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361. Examples | PARALLEL.RU - Информационно-аналитический центр по параллельным
. Перейти к основному содержанию . Главная . ? Документы . ? Examples . Up: Profiling Interface Next: Profiler implementation Previous: Miscellaneous control of profiling . Up: Profiling Interface Next: Profiler implementation Previous: Miscellaneous control of profiling . 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/node157.html -- 15.9 Кб -- 09.04.2016
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362. Logic of the design | PARALLEL.RU - Информационно-аналитический центр по
... Logic of the design . Up: Profiling Interface Next: Miscellaneous control of profiling Previous: Discussion . Provided that an MPI implementation meets the requirements above, it is possible for the implementor of the profiling system to intercept all of the MPI calls which are made by the user program. She can then collect whatever information she requires before calling the underlying MPI implementation (through its name shifted entry points) to achieve the desired effects. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node155.html -- 16.3 Кб -- 09.04.2016
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363. Communicator Management | PARALLEL.RU - Информационно-аналитический центр по
... Communicator Management . Up: Groups, Contexts, and Communicators Next: Communicator Accessors Previous: Group Destructors . ... Operations that access communicators are local and their execution does not require interprocess communication. ... High-quality implementations should amortize the overheads associated with the creation of communicators (for the same group, or subsets thereof) over several calls, by allocating multiple contexts with one collective communication. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node100.html -- 16.5 Кб -- 09.04.2016
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364. C bindings for Point-to-Point Communication | PARALLEL.RU -
... C bindings for Point-to-Point Communication . Up: Language Binding Next: C Bindings for Collective Communication Previous: Defined Constants for C and Fortran . These are presented here in the order of their appearance in the chapter. int MPI_Send(void* buf, int count, MPI_Datatype datatype, int dest, int tag, MPI_Comm comm) . int MPI_Recv(void* buf, int count, MPI_Datatype datatype, int source, int tag, MPI_Comm comm, MPI_Status *status) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node170.html -- 21.8 Кб -- 09.04.2016
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365. Startup | PARALLEL.RU - Информационно-аналитический центр по параллельным
... Startup . ... However, an implementation may require some setup to be performed before other MPI routines may be called. To provide for this, MPI includes an initialization routine MPI_INIT. ... All MPI programs must contain a call to MPI_INIT; this routine must be called before any other MPI routine (apart from MPI_INITIALIZED ) is called. ... Once this routine is called, no MPI routine (even MPI_INIT) may be called. ... It is the only routine that may be called before MPI_INIT is called. ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node151.html -- 20.1 Кб -- 09.04.2016
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366. Timers and synchronization | PARALLEL.RU - Информационно-аналитический центр по
... Timers and synchronization . ... MPI defines a timer. ... MPI_WTIME() . double MPI_Wtime(void) . DOUBLE PRECISION MPI_WTIME() . MPI_WTIME returns a floating-point number of seconds, representing elapsed wall-clock time since some time in the past. ... double starttime, endtime; starttime = MPI_Wtime(); .... stuff to be timed ... endtime = MPI_Wtime(); printf("That took %f seconds\n",endtime-starttime); } . ... MPI_WTICK returns the resolution of MPI_WTIME in seconds. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node150.html -- 17.8 Кб -- 09.04.2016
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367. Error codes and classes | PARALLEL.RU - Информационно-аналитический центр по
... Error codes and classes . ... To make it possible for an application to interpret an error code, the routine MPI_ERROR_CLASS converts any error code into one of a small set of standard error codes, called error classes . ... The error classes are a subset of the error codes: an MPI function may return an error class number; and the function MPI_ERROR_STRING can be used to compute the error string associated with an error class. ... MPI_ERROR_CLASS( errorcode, errorclass ) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node149.html -- 17.8 Кб -- 09.04.2016
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368. Low-level topology functions | PARALLEL.RU - Информационно-аналитический центр
... Low-level topology functions . ... MPI_CART_MAP(comm, ndims, dims, periods, newrank) . ... The function MPI_CART_CREATE(comm, ndims, dims, periods, reorder, comm_cart), with reorder = true can be implemented by calling MPI_CART_MAP(comm, ndims, dims, periods, newrank), then calling . ... The function MPI_GRAPH_CREATE(comm, nnodes, index, edges, reorder, comm_graph), with reorder = true can be implemented by calling MPI_GRAPH_MAP(comm, nnodes, index, edges, newrank), then calling . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node139.html -- 19.9 Кб -- 09.04.2016
