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Tuning Runtime Environment • Network – Topology on BG/Q: 5D Torus A×B×C×D×E(×T) • Shape – Extension of a partition in A, B, C, and D direction in terms of midplanes • Mapping – Assignment of processes to nodes and cores – Best performance for nearest-neighbor communication – Processes should be mapped accordingly • Optimal mapping depends on application / communication pattern • Might be performance critical for jobs sizes > 1 midplane 66
Choosing Shape and Mapping • Shape #@bg_shape = #<strong>JUQUEEN</strong>: 2x2x2x2 maximum #@bg_rotate = False|True • Mapping 1. Specified as a permutation of ABCDET (rightmost fastest) 2. Specified via a map file 1. runjob --mapping ACBDET 2. Runjob --mapping – Default mapping: ABCDET – Good for 1D communication patterns (communication with task ± 1) 67
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JUQUEEN: Application Stack and Best
Page 3 and 4:
Outline Supercomputing@JSC Jülich
Page 5 and 6:
Jülich Supercomputing Centre (JSC)
Page 7 and 8:
Integration of JSC in Networks and
Page 9 and 10:
Supercomputer Systems@JSC: Dual Con
Page 11 and 12:
User Support @ JSC - Overview Cross
Page 13 and 14:
Outline Supercomputing@JSC Jülich
Page 15 and 16: JUQUEEN - System Architecture IBM B
Page 17 and 18: Outline Supercomputing@JSC Jülich
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 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: Transactional Memory • Enabling b
Page 69 and 70: MPI Tuning - BG/Q Extensions Blue G
Page 71 and 72: Time (s) File I/O - Task-local File
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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