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421. Buffer allocation and usage | PARALLEL.RU - Информационно-аналитический центр
... Buffer allocation and usage . ... MPI_BUFFER_ATTACH( buffer, size) . ... int MPI_Buffer_attach( void* buffer, int size) . MPI_BUFFER_ATTACH( BUFFER, SIZE, IERROR) . ... Calls to attach and detach buffers. #define BUFFSIZE 10000 int size char *buff; MPI_Buffer_attach( malloc(BUFFSIZE), BUFFSIZE); /* a buffer of 10000 bytes can now be used by MPI_Bsend */ MPI_Buffer_detach( &buff, &size); /* Buffer size reduced to zero */ MPI_Buffer_attach( buff, size); /* Buffer of 10000 bytes available again */ . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node42.html -- 20.4 Кб -- 09.04.2016
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422. Probe and Cancel | PARALLEL.RU - Информационно-аналитический центр по
... Probe and Cancel . ... The call matches the same message that would have been received by a call to MPI_RECV(..., source, tag, comm, status) executed at the same point in the program, and returns in status the same value that would have been returned by MPI_RECV(). ... A call to MPI_PROBE(source, tag, comm, status) will match the message that would have been received by a call to MPI_RECV(..., source, tag, comm, status) executed at the same point. ... The cancel call is local. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node50.html -- 27.4 Кб -- 09.04.2016
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423. Semantics of point-to-point communication | PARALLEL.RU -
... Semantics of point-to-point communication . Up: Point-to-Point Communication Next: Buffer allocation and usage Previous: Communication Modes . ... Some of the calls described later, such as MPI_CANCEL or MPI_WAITANY, are additional sources of nondeterminism.) ... If buffered sends are used, then a buffer overflow will result. ... Many programmers prefer to have more leeway and be able to use the ``unsafe'' programming style shown in example Semantics of point-to-point communication . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node41.html -- 27.1 Кб -- 09.04.2016
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424. Multiple Completions | PARALLEL.RU - Информационно-аналитический центр по
... Multiple Completions . ... MPI_WAITANY (count, array_of_requests, index, status) . ... int MPI_Waitany(int count, MPI_Request *array_of_requests, int *index, MPI_Status *status) . ... INTEGER COUNT, ARRAY_OF_REQUESTS(*), INDEX, STATUS(MPI_STATUS_SIZE), IERROR . ... The execution of MPI_WAITANY(count, array_of_requests, index, status) has the same effect as the execution of MPI_WAIT(&array_of_requests[i], status), where i is the value returned by index (unless the value of index is MPI_UNDEFINED)...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node49.html -- 31.8 Кб -- 09.04.2016
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425. Persistent communication requests | PARALLEL.RU - Информационно-аналитический
... Persistent communication requests . ... In such a situation, it may be possible to optimize the communication by binding the list of communication arguments to a persistent communication request once and, then, repeatedly using the request to initiate and complete messages. The persistent request thus created can be thought of as a communication port or a ``half-channel.' ... MPI_SEND_INIT(buf, count, datatype, dest, tag, comm, request) . ... OUT request] communication request (handle) . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node51.html -- 25.4 Кб -- 09.04.2016
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426. Data type matching and data conversion | PARALLEL.RU -
. Перейти к основному содержанию . Главная . ? Документы . ? Data type matching and data conversion . Up: Point-to-Point Communication Next: Type matching rules Previous: Return status . Up: Point-to-Point Communication Next: Type matching rules Previous: Return status . Return to MPI Standard Index . Return to MPI home page . О Сервере . Что нового? . Компьютеры . Технологии . Исследования . Метакомпьютинг . Информация . Конференции . Центры . История . Россия . Новости . Общение . Наш сервис . Поиск .
