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Man Pages
Constants(3) MPI Constants(3)

Constants - Meaning of MPI's defined constants

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

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

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_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 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

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 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

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

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.

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

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 minumum
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

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.

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

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

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)

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

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

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

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

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

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

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.

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

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

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

MPI_INFO_ENV
- Contains the execution environment

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

MPI_ERRCODES_IGNORE
- Ignore an array of error codes

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 occurances 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

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

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_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_NULL_COPY_FN
- Predefined copy function
MPI_NULL_DELETE_FN
- Predefined delete function
MPI_DUP_FN
- Predefined duplication function

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

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_ITEM
- Item index queried is out of range
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 can't be set at this moment
MPI_T_ERR_CVAR_SET_NEVER
- Cvar can't 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)

12/16/2021

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