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- MARQUE LIVRES
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3
Developing Applications
This chapter discusses topics associated with developing ap plicatio ns in the HP XC environment.
Before reading this ch apter, you should you read and understand Chapter 1 and Chapter 2.
This chapter discusses the following topics:
• HP XC application development environment overview (Section 3.1)
• Using compilers (Section 3.2)
• Getting system information (Section 3.3 )
• Getting system information (Section 3.4 )
• Setting debugging options (Section 3.5)
• Developing serial applications (Section 3.6)
• Developing parallel applications (Section 3.7)
• Developing libraries (Section 3.8)
• Advanced topics (Section 3.9)
3.1 Overview
The HP XC cluster provides an application development environmen t that enables developing,
building, and run ning ap p li cations u s ing m ult ipl e nodes with multi ple processors. These
applications can be parallel applications using many processors, or serial applications using a
single processor.
The HP XC cluster is made up o f nodes that are assigned one or more various roles. Of
importance to the application developer are the nodes that h ave the compute role and the login
role (compute nodes and login nodes). Com pu te nodes run user ap plicatio ns. Login nodes are
where you log in and interact with the system to perform various tasks, such as executing
commands, compiling and linking applications, and launching app lication s. A login node
can also execute single-processor applications and com mands, just as on any other standard
Linux system. Applications are launched from log in nodes, and then distributed and run on
one or more compute nodes.
The HP XC environment uses the LSF batch job scheduler to launch and manage parallel and
serial applications. When a job is submitted, LSF places the job in a queue and allows it to run
when the necessary resources become available. When a job is completed, LSF returns job
output, job information, and any errors. In addition to batch jobs, LSF can also run interactive
batch jobs and interactive jobs. An LSF interactive batch job is a batch job that allows you to
interact with the application, yet still take advantage of LSF scheduling policies and features.
An LSF interactive job is run without using LSF’s batch processing features, b ut is dispatched
immediately by LSF on the LSF execution host node. LSF is described in detail in Chapter 7.
Regardless of whether an application is parallel or serial, or whether it is run interactively or as
a batch job, the general steps to d eveloping an HP XC application are as follows:
1. Build the code by compiling a n d linking with the correct compiler. Note that compiler
selection, and set up of appropriate parameters for specific compilers, is made easier
by the use of modules.
2. Launch the application with the bsub, srun,ormpirun command.
The build and launch commands are executed from the node to which you are logged in.
Developing Applications 3-1
- HP XC System Software 1
- Contents 3
- 3 Developing Applications 4
- 4 Debugging Applications 5
- 5 Tuning Applications 5
- 6UsingSLURM 5
- 8UsingHP-MPI 6
- 7 Using LSF 6
- 9UsingHPMLIB 7
- 10 Advanced Topics 8
- AExamples 8
- About This Document 11
- HP XC Inform ation 12
- For M ore Information 13
- Supplementary Information 13
- Manpages 14
- Related Information 15
- Typographical Conventions 16
- HP Encourages Your Comments 17
