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621. Operations that Move Data | PARALLEL.RU - Информационно-аналитический центр по
... Operations that Move Data . ... In this case, for the group containing the root process, all processes in the group must call the routine using a special argument for the root. ... Up: Operations that Move Data Next: Gather Previous: Operations that Move Data . ... IN root] rank of broadcast root (integer) . ... Data is broadcast from the root to all processes in group B. The receive buffer arguments of the processes in group B must be consistent with the send buffer argument of the root. ... Центры...
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Ссылки http://www.parallel.ru/docs/mpi2/node145.html -- 41.3 Кб -- 09.04.2016
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622. Intercommunicator Constructors | PARALLEL.RU - Информационно-аналитический
... Intercommunicator Constructors . ... In the following discussions, the two groups in an intercommunicator are called the left and right groups. ... MPI_Comm inter_comm, new_inter_comm; MPI_Group local_group, group; int rank = 0; /* rank on left side to include in new inter-comm */ . ... Split the intercommunicator for a single server per group of clients */ MPI_Comm_rank ( multiple_client_comm, &rank ); MPI_Comm_split ( multiple_client_comm, rank, 0, &single_server_comm ); . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node142.html -- 23.0 Кб -- 09.04.2016
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623. MPI_Allreduce | PARALLEL.RU - Информационно-аналитический центр по параллельным
... MPI_Allreduce . Combines values from all processes and distribute the result back to all processes #include "mpi.h" int MPI_Allreduce ( sendbuf, recvbuf, count, datatype, op, comm ) void *sendbuf; void *recvbuf; int count; MPI_Datatype datatype; MPI_Op op; MPI_Comm comm; . ... starting address of send buffer (choice) . count . ... The reduction functions ( MPI_Op ) do not return an error value. ... Note that MPI does not guarentee that an MPI program can continue past an error. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpich/html/www3/MPI_Allreduce.html -- 18.7 Кб -- 09.04.2016
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624. Assertions | PARALLEL.RU - Информационно-аналитический центр по параллельным
... Assertions . Up: Synchronization Calls Next: Miscellaneous Clarifications Previous: Lock . The assert argument in the calls MPI_WIN_POST, MPI_WIN_START, MPI_WIN_FENCE and MPI_WIN_LOCK is used to provide assertions on the context of the call that may be used to optimize performance. ... Advice to users. ... End of advice to users. ... MPI_MODE_NOCHECK --- the matching calls to MPI_WIN_POST have already completed on all target processes when the call to MPI_WIN_START is made. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node130.html -- 20.8 Кб -- 09.04.2016
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625. General Active Target Synchronization | PARALLEL.RU -
... General Active Target Synchronization . ... MPI_WIN_START(group, assert, win) . ... RMA accesses to each target window will be delayed, if necessary, until the target process executed the matching call to MPI_WIN_POST. ... The design for general active target synchronization requires the user to provide complete information on the communication pattern, at each end of a communication link: each origin specifies a list of targets, and each target specifies a list of origins. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node128.html -- 25.7 Кб -- 09.04.2016
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626. Fence | PARALLEL.RU - Информационно-аналитический центр по параллельным
... Fence . Up: Synchronization Calls Next: General Active Target Synchronization Previous: Synchronization Calls . MPI_WIN_FENCE(assert, win) . ... int MPI_Win_fence(int assert, MPI_Win win) . MPI_WIN_FENCE(ASSERT, WIN, IERROR) . ... The MPI call MPI_WIN_FENCE(assert, win) synchronizes RMA calls on win. ... However, a call to MPI_WIN_FENCE that is known not to end any epoch (in particular, a call with assert = MPI_MODE_NOPRECEDE) does not necessarily act as a barrier. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node127.html -- 18.3 Кб -- 09.04.2016
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627. Accumulate Functions | PARALLEL.RU - Информационно-аналитический центр по
... Accumulate Functions . ... MPI_ACCUMULATE(origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count, target_datatype, op, win) . IN origin_addr] initial address of buffer (choice) . ... Accumulate the contents of the origin buffer (as defined by origin_addr, origin_count and origin_datatype) to the buffer specified by arguments target_count and target_datatype, at offset target_disp, in the target window specified by target_rank and win, using the operation op. ...
