP
              - MPI reduction operators
       MPI_T_BIND_MPI_REQUEST
              - MPI requests
       MPI_T_BIND_MPI_WIN
              - MPI windows for one-sided communication
       MPI_T_BIND_MPI_MESSAGE
              - MPI message object
       MPI_T_BIND_MPI_INFO
              - MPI info object
       MPI_T_SCOPE_CONSTANT
              - read-only, value is constant
       MPI_T_SCOPE_READONLY
              - read-only, cannot be written, but can change
       MPI_T_SCOPE_LOCAL
              - may be writeable, writing is a local operation
       MPI_T_SCOPE_GROUP
              -  may be writeable, must be done to a group of processes, all processes in a group
              must be set to consistent values
       MPI_T_SCOPE_GROUP_EQ
              - may be writeable, must be done to a group of processes, all processes in a  group
              must be set to the same value
       MPI_T_SCOPE_ALL
              -  may be writeable, must be done to all processes, all connected processes must be
              set to consistent values
       MPI_T_SCOPE_ALL_EQ
              - may be writeable, must be done to all processes, all connected processes must  be
              set to the same value
       MPI_T_PVAR_CLASS_STATE
              - set of discrete states (MPI_INT)
       MPI_T_PVAR_CLASS_LEVEL
              - utilization level of a resource
       MPI_T_PVAR_CLASS_SIZE
              - size of a resource
       MPI_T_PVAR_CLASS_PERCENTAGE
              - percentage utilization of a resource
       MPI_T_PVAR_CLASS_HIGHWATERMARK
              - high watermark of a resource
       MPI_T_PVAR_CLASS_LOWWATERMARK
              - low watermark of a resource
       MPI_T_PVAR_CLASS_COUNTER
              - number of occurrences of an event
       MPI_T_PVAR_CLASS_AGGREGATE
              - aggregate value over an event (e.g., sum of all memory allocations)
       MPI_T_PVAR_CLASS_TIMER
              - aggretate time spent executing event
       MPI_T_PVAR_CLASS_GENERIC
              - used for any other time of performance variable

THREAD LEVELS

       MPI_THREAD_SINGLE
              - Only one thread executes
       MPI_THREAD_FUNNELED
              - Only the main thread makes MPI calls
       MPI_THREAD_SERIALIZED
              - Only one thread at a time makes MPI calls
       MPI_THREAD_MULTIPLE
              - Multiple threads may make MPI calls

SPECIAL MPI TYPES AND FUNCTIONS

       MPI_Aint
              - C type that holds any valid address.
       MPI_Count
              - C type that holds any valid count.
       MPI_Offset
              - C type that holds any valid file offset.
       MPI_Handler_function
              - C function for handling errors (see MPI_Errhandler_create ) .
       MPI_User_function
              - C function to combine values (see collective operations and MPI_Op_create )
       MPI_Copy_function
              - Function to copy attributes (see MPI_Keyval_create )
       MPI_Delete_function
              - Function to delete attributes (see MPI_Keyval_create )
       MPI_ERRORS_ARE_FATAL
              - Error handler that forces exit on error
       MPI_ERRORS_RETURN
              -  Error handler that returns error codes (as value of MPI routine in C and through
              last argument in Fortran)
       MPI_ERRORS_ABORT
              - Error handler that forces exit on error (only aborts local process if  the  error
              handler is invoked on a session)

MPI ATTRIBUTE DEFAULT FUNCTIONS

       MPI_COMM_NULL_COPY_FN
              - Predefined attribute copy function for communicators
       MPI_COMM_NULL_DELETE_FN
              - Predefined attribute delete function for communicators
       MPI_COMM_DUP_FN
              - Predefined attribute duplicate function for communicators
       MPI_WIN_NULL_COPY_FN
              - Predefined attribute copy function for windows
       MPI_WIN_NULL_DELETE_FN
              - Predefined attribute delete function for windows
       MPI_WIN_DUP_FN
              - Predefined attribute duplicate function for windows
       MPI_TYPE_NULL_COPY_FN
              - Predefined attribute copy function for datatypes
       MPI_TYPE_NULL_DELETE_FN
              - Predefined attribute delete function for datatypes
       MPI_TYPE_DUP_FN
              - Predefined attribute duplicate function for datatypes

MPI-1 ATTRIBUTE DEFAULT FUNCTIONS

       MPI_NULL_COPY_FN
              - Predefined copy function
       MPI_NULL_DELETE_FN
              - Predefined delete function
       MPI_DUP_FN
              - Predefined duplication function

MPI ERROR CLASSES

       MPI_SUCCESS
              - Successful return code
       MPI_ERR_BUFFER
              - Invalid buffer pointer
       MPI_ERR_COUNT
              - Invalid count argument
       MPI_ERR_TYPE
              - Invalid datatype argument
       MPI_ERR_TAG
              - Invalid tag argument
       MPI_ERR_COMM
              - Invalid communicator
       MPI_ERR_RANK
              - Invalid rank
       MPI_ERR_ROOT
              - Invalid root
       MPI_ERR_GROUP
              - Null group passed to function
       MPI_ERR_OP
              - Invalid operation
       MPI_ERR_TOPOLOGY
              - Invalid topology
       MPI_ERR_DIMS
              - Illegal dimension argument
       MPI_ERR_ARG
              - Invalid argument
       MPI_ERR_UNKNOWN
              - Unknown error
       MPI_ERR_TRUNCATE
              - Message truncated on receive
       MPI_ERR_OTHER
              - Other error; use Error_string
       MPI_ERR_INTERN
              - Internal error code
       MPI_ERR_IN_STATUS
              - Look in status for error value
       MPI_ERR_PENDING
              - Pending request
       MPI_ERR_REQUEST
              - Invalid mpi_request handle
       MPI_ERR_ACCESS
              - Permission denied
       MPI_ERR_AMODE
              - Error related to the amode passed to MPI_FILE_OPEN

