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8 Cray T3E User’s Guide
1.2 Usage policy
As the Cray T3E is a high-performance computational resource, CSC
enforces a usage policy in order to guarantee an efficient and fair usage
of the computer.
When applying for access to the Cray T3E you are supposed to have a
user id also on some other computer at CSC. A T3E resource application
form can be requested by contacting Ms. Paula Mäki-Välkkilä at CSC, tel.
(09) 457 2718, e-mail [email protected].
The project application form is handled by the CSC T3E contact person
at CSC, who will contact the applicant if necessary. You are first granted
an initial quota of 100 hours, which gives you a possibility to test and
tune your code using 16 processors at maximum.
Within the limits of the initial quota, you have three months to demon-
strate that your code scales up. The results of the scaling tests should be
sent to CSC by the end of this time. Currently a typical requirement is to
attain at least a speedup of 1.5 when doubling the number of processors
allocated. The eventual quota and the maximum number of processors
for production runs will be granted by CSC’s Scientific Director when
the results of the scaling tests are available.
To get a production quota, you are requested to explain how you have
parallelized the program code. The aim of this procedure is to ensure
that you have understood the specific features of the T3E system and
that the code is parallelized efficiently.
The T3E system is intended only for parallel jobs. Single processor
production runs are not allowed. The computer can be used both for
interactive program development (testing and debugging) and for pro-
duction runs. However, there is a limit of 16 processors for interactive
use. If you want to use more processors, you have to use the batch job
facilities.
When running a batch job, a set of processors will be dedicated for your
job. If some of the processors become idle during the run, no other user
is allowed to use them until the whole run is finished.
Your quota will be charged according to the number of processors that
are assigned to the job multiplied by the elapsed wall clock time. For
example, if you run a job on 32 processors for three hours, 96 hours will
be deducted from your quota.
The usage policy and especially the configuration for batch jobs is likely
to change in time. Current configuration and batch job limits are given
in Chapter 8 (page 81).
- 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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