Constants

Data types

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_TYPECLASS_REAL

REAL

MPI_TYPECLASS_INTEGER

INTEGER

MPI_TYPECLASS_COMPLEX

COMPLEX

MPI Darray and Subarray Values

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

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

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

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

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_BUFFER_AUTOMATIC

Use automatic (unlimited) buffering in buffered send

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

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

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_BIND_MPI_SESSION

MPI session 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

MPI_ERR_SESSION

Invalid session argument

MPI_ERR_PROC_ABORTED

Trying to communicate with aborted processes

MPI_ERR_VALUE_TOO_LARGE

Value is too large to store

MPI_ERR_ERRHANDLER

Invalid error handler argument 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)