JUQUEEN - Prace Training Portal

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File I/O – Guidelines Use the correct file system ‒ $WORK has the best performance – use it! Pay attention to block alignment ‒ Best performance if the I/O is done in chunks with block size of the file system ‒ $WORK: 4 MB block size ‒ stat() or fstat() can be used to get block size Use parallel I/O (libraries) ‒ MPI I/O, ADIOS, HDF5, netCDF, SIONlib 72
SIONlib – An Alternative to Task-Local Files SIONlib (Scalable I/O library for parallel access to task-local files) ‒ Collective I/O to binary shared files ‒ Logical task-local view to data ‒ Collective open/close, independent write/read ‒ Support for MPI, OpenMP, MPI+OpenMP ‒ C, C++, and Fortran-wrapper ‒ Tools for manipulation of files available (extraction of data, splitting of files, dumping meta data, etc) 73
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JUQUEEN: Application Stack and Best
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Outline Supercomputing@JSC Jülich
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Jülich Supercomputing Centre (JSC)
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Integration of JSC in Networks and
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Supercomputer Systems@JSC: Dual Con
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User Support @ JSC - Overview Cross
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JUQUEEN - System Architecture IBM B
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Accounting Billing - Jobs charged f
Page 21 and 22: Module Environment Module concept -
Page 23 and 24: Module Environment Six module categ
Page 25 and 26: Module Environment $ module help ar
Page 27 and 28: JUQUEEN - Application Stack Mathema
Page 29 and 30: Running Simulations - Batch System
Page 31 and 32: LoadLeveler - Job Command File ASCI
Page 33 and 34: LoadLeveler - Blue Gene/Q Keywords
Page 35 and 36: Running Simulations - runjob Comman
Page 37 and 38: Running Simulations - MPI/OpenMP Co
Page 39 and 40: Monitoring of Jobs • LoadLeveler
Page 41 and 42: Outline Supercomputing@JSC Jülich
Page 43 and 44: Compilers for CN Language Compiler
Page 45 and 46: Basic Compiler Options - XL Compile
Page 47 and 48: MPI Message-Passing Interface - Bas
Page 49 and 50: Creating static Libraries Preferred
Page 53 and 54: Example: Compilers Diagnostics subr
Page 55 and 56: Quad floating Point eXtension unit
Page 57 and 58: IBM XL Compiler Support for QPX Usa
Page 59 and 60: IBM XL QPX Intrinsics • New intri
Page 61 and 62: Thread Level Speculation (TLS) •
Page 63 and 64: Thread Level Speculation Loop: save
Page 65 and 66: Transactional Memory • Enabling b
Page 67 and 68: Choosing Shape and Mapping • Shap
Page 69 and 70: MPI Tuning - BG/Q Extensions Blue G
Page 71: Time (s) File I/O - Task-local File
Page 75 and 76: SIONlib - An Alternative to Task-Lo
Page 77 and 78: Performance Analysis Goal: Detectio
Page 79 and 80: Scalasca Toolset for callpath and c
Page 83 and 84: Using Debuggers Prepare executable:
Page 85: Thank You! JSC user and application
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JUQUEEN - Prace Training Portal

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