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Ссылки http://www.parallel.ru/docs/mpi1.1/node36.html -- 15.9 Кб -- 09.04.2016
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427. Communication Modes | PARALLEL.RU - Информационно-аналитический центр по
... Communication Modes . ... The send call described in Section Blocking send is blocking : it does not return until the message data and envelope have been safely stored away so that the sender is free to access and overwrite the send buffer. The message might be copied directly into the matching receive buffer, or it might be copied into a temporary system buffer. ... A buffered mode send operation can be started whether or not a matching receive has been posted. ... Send in buffered mode. ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node40.html -- 26.7 Кб -- 09.04.2016
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428. Blocking receive | PARALLEL.RU - Информационно-аналитический центр по
... Blocking receive . Up: Blocking Send and Receive Operations Next: Return status Previous: Message envelope . ... MPI_RECV (buf, count, datatype, source, tag, comm, status) . ... A message can be received by a receive operation if its envelope matches the source, tag and comm values specified by the receive operation. The receiver may specify a wildcard MPI_ANY_SOURCE value for source, and/or a wildcard MPI_ANY_TAG value for tag, indicating that any source and/or tag are acceptable. ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node34.html -- 20.8 Кб -- 09.04.2016
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429. User-Defined Operations | PARALLEL.RU - Информационно-аналитический центр по
... User-Defined Operations . ... If commute = true then the order of evaluation can be changed, taking advantage of commutativity and associativity. function is the user-defined function, which must have the following four arguments: invec, inoutvec, len and datatype. The ANSI-C prototype for the function is the following. typedef void MPI_User_function( void *invec, void *inoutvec, int *len, MPI_Datatype *datatype); The Fortran declaration of the user-defined function appears below. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node80.html -- 25.5 Кб -- 09.04.2016
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430. MINLOC and MAXLOC | PARALLEL.RU - Информационно-аналитический центр по
... MINLOC and MAXLOC . ... One application of these is to compute a global minimum (maximum) and the rank of the process containing this value. ... In C, the MPI-provided pair type has distinct types and the index is an int. In order to use MPI_MINLOC and MPI_MAXLOC in a reduce operation, one must provide a datatype argument that represents a pair (value and index). ... The operations MPI_MAXLOC and MPI_MINLOC can be used with each of the following datatypes. ... MPI_LONG_INT] long and int . ... Центры...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node79.html -- 22.9 Кб -- 09.04.2016
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431. Predefined reduce operations | PARALLEL.RU - Информационно-аналитический центр
... Predefined reduce operations . Up: Global Reduction Operations Next: MINLOC and MAXLOC Previous: Reduce . The following predefined operations are supplied for MPI_REDUCE and related functions MPI_ALLREDUCE, MPI_REDUCE_SCATTER, and MPI_SCAN. ... MPI_SUM] sum . ... C integer:] MPI_INT, MPI_LONG, MPI_SHORT, . ... MPI_SUM, MPI_PROD] C integer, Fortran integer, Floating point, Complex . ... global sum CALL MPI_REDUCE(sum, c, 1, MPI_REAL, MPI_SUM, 0, comm, ierr) RETURN . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node78.html -- 18.9 Кб -- 09.04.2016
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432. Correct use of addresses | PARALLEL.RU - Информационно-аналитический центр по
... Correct use of addresses . ... Thus, the use of addresses , that is, displacements relative to the start address MPI_BOTTOM, has to be restricted. Variables belong to the same sequential storage if they belong to the same array, to the same COMMON block in Fortran, or to the same structure in C. Valid addresses are defined recursively as follows: . ... A correct program uses only valid addresses to identify the locations of entries in communication buffers. ... Advice to users. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node60.html -- 19.2 Кб -- 09.04.2016
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433. Commit and free | PARALLEL.RU - Информационно-аналитический центр по
... Commit and free . Up: Derived datatypes Next: Use of general datatypes in communication Previous: Lower-bound and upper-bound markers . A datatype object has to be committed before it can be used in a communication. ... The commit operation commits the datatype, that is, the formal description of a communication buffer, not the content of that buffer. ... now type1 can be used anew for communication Freeing a datatype does not affect any other datatype that was built from the freed datatype. ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node58.html -- 19.1 Кб -- 09.04.2016