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Ссылки http://www.parallel.ru/docs/mpi2/node125.html -- 20.8 Кб -- 09.04.2016
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628. Get | PARALLEL.RU - Информационно-аналитический центр по параллельным
... Get . ... MPI_GET(origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count, target_datatype, win) . OUT origin_addr] initial address of origin buffer (choice) . ... int MPI_Get(void *origin_addr, int origin_count, MPI_Datatype origin_datatype, int target_rank, MPI_Aint target_disp, int target_count, MPI_Datatype target_datatype, MPI_Win win) . MPI_GET(ORIGIN_ADDR, ORIGIN_COUNT, ORIGIN_DATATYPE, TARGET_RANK, TARGET_DISP, TARGET_COUNT, TARGET_DATATYPE, WIN, IERROR) . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node123.html -- 17.6 Кб -- 09.04.2016
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629. Put | PARALLEL.RU - Информационно-аналитический центр по параллельным
... Put . ... The execution of a put operation is similar to the execution of a send by the origin process and a matching receive by the target process. ... MPI_PUT(origin_addr, origin_count, origin_datatype, target_rank, target_disp, target_count, target_datatype, win) . IN origin_addr] initial address of origin buffer (choice) . ... MPI_PUT(ORIGIN_ADDR, ORIGIN_COUNT, ORIGIN_DATATYPE, TARGET_RANK, TARGET_DISP, TARGET_COUNT, TARGET_DATATYPE, WIN, IERROR) . type> ORIGIN_ADDR(*) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node122.html -- 21.0 Кб -- 09.04.2016
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630. Window Attributes | PARALLEL.RU - Информационно-аналитический центр по
... Window Attributes . ... MPI_WIN_BASE]window base address. MPI_WIN_SIZE] window size, in bytes. ... MPI_Win_get_attr(win, MPI_WIN_DISP_UNIT, &disp_unit, &flag) will return in base a pointer to the start of the window win, and will return in size and disp_unit pointers to the size and displacement unit of the window, respectively. ... The other ``window attribute,'' namely the group of processes attached to the window, can be retrieved using the call below. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node120.html -- 17.8 Кб -- 09.04.2016
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631. Window Creation | PARALLEL.RU - Информационно-аналитический центр по
... Window Creation . ... The initialization operation allows each process in an intracommunicator group to specify, in a collective operation, a ``window'' in its memory that is made accessible to accesses by remote processes. ... MPI_WIN_CREATE(base, size, disp_unit, info, comm, win) . ... int MPI_Win_create(void *base, MPI_Aint size, int disp_unit, MPI_Info info, MPI_Comm comm, MPI_Win *win) . MPI_WIN_CREATE(BASE, SIZE, DISP_UNIT, INFO, COMM, WIN, IERROR) . ... MPI_WIN_FREE(win) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node119.html -- 22.3 Кб -- 09.04.2016
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632. Another Way to Establish MPI Communication | PARALLEL.RU -
... Another Way to Establish MPI Communication . ... MPI_COMM_JOIN(fd, intercomm) . ... MPI_COMM_JOIN should normally succeed if the local and remote processes have access to the same implementation-defined MPI communication universe. ... The interaction of non- MPI communication with pending MPI communication is not defined. ... The returned communicator may be used to establish MPI communication with additional processes, through the usual MPI communicator creation mechanisms. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node115.html -- 20.4 Кб -- 09.04.2016
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633. Releasing Connections | PARALLEL.RU - Информационно-аналитический центр по
... Releasing Connections . ... After establishing a connection with MPI_COMM_CONNECT and MPI_COMM_ACCEPT, an error in one may affect the other. ... Two processes are connected if there is a communication path (direct or indirect) between them. ... Processes which are connected, but don't share the same MPI_COMM_WORLD may become disconnected (independent) if the communication path between them is broken by using MPI_COMM_DISCONNECT. ... int MPI_Comm_disconnect(MPI_Comm *comm) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node114.html -- 19.8 Кб -- 09.04.2016
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634. MPI_APPNUM | PARALLEL.RU - Информационно-аналитический центр по параллельным
