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66 Cray T3E User’s Guide
CALL MPI_COMM_RANK(MPI_COMM_WORLD, id, rc)
data = id
CALL MPI_REDUCE(data, s, 1, MPI_INTEGER, &
MPI_SUM, 0, MPI_COMM_WORLD, rc)
CALL MPI_BCAST(s, 1, MPI_INTEGER, 0, MPI_COMM_WORLD, rc)
WRITE(*,*) ’data:’, data, ’sum:’, s
CALL MPI_FINALIZE(rc)
END PROGRAM example
If this program is in the file collect.f90, it can be compiled and run
interactively as follows:
t3e% f90 -o collect.x collect.f90
t3e% mpprun -n 8 ./collect.x
data: 0 sum: 28
data: 4 sum: 28
data: 1 sum: 28
data: 5 sum: 28
data: 3 sum: 28
data: 7 sum: 28
data: 6 sum: 28
data: 2 sum: 28
t3e% mpprun -n 3 ./collect.x
data: 0 sum: 3
data: 1 sum: 3
data: 2 sum: 3
The program was first run on eight processors, and thereafter on three
processors. Chapter 8 discusses running batch jobs.
Here is a C language version of the same program:
#include <stdio.h>
#include <mpi.h>
main(int argc, char *argv[])
{
int ntasks, id, rc, data, s;
rc = MPI_Init(&argc, &argv);
if (rc != MPI_SUCCESS) {
printf("MPI initialization failed\n");
exit(1);
}
rc = MPI_Comm_size(MPI_COMM_WORLD, &ntasks);
rc = MPI_Comm_rank(MPI_COMM_WORLD, &id);
data = id;
rc = MPI_Reduce(&data, &s, 1, MPI_INT, MPI_SUM, 0,
MPI_COMM_WORLD);
rc = MPI_Bcast(&s, 1, MPI_INT, 0, MPI_COMM_WORLD);
printf("data: %d sum: %d\n", data, s);
rc = MPI_Finalize();
exit(0);
}
If the program is in the file collect.c, it can be compiled as follows:
- 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
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