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434. Type matching rules | PARALLEL.RU - Информационно-аналитический центр по
... Type matching rules . Up: Data type matching and data conversion Next: Type MPI_CHARACTER Previous: Data type matching and data conversion . ... Message data . ... Communication of typed values (e.g., with datatype different from MPI_BYTE), where the datatypes of the corresponding entries in the sender program, in the send call, in the receive call and in the receiver program must all match. ... Up: Type matching rules Next: Data conversion Previous: Type matching rules . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node37.html -- 24.8 Кб -- 09.04.2016
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435. Return status | PARALLEL.RU - Информационно-аналитический центр по параллельным
... Return status . ... However, this information is not directly available as a field of the status variable and a call to MPI_GET_COUNT is required to ``decode'' this information. MPI_GET_COUNT(status, datatype, count) . ... int MPI_Get_count(MPI_Status *status, MPI_Datatype datatype, int *count) . ... All send and receive operations use the buf, count, datatype, source, dest, tag, comm and status arguments in the same way as the blocking MPI_SEND and MPI_RECV operations described in this section. ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node35.html -- 20.2 Кб -- 09.04.2016
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436. Examples | PARALLEL.RU - Информационно-аналитический центр по параллельным
... Examples . ... REAL a(100,100,100), e(9,9,9) INTEGER oneslice, twoslice, threeslice, sizeofreal, myrank, ierr INTEGER status(MPI_STATUS_SIZE) . ... CALL MPI_COMM_RANK(MPI_COMM_WORLD, myrank) . CALL MPI_TYPE_EXTENT( MPI_REAL, sizeofreal, ierr) . ... REAL a(100,100), b(100,100) INTEGER disp(100), blocklen(100), ltype, myrank, ierr INTEGER status(MPI_STATUS_SIZE) . ... C create datatype for lower triangular part CALL MPI_TYPE_INDEXED( 100, block, disp, MPI_REAL, ltype, ierr) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node61.html -- 26.6 Кб -- 09.04.2016
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437. Address and extent functions | PARALLEL.RU - Информационно-аналитический центр
... Address and extent functions . Up: Derived datatypes Next: Lower-bound and upper-bound markers Previous: Datatype constructors . The displacements in a general datatype are relative to some initial buffer address. ... Thus, a datatype can specify the absolute address of the entries in the communication buffer, in which case the buf argument is passed the value MPI_BOTTOM. The address of a location in memory can be found by invoking the function . MPI_ADDRESS. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node56.html -- 19.2 Кб -- 09.04.2016
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438. Data conversion | PARALLEL.RU - Информационно-аналитический центр по
... Data conversion . Up: Data type matching and data conversion Next: Communication Modes Previous: Type MPI_CHARACTER . ... On the other hand, MPI requires that a representation conversion be performed when a typed value is transferred across environments that use different representations for the datatype of this value. ... Note that representation conversion may occur when values of type MPI_CHARACTER or MPI_CHAR are transferred, for example, from an EBCDIC encoding to an ASCII encoding.) ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node39.html -- 21.2 Кб -- 09.04.2016
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439. Message envelope | PARALLEL.RU - Информационно-аналитический центр по
... Message envelope . ... This information consists of a fixed number of fields, which we collectively call the message envelope . ... communicator The message source is implicitly determined by the identity of the message sender. ... The message destination is specified by the dest argument. ... A communicator specifies the communication context for a communication operation. ... The communicator also specifies the set of processes that share this communication context. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node33.html -- 19.4 Кб -- 09.04.2016
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440. Blocking send | PARALLEL.RU - Информационно-аналитический центр по параллельным
... Blocking send . Up: Blocking Send and Receive Operations Next: Message data Previous: Blocking Send and Receive Operations . The syntax of the blocking send operation is given below. MPI_SEND(buf, count, datatype, dest, tag, comm) . ... IN datatype] datatype of each send buffer element (handle) . ... int MPI_Send(void* buf, int count, MPI_Datatype datatype, int dest, int tag, MPI_Comm comm) . MPI_SEND(BUF, COUNT, DATATYPE, DEST, TAG, COMM, IERROR) . type> BUF(*) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node31.html -- 16.8 Кб -- 09.04.2016
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