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QPX Usage – Hints for the Compiler Compiler needs hints – Hint compiler to likely iteration counts – Instruct compiler to align fields – Tell that FOTRAN assumed-shape arrays are contiguous -qassert=contig real*8 :: x(:),y(:),a !ibm* align(32, x, y) !ibm* assert(itercnt(100)) do i=m, n z(i) = x(i) + a*y(i) enddo double __align(32) *x, *y; double a; #pragma disjoint(*x, *y) #pragma disjoint(*x, a) #pragma ibm iterations(100) for (int i=m;i
IBM XL QPX Intrinsics • New intrinsic variable type – C/C++: vector4double – FORTRAN: vector(real(8)) • Wide set of elemental functions available – LOAD,STORE, MULT, MULT-ADD, ROUND, CEILING, SQRT,… • Strengths: – User may layout calculation by hand, if compiler not smart enough (e.g. where no loop) • Easy to use: – Leave stack, register layout, load/store scheduling to compiler 59
Page 1 and 2:
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 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: IBM XL Compiler Support for QPX Usa
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 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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