Hp XC System 2.x Software Manuel d'utilisateur Page 76
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- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
Each partition’s node limits sup ersede those specified by -N. Jobs that request more nodes than
the partition allows n ever leave the PENDING state. To use a specific partition, use the srun
-p option. Com binations of -n and -N control how job processes are distrib uted among nodes
according to the following srun policies:
-n/-N com binations srun infers your intended number of processes per nod e if you
specify both the number of processes and the number of nodes
for your job. Thus -n16 -N8 normally results in running 2
processes/node. But, see t he next policy for exceptions.
Minimum interpretation srun interprets all n ode requests as m inimu m node req uests (-N16
means "at least 16 nodes"). If some nodes lack enough CPUs to
cover the process count specified by -n, srun will automatically
allocate more nodes (than mentioned with -N) to meet the need. For
example, if not all nodes have 2 w orking CPUs, then -n32 -N16
together will allocate more than 16 nodes so that all processes are
supported. The actual number of nodes assigned (not the num ber
requested) is stored in environment variable SLURM_NNODES.
CPU overcommitment By default, srun never allocates more than one process per CPU. If
you intend to assign multiple processes per CPU, you must invoke
the srun -O option along with -n and -N.Thus,-n16 -N4 -O
together allow 2 processes per CPU on the 4 allocated 2-CPU nodes.
Inconsistent allocation
srun rejects as e rrors inconsistent -n/-N combinations. For
example, -n15 -N16 requests the impossible assignment of 15
processes to 16 nodes.
-c cpt (--cpus-per-task=cpt)
The -c cpt option assigns cpt CPUs p er process for this job ( defau lt is one CPU per process).
This o ption supports m ultith readed programs that requ ire more than a single CPU per process
for best performance.
For mu lti thr eaded programs where the density of CPUs is m ore important than a specific node
count, use both -n and -c on the srun execute line rather than -N. The options -n16 and
-c2 result in whatever node allocation is needed to yield the requested 2 CPUs/process. This is
the r everse of CPU overcommitm ent (see -N and -O options).
-p part (--partition=part)
The -p part option requests nodes only from the part partition. The default partition is
assigned by the system administrator.
-t minutes (--time=minutes)
The -t minutes option a llocates a total number o f minutes for this job to run (default is the
current partition’s time limit). If the number of minutes exceeds the partition’s time limit, then
the job never leaves the PENDING state. When the tim e limit has been reached, SLUR M
sends each job process SIGTERM followed (after a pause specified by SLURM’s KillWait
configuration parameter) by SIGKILL.
-T nthreads ( --threads=nthreads)
The -T nthreads option requests that srun allocate nthreads threads to initiate and
control the parallel tasks in this job. The default is the smaller of either 10 or th e number of
nodes actually allocated, SLURM_NNODES.
6-6 Using SLURM
- 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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