- 1.1 System Architecture 19
- 1.1.3 Storage and I/O 20
- 1.1.4 File System 20
- 1.2 User Environment 22
- 1.3.1 Parallel Applications 23
- 1.3.2 Serial Applications 23
- 1.4 Run-Time E nvironment 24
- 1.4.4 HP-MPI 25
- Using the System 27
- 2.2.1 Notes on Modulefiles 28
- 2.2.2 Supplied Modulefiles 29
- 2.2.6 Loading a Modulefile 30
- 2.2.7 Unloading a M odulefile 31
- 2.2.8 Modulefile Conflicts 31
- 2.2.9 Creating a Mod u lefile 32
- 2.3.1 Introduction 33
- 2.3.5 Launching Jobs 34
- $ man sinfo 39
- $ man -k keyword 39
- Using the System 2-13 39
- Developing Applications 41
- 3.2 Using Compilers 42
- 3.4 Interrupting a Job 43
- 3-4 Developing Applications 44
- Developing Applications 3-5 45
- 3-6 Developing Applications 46
- Developing Applications 3-7 47
- $ module load mpi 48
- $ mpicc -o mycode hello.c 48
- $ mpif90 -o mycode hello.f 48
- 3-8 Developing Applications 48
- 3.8 Developing Libraries 49
- 3.9 Advanced To pics 50
- 3-14 Deve loping Applications 54
- Developing Applications 3-15 55
- Debugging Applications 57
- 4-2 D ebugging Applications 58
- $ totalview 60
- 4-4 D ebugging Applications 60
- Debugging Applications 4-5 61
- 4-6 D ebugging Applications 62
- -verbosity %V %F" 63
- Debugging Applications 4-7 63
- 4-8 D ebugging Applications 64
- Etnus TotalView Version# 65
- Debugging Applications 4-9 65
- $ mpirun -srun -n2 Psimple 66
- 4-10 Debugging Applications 66
- $ squeue 67
- $ scancel --user username 67
- Debugging Applications 4-11 67
- Tuning Applications 69
- Using SLURM 71
- $ srun -N 16 -b myscript.sh 73
- $ srun -A -N 4 myscript.sh 73
- $ srun -a 6543 -j 73
- Using SLURM 6-3 73
- 6.4.2 srun Signal Handling 74
- 6.4.3 srun Run-Mode Options 74
- Using SLURM 6-5 75
- 6-6 Using SLURM 76
- 6.4.5 srun Control Options 77
- 6.4.6 srun I/O Options 78
- Using SLURM 6-9 79
- 6.4.7 srun Constraint Options 80
- Using SLURM 6-11 81
- 6.4.9 Using srun with HP-MPI 82
- 6.4.10 Using srun with LSF 82
- 6.8 Job Accounting 84
- 6.9 Fault Tolerance 84
- 6.10 Security 84
- Using LSF 85
- 7.1.2 Topology Support 86
- 7.1.3 Notes on LSF-HPC 87
- SLURM_JOBID=53 89
- SLURM_NPROCS=4 89
- 7-6 Using LSF 90
- 7.3.1 Getting Status of LSF 91
- $ bhosts 92
- 7-8 Using LSF 92
- 7.4 Submitting Jobs 93
- 7.4.3 Submitting a Serial Job 97
- Using LSF 7-17 101
- 7-18 Using LSF 102
- Using HP-MPI 111
- 8.3.3 Using srun with HP-MPI 114
- 8.3.4 Using LSF and HP-MPI 116
- 8.3.5 MPI Versioning 117
- 8.6 Truncated Messages 118
- 8.5 32-Bit B uilds on XC4000 118
- Using HP-MPI 8-9 119
- 8.9 Environment Variables 120
- 8.9.5 MPI_PIN_PERCENTAGE 121
- 8.9.6 MPI_PAGE_ALIGN_MEM 121
- 8.9.7 MPI_MAX_WINDOW 121
- 8.9.8 MPI_ELANLOCK 121
- 8.9.9 MPI_USE_LIBELAN 121
- 8.9.10 MPI_USE_LIBELAN_SUB 122
- Work-arounds 124
- Using HP MLIB 125
- 9.1.2 MLIB and Module Files 126
- 9.2.1 Platform Sup port 126
- 9.2.2 Library Support 126
- 9.2.3 MPI Parallelism 126
- 9.2.4 Modulefiles and MLIB 127
- 9.2.6 Compiling and Linking 127
- 9.2.7 Licensing 128
- 9.2.8 MLIB Man pages 128
- 9.3.1 Platform Sup port 128
- 9.3.2 Library Support 128
- 9.3.3 MPI Parallelism 129
- 9.3.4 Modulefiles and MLIB 129
- 9.3.5 Compiling and Linking 129
- 9.3.6 Licensing 130
- 9.3.7 MLIB Man pages 130
- Advanced Topics 131
- Examples 135
- $ lshosts 140
- Show the environment: 142
- Run the job: 142
- View the running job: 142
- View the finished job: 142
- Examples A-9 143
- Glossary 145
- Glossary-2 146
- Glossary-3 147
- Glossary-4 148
- Glossary-5 149
- Glossary-6 150
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