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Example: MPIX_Hardware(MPIX_Hardware_t *hw) typedef struct { unsigned prank; // Physical rank of node unsigned psize; // Size of partition unsigned ppn; // Processes per node unsigned coreID; // Process ID unsigned clockMHz; // Frequency in MHz unsigned memSize; // Memory in MB unsigned torus_dimension; // Actual torus dimension unsigned Size[MPIX_TORUS_MAX_DIMS]; // Max. torus dimensions unsigned Coords[MPIX_TORUS_MAX_DIMS]; // Node’s coordinated unsigned isTorus[MPIX_TORUS_MAX_DIMS]; // Wrap-around dims? unsigned rankInPset; unsigned sizeOfPset; unsigned idOfPset; } MPIX_Hardware_t; 70
Time (s) File I/O – Task-local Files Example: Creating files in parallel in the same directory 2000 parallel create of task-local files > 33 minutes 2004,6 1500 > 11 minutes 1000 > 3 minutes 676,5 500 1,7 3,2 4,0 5,5 18,2 76,2 182,3 0 1k 2k 4k 8k 16k 32k 64k 128k 256k Jugene, IBM Blue Gene/P, GPFS, filesystem /work using fopen() # of Files Caution: The creation of 256k files costs 142.500 core hours! Task-local files are not an option on Blue Gene! 71
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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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Page 19 and 20: 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: MPI Tuning - BG/Q Extensions Blue G
Page 73 and 74: SIONlib - An Alternative to Task-Lo
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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