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369. Partitioning of Cartesian structures | PARALLEL.RU -
... Partitioning of Cartesian structures . ... MPI_CART_SUB(comm, remain_dims, newcomm) . IN comm] communicator with cartesian structure (handle) . ... int MPI_Cart_sub(MPI_Comm comm, int *remain_dims, MPI_Comm *newcomm) . ... MPI_CART_SUB can be used to partition the communicator group into subgroups that form lower-dimensional cartesian subgrids, and to build for each subgroup a communicator with the associated subgrid cartesian topology. ... MPI_CART_SUB(comm, remain_dims, comm_new) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node138.html -- 17.7 Кб -- 09.04.2016
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370. Cartesian Shift Coordinates | PARALLEL.RU - Информационно-аналитический центр
... Cartesian Shift Coordinates . ... If the process topology is a cartesian structure, a MPI_SENDRECV operation is likely to be used along a coordinate direction to perform a shift of data. ... MPI_CART_SHIFT(comm, direction, disp, rank_source, rank_dest) . ... IN direction] coordinate dimension of shift (integer) . ... Depending on the periodicity of the cartesian group in the specified coordinate direction, MPI_CART_SHIFT provides the identifiers for a circular or an end-off shift. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node137.html -- 19.0 Кб -- 09.04.2016
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371. Topology inquiry functions | PARALLEL.RU - Информационно-аналитический центр по
... Topology inquiry functions . ... If a topology has been defined with one of the above functions, then the topology information can be looked up using inquiry functions. ... MPI_TOPO_TEST(comm, status) . ... OUT status] topology type of communicator comm (choice) . int MPI_Topo_test(MPI_Comm comm, int *status) . ... The function MPI_TOPO_TEST returns the type of topology that is assigned to a communicator. ... int MPI_Graphdims_get(MPI_Comm comm, int *nnodes, int *nedges) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node136.html -- 24.8 Кб -- 09.04.2016
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372. General (Graph) Constructor | PARALLEL.RU - Информационно-аналитический центр
... General (Graph) Constructor . ... MPI_GRAPH_CREATE(comm_old, nnodes, index, edges, reorder, comm_graph) . ... int MPI_Graph_create(MPI_Comm comm_old, int nnodes, int *index, int *edges, int reorder, MPI_Comm *comm_graph) . MPI_GRAPH_CREATE(COMM_OLD, NNODES, INDEX, EDGES, REORDER, COMM_GRAPH, IERROR) . INTEGER COMM_OLD, NNODES, INDEX(*), EDGES(*), COMM_GRAPH, IERROR . ... The three parameters nnodes, index and edges define the graph structure. nnodes is the number of nodes of the graph. ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node135.html -- 20.4 Кб -- 09.04.2016
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373. Cartesian Convenience Function: MPI_DIMS_CREATE | PARALLEL.RU -
... Cartesian Convenience Function: MPI_DIMS_CREATE . ... For cartesian topologies, the function MPI_DIMS_CREATE helps the user select a balanced distribution of processes per coordinate direction, depending on the number of processes in the group to be balanced and optional constraints that can be specified by the user. ... MPI_DIMS_CREATE(nnodes, ndims, dims) . ... int MPI_Dims_create(int nnodes, int ndims, int *dims) . MPI_DIMS_CREATE(NNODES, NDIMS, DIMS, IERROR) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node134.html -- 18.0 Кб -- 09.04.2016
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374. Cartesian Constructor | PARALLEL.RU - Информационно-аналитический центр по
... Cartesian Constructor . Up: Topology Constructors Next: Cartesian Convenience Function: MPI_DIMS_CREATE Previous: Topology Constructors . MPI_CART_CREATE(comm_old, ndims, dims, periods, reorder, comm_cart) . ... IN ndims] number of dimensions of cartesian grid (integer) . ... OUT comm_cart] communicator with new cartesian topology (handle) . int MPI_Cart_create(MPI_Comm comm_old, int ndims, int *dims, int *periods, int reorder, MPI_Comm *comm_cart) . ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node133.html -- 17.5 Кб -- 09.04.2016
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375. Functionality | PARALLEL.RU - Информационно-аналитический центр по параллельным
... Such attribute can be a handle to an MPI object, or just an integer-valued attribute. ... obtain a key value (used to identify an attribute); the user specifies ``callback'' functions by which MPI informs the application when the communicator is destroyed or copied. store and retrieve the value of an attribute; . ... The call is erroneous if there is no key with value keyval; in particular MPI_KEYVAL_INVALID is an erroneous key value. ... IN keyval] The key value of the deleted attribute (integer) ....
