Cypress CSC-1200T Guía de usuario Pagina 62
- Pagina / 124
- Tabla de contenidos
- MARCADORES
Valorado. / 5. Basado en revisión del cliente
62 Cray T3E User’s Guide
Chapter 7
Interprocess communication
This chapter describes how to use the MPI or PVM message-passing li-
braries on the Cray T3E at CSC. In addition, the properties of the Cray
data-passing library SHMEM are described in some detail. The data-
parallel High Performance Fortran (HPF) programming model is intro-
duced, too.
7.1 The communication overhead
Parallelization on the T3E can be done by three different approaches:
message"-passing, data-passing and data-parallel programming. The
defining feature of message passing is that the data transfer from the
local memory of one process to the local memory of another requires op-
erations to be performed by both processes. In contrast, data-passing
routines for sending or receiving data are one-sided. In data-parallel
model, the programmer specifies only the data distribution between
processes, and the compiler generates a parallel executable code.
The fastest way to communicate between processors on the Cray T3E is
using the SHMEM library (Shared Memory Library). This is a Cray-specific
data-passing library and will not produce portable code to other archi-
tectures. It may be preferable to use MPI (Message Passing Interface),
a standardized and portable message-passing library. Another portable
message-passing library on the T3E is the somewhat older PVM (Parallel
Virtual Machine), which is, in general, a bit slower than MPI. The Cray T3E
system has also a data-parallel HPF (High Performance Fortran) compiler,
supporting Cray’s CRAFT data-parallel programming model, as well.
Message latency (or start-up time) is about 1 µs (microseconds) when
using the SHMEM library. With MPI the latency is about 30 µs. The
maximum bandwidth is in practice about 230 MB/s with both SHMEM
- Cray T3E 1
- User’s Guide 1
- Cray T3E User’s Guide 3 3
- Contents 4
- Contents 5 5
- B Glossary 113 6
- Bibliography 118 6
- Index 120 6
- Introduction 7
- 1.2 Usage policy 8
- 1.3 Overview of the system 9
- 1.4 Programming environment 9
- 10 Cray T3E User’s Guide 10
- Chapter 1. Introduction 11 11
- 12 Cray T3E User’s Guide 12
- Using the Cray T3E at CSC 13
- 2.2 Files 14
- 2.3 Editing files 16
- 2.5 Executing in batch mode 17
- 2.6 More information 18
- The Cray T3E system 20
- 3.2 Distributed memory 21
- 3.3 Processing elements 21
- 3.4 Processor architecture 23
- 3.5 Local memory hierarchy 24
- 26 Cray T3E User’s Guide 26
- Processing Element 27
- I/O Controller 27
- Interconnection 27
- Network 27
- 3.9 File systems 28
- 3.10 Resource monitoring 29
- 30 Cray T3E User’s Guide 30
- 3.11 More information 31
- Program development 32
- 4.3.1 BLAS 34
- 4.3.2 LAPACK 34
- 4.3.3 BLACS 35
- 4.3.4 PBLAS and ScaLAPACK 35
- 4.3.5 Details 35
- 36 Cray T3E User’s Guide 36
- 4.6 More information 38
- Fortran programming 40
- 5.2 Basic usage 41
- 5.4 Compiler options 42
- 5.5 Optimization options 42
- 5.6 Optimizing for cache 44
- 5.7 Compiler directives 45
- 5.8 Fortran 90 modules 48
- 5.9 Source code preprocessing 49
- 5.10 More information 51
- C and C++ programming 52
- 6.2 The C compiler 53
- 6.3 Calling Fortran from C 54
- 6.4 C compiler options 55
- #pragma _CRI symmetric var 59
- #pragma _CRI unroll [n] 59
- 6.6 The C++ compiler 61
- 6.7 More information 61
- Interprocess communication 62
- 7.2.1 Format of the MPI calls 63
- 7.2.2 Some MPI routines 64
- 7.2.3 An example of using MPI 64
- 7.2.5 MPI data types 67
- 7.3.1 Using PVM on the T3E 68
- #include <mpp/shmem.h> 71
- INCLUDE ’mpp/shmem.fh’ 71
- 7.4.2 Data addresses 72
- 7.4.4 Reduction routines 74
- 7.4.6 Example of using SHMEM 76
- 78 Cray T3E User’s Guide 78
- 0:c= 10121416 78
- 1:c= 2468 78
- 80 Cray T3E User’s Guide 80
- Batch queuing system 81
- 82 Cray T3E User’s Guide 82
- # QSUB -l p_mpp_t=7000 82
- 8.3 Status of the NQE job 83
- 84 Cray T3E User’s Guide 84
- 8.4 Deleting an NQE batch job 86
- 8.5 Queues 86
- 8.6 More information 87
- Programming tools 88
- 9.2 Program Browser 89
- 9.3 Debugging programs 92
- 9.3.2 Examining core files 93
- 94 Cray T3E User’s Guide 94
- 9.4.1 MPP Apprentice 95
- 9.4.2 The appview command 98
- 9.4.3 PAT 98
- 9.5.1 The VAMPIRtrace library 100
- 102
- 9.5.3 More information 103
- Miscellaneous notes 104
- 10.1.3 The CPU clock timer 105
- 10.1.4 Example of timing 106
- 108 Cray T3E User’s Guide 108
- 10.4 More information 110
- About CSC 111
- 112 Cray T3E User’s Guide 112
- Glossary 113
- 114 Cray T3E User’s Guide 114
- Appendix B. Glossary 115 115
- Metacomputer Environment 116
- Bibliography 118
Relacionado con productos y manuales para Receptor Cypress CSC-1200T
Receptor Cypress COH-Tx Manual de usuario
(12 paginas)
(12 paginas)
Receptor Cypress CWHDI-TX Especificaciones
(12 paginas)
(12 paginas)
Receptor Cypress CH-107 TX Manual de usuario
(16 paginas)
(16 paginas)
Receptor Cypress CH-506RX Especificaciones
(16 paginas)
(16 paginas)
Receptor Cypress COH-Tx Especificaciones
(16 paginas)
(16 paginas)
Receptor Cypress COH-Rx1 Especificaciones
(16 paginas)
(16 paginas)
Receptor Cypress CWHDI-RX Especificaciones
(12 paginas)
(12 paginas)
Receptor Cypress CSC-1200T Manual de usuario
(12 paginas)
(12 paginas)
Receptor Cypress CA-DVI100R Manual de usuario
(12 paginas)
(12 paginas)
Receptor Cypress CH-506RX Especificaciones
(24 paginas)
(24 paginas)
© 2020, manymanuals.es. Todos los derechos reservados | 0.057 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Comentarios a estos manuales