... MPI_APPNUM . ... Additionally, if the process was not started by a spawn call, but by an implementation-specific startup mechanism that can handle multiple process specifications, MPI_APPNUM should be set to the number of the corresponding process specification. ... If an application was not spawned with MPI_COMM_SPAWN or MPI_COMM_SPAWN_MULTIPLE, and MPI_APPNUM doesn't make sense in the context of the implementation-specific startup mechanism, MPI_APPNUM is not set. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node113.html -- 17.7 Кб -- 09.04.2016
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635. Singleton MPI_INIT | PARALLEL.RU - Информационно-аналитический центр по
... Singleton MPI_INIT . ... A high-quality implementation will allow any process (including those not started with a ``parallel application'' mechanism) to become an MPI process by calling MPI_INIT. ... If a process enters MPI_INIT and determines that no special steps were taken (i.e., it has not been given the information to form an MPI_COMM_WORLD with other processes) it succeeds and forms a singleton MPI program, that is, one in which MPI_COMM_WORLD has size 1. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node112.html -- 17.8 Кб -- 09.04.2016
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636. Reserved Key Values | PARALLEL.RU - Информационно-аналитический центр по
... Reserved Key Values . ... The following key values are reserved. An implementation is not required to interpret these key values, but if it does interpret the key value, it must provide the functionality described. { ip_port} . ... Reserved for MPI_OPEN_PORT only). { ip_address} . ... If the address is not a valid IP address of the host on which the MPI_OPEN_PORT call is made, the results are undefined. Reserved for MPI_OPEN_PORT only). ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node105.html -- 16.4 Кб -- 09.04.2016
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637. Name Publishing | PARALLEL.RU - Информационно-аналитический центр по
... Name Publishing . ... A ( service_name, port_name) pair is published by the server, and may be retrieved by a client using the service_name only. ... MPI_PUBLISH_NAME(service_name, info, port_name) . ... int MPI_Publish_name(char *service_name, MPI_Info info, char *port_name) . MPI_PUBLISH_NAME(SERVICE_NAME, INFO, PORT_NAME, IERROR) . ... void MPI::Publish_name(const char* service_name, const MPI::Info& info, const char* port_name) . ... MPI_UNPUBLISH_NAME(service_name, info, port_name) . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node104.html -- 22.7 Кб -- 09.04.2016
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638. Client Routines | PARALLEL.RU - Информационно-аналитический центр по
... Client Routines . ... There is only one routine on the client side. MPI_COMM_CONNECT(port_name, info, root, comm, newcomm) . IN port_name] network address (string, used only on root) . ... int MPI_Comm_connect(char *port_name, MPI_Info info, int root, MPI_Comm comm, MPI_Comm *newcomm) . MPI_COMM_CONNECT(PORT_NAME, INFO, ROOT, COMM, NEWCOMM, IERROR) . ... MPI::Intercomm MPI::Intracomm::Connect(const char* port_name, const MPI::Info& info, int root) const . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node103.html -- 18.5 Кб -- 09.04.2016
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639. Server Routines | PARALLEL.RU - Информационно-аналитический центр по
... Server Routines . Up: Establishing Communication Next: Client Routines Previous: Names, Addresses, Ports, and All That . A server makes itself available with two routines. ... MPI_OPEN_PORT(info, port_name) . ... MPI_OPEN_PORT(INFO, PORT_NAME, IERROR) . ... This function establishes a network address, encoded in the port_name string, at which the server will be able to accept connections from clients. port_name is supplied by the system, possibly using information in the info argument. ...
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Ссылки http://www.parallel.ru/docs/mpi2/node102.html -- 20.5 Кб -- 09.04.2016
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640. Design | PARALLEL.RU - Информационно-аналитический центр по параллельным
... Design . Up: C++ Next: C++ Classes for MPI Previous: Overview . The C++ language interface for MPI is designed according to the following criteria: . ... The C++ language interface consists of a small set of classes with a lightweight functional interface to MPI. ... The MPI C++ language bindings provide a semantically correct interface to MPI. ... To the greatest extent possible, the C++ bindings for MPI functions are member functions of MPI classes. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi2/node225.html -- 17.0 Кб -- 09.04.2016
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