       MPI_ERR_BAD_FILE
              - Invalid file name (e.g., path name too long)
       MPI_ERR_CONVERSION
              - An error occurred in a user supplied data conversion function
       MPI_ERR_DUP_DATAREP
              -  Conversion  functions  could  not  be  registered  because a data representation
              identifier that was already defined was passed to MPI_REGISTER_DATAREP

       MPI_ERR_FILE_EXISTS
              - File exists
       MPI_ERR_FILE_IN_USE
              - File operation could not be completed, as the file  is  currently  open  by  some
              process
       MPI_ERR_FILE
              - Invalid file handle
       MPI_ERR_IO
              - Other I/O error
       MPI_ERR_NO_SPACE
              - Not enough space
       MPI_ERR_NO_SUCH_FILE
              - File does not exist
       MPI_ERR_READ_ONLY
              - Read-only file or file system
       MPI_ERR_UNSUPPORTED_DATAREP
              - Unsupported datarep passed to MPI_FILE_SET_VIEW

       MPI_ERR_INFO
              - Invalid info argument
       MPI_ERR_INFO_KEY
              - Key longer than MPI_MAX_INFO_KEY
       MPI_ERR_INFO_VALUE
              - Value longer than MPI_MAX_INFO_VAL
       MPI_ERR_INFO_NOKEY
              - Invalid key passed to MPI_INFO_DELETE
       MPI_ERR_NAME
              - Invalid service name passed to MPI_LOOKUP_NAME
       MPI_ERR_NO_MEM
              - Alloc_mem could not allocate memory
       MPI_ERR_NOT_SAME
              - Collective argument not identical on all processes, or collective routines called
              in a different order by different processes
       MPI_ERR_PORT
              - Invalid port name passed to MPI_COMM_CONNECT
       MPI_ERR_QUOTA
              - Quota exceeded
       MPI_ERR_SERVICE
              - Invalid service name passed to MPI_UNPUBLISH_NAME
       MPI_ERR_SPAWN
              - Error in spawning processes
       MPI_ERR_UNSUPPORTED_OPERATION
              - Unsupported operation, such as seeking on a file which supports sequential access
              only
       MPI_ERR_WIN
              - Invalid win argument
       MPI_ERR_BASE
              - Invalid base passed to MPI_FREE_MEM
       MPI_ERR_LOCKTYPE
              - Invalid locktype argument
       MPI_ERR_KEYVAL
              - Erroneous attribute key
       MPI_ERR_RMA_CONFLICT
              - Conflicting accesses to window
       MPI_ERR_RMA_SYNC
              - Wrong synchronization of RMA calls
       MPI_ERR_SIZE
              - Invalid size argument
       MPI_ERR_DISP
              - Invalid disp argument
       MPI_ERR_ASSERT
              - Invalid assert argument
       MPI_ERR_RMA_RANGE
              -  Target  memory  is  not part of the window (in the case of a window created with
              MPI_WIN_CREATE_DYNAMIC, target memory is not attached)
       MPI_ERR_RMA_ATTACH
              - Memory cannot be attached (e.g., because of resource exhaustion)
       MPI_ERR_RMA_SHARED
              - Memory cannot be shared (e.g.,  some  process  in  the  group  of  the  specified
              communicator cannot expose shared memory)
       MPI_ERR_RMA_FLAVOR
              - Passed window has the wrong flavor for the called function
       MPI_ERR_LASTCODE
              - Last error code -- always at end

ERROR CODES FOR MPI_T

       MPI_T_ERR_MEMORY
              - Out of memory
       MPI_T_ERR_NOT_INITIALIZED
              - Interface not initialized
       MPI_T_ERR_CANNOT_INIT
              - Interface not in the state to be initialized
       MPI_T_ERR_INVALID_INDEX
              - The index is invalid or has been deleted
       MPI_T_ERR_INVALID_HANDLE
              - The handle is invalid
       MPI_T_ERR_OUT_OF_HANDLES
              - No more handles available
       MPI_T_ERR_OUT_OF_SESSIONS
              - No more sessions available
       MPI_T_ERR_INVALID_SESSION
              - Session argument is not valid
       MPI_T_ERR_CVAR_SET_NOT_NOW
              - Cvar cannot be set at this moment
       MPI_T_ERR_CVAR_SET_NEVER
              - Cvar cannot be set until end of execution
       MPI_T_ERR_PVAR_NO_STARTSTOP
              - Pvar can't be started or stopped
       MPI_T_ERR_PVAR_NO_WRITE
              - Pvar can't be written or reset
       MPI_T_ERR_PVAR_NO_ATOMIC
              - Pvar can't be R/W atomically
       MPI_T_ERR_INVALID_NAME
              - Name doesn't match
       MPI_T_ERR_INVALID
              - Invalid use of the interface or bad parameter values(s)

                                            2/21/2022                                Constants(3)