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Ссылки http://www.parallel.ru/docs/mpi1.1/node119.html -- 28.3 Кб -- 09.04.2016
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376. Inter-communicator Operations | PARALLEL.RU - Информационно-аналитический центр
... Inter-communicator Operations . ... MPI_INTERCOMM_CREATE is used to bind two intra-communicators into an inter-communicator; the function MPI_INTERCOMM_MERGE creates an intra-communicator by merging the local and remote groups of an inter-communicator. ... MPI_INTERCOMM_MERGE(intercomm, high, newintracomm) . ... If processes in one group provided the value high = false and processes in the other group provided the value high = true then the union orders the ``low'' group before the ``high'' group. ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node113.html -- 22.0 Кб -- 09.04.2016
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377. Inter-communicator Accessors | PARALLEL.RU - Информационно-аналитический центр
... Inter-communicator Accessors . ... MPI_COMM_TEST_INTER(comm, flag) . ... MPI_COMM_TEST_INTER(COMM, FLAG, IERROR) . INTEGER COMM, IERROR . ... The following accessors provide consistent access to the remote group of an inter-communicator: . ... MPI_COMM_REMOTE_GROUP(COMM, GROUP, IERROR) . INTEGER COMM, GROUP, IERROR . ... Symmetric access to both the local and remote groups of an inter-communicator is important, so this function, as well as MPI_COMM_REMOTE_SIZE have been provided. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node112.html -- 18.3 Кб -- 09.04.2016
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378. Communicator Destructors | PARALLEL.RU - Информационно-аналитический центр по
... Communicator Destructors . Up: Communicator Management Next: Motivating Examples Previous: Communicator Constructors . MPI_COMM_FREE(comm) . INOUT comm] communicator to be destroyed (handle) . int MPI_Comm_free(MPI_Comm *comm) . MPI_COMM_FREE(COMM, IERROR) . ... This call applies to intra- and inter-communicators. ... A reference-count mechanism may be used: the reference count is incremented by each call to MPI_COMM_DUP, and decremented by each call to MPI_COMM_FREE. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node103.html -- 17.2 Кб -- 09.04.2016
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379. Communicator Constructors | PARALLEL.RU - Информационно-аналитический центр по
... Communicator Constructors . ... The following are collective functions that are invoked by all processes in the group associated with comm. ... MPI_COMM_CREATE provides a means to subset a group of processes for the purpose of separate MIMD computation, with separate communication space. newcomm, which emerges from MPI_COMM_CREATE can be used in subsequent calls to MPI_COMM_CREATE (or other communicator constructors) further to subdivide a computation into parallel sub-computations. ... Центры . ...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node102.html -- 24.6 Кб -- 09.04.2016
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380. Communicator Accessors | PARALLEL.RU - Информационно-аналитический центр по
... Communicator Accessors . ... OUT size] number of processes in the group of comm (integer) . ... This function is equivalent to accessing the communicator's group with MPI_COMM_GROUP (see above), computing the size using MPI_GROUP_SIZE, and then freeing the temporary group via MPI_GROUP_FREE. ... This function is equivalent to accessing the communicator's group with MPI_COMM_GROUP (see above), computing the rank using MPI_GROUP_RANK, and then freeing the temporary group via MPI_GROUP_FREE. ... Центры...
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Ссылки http://www.parallel.ru/docs/mpi1.1/node101.html -- 19.6 Кб -- 09.04.2016
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