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Charla Benson
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3 icc icpc ifort mpiicc mpiicpc mpiifort <Install dir> C C++ Fortran mpicc C++ mpic++, mpicxx C++ mpif77,mpif90 Fortran : <VTune Install dir> = /opt/intel/vtune_amplifier_xe/ Copyright 2011, XLsoft K.K. All rights reserved. 3

6 Fortran 12.1 Co-array Fortran Fortran 2008(ISO/IEC :2004) Fortran IV/77/90/95/2003 (Fortran 2008 ) ISO ISO/IEC 1539:1991 ISO/IEC :1997 ISO/IEC1539-1:2004 ANSI X ANSI X ANSIX ANSI X3J3/ ISO/IEC :2004 Copyright 2011, XLsoft K.K. All rights reserved. 6

7 C C++11(ISO/IEC 14882:2011) IEEE ( CilkPlus) C/C++ C99 (C++11 ) ISO/IEC 9899:1990 ISO/IEC 9899:1999 ISO/IEC 14882:1998) ISO/IEC 14882: bit long double Copyright 2011, XLsoft K.K. All rights reserved. 7

8 x86_64 source <composer Install dir>/bin/compilervars.sh intel64 source <icc Install dir>/bin/iccvars.sh intel64 source <ifort Install dir>/bin/ifortvars.sh intel64 x86_64 MPI source <Intel MPI Install dir>/bin64/mpivars.sh VTune Amplifier XE source <VTune Install dir>/amplxe-vars.sh Trace Analyzer/Collector source <TA/TC Install dir>/bin/itacvars.sh composer icc ifort C.sh.csh Copyright 2011, XLsoft K.K. All rights reserved. 8

9 C: icc [ ] < > C++: icpc [ ] < > Fortran: ifort [ ] < > MPI( ) C: mpiicc [ ] < > C++: mpiicpc [ ] < > Fortran: mpiifort [ ] < > < > [ ] < > [ ] : icc -O3 -xavx -ipo main.c func1.c func2.c obj_c.o icpc main.cpp func1.cpp func2.cpp obj_cpp.o ifort -O3 -xsse4.2 prog.f90 sub.f -o my_prog_name.out obj_c.o.c obj_cpp.cpp Copyright 2011, XLsoft K.K. All rights reserved. 9

10 (Linux ) ( ) OpenMP: (SandyBridge ) Trace Collector mpiicc -parallel < > mpiicc -openmp < > mpiicc -O3 < > mpiicc -xavx < > mpiicc -ipo < > mpiicc -vec_report3 < > mpiicc -trace -g < > Trace Analyzer/ Collector : mpiicc -O3 -xavx -ipo [-openmp] [-parallel] < > mpiicc icc ifort, mpiicpc, mpiifort ( -trace mpiicc, mpiicpc, mpifort ) Copyright 2011, XLsoft K.K. All rights reserved. 10

11 (Linux ) -O0 -O1, -O2, -O3 -x, -ax, -m -ipo -openmp -parallel -prof_gen, -prof_use -guide -vec_report<number> -par_report<number> -fast -fp-model <model> (3 ) OpenMP (Profile Guided Optimization PGO ) ( 1,2,3,4,5 ) ( 1,2,3 ) -ipo -O3 -no-prec-div -static -xhost (model strict, precise, fast ) Copyright 2011, XLsoft K.K. All rights reserved. 11

17 : -parallel Parallelizer -par_report[n] n 0,1,2,3 int_sin.cpp(74): (col. 4) remark: :. int_sin.cpp(92): (col. 6) remark: :. -par-threshold[n] n int_sin.c(92): (col. 6) remark:. Copyright 2011, XLsoft K.K. All rights reserved. 17

18 : -m,-x,-ax Vectorizer SIMD Single Instruction Multiple Data for ( i=0; i<max; i++ ) c[i] = a[i] + b[i]; -no-vec -xavx Intel AVX 1 1 MAX A + B SIMD 1 8 MAX/8 A8 A7 A6 A5 A4 A3 A2 A B8 B7 B6 B5 B4 B3 B2 B1 C C8 C7 C6 C5 C4 C3 C2 C1 AVX float Copyright 2011, XLsoft K.K. All rights reserved. 18

19 -m,-x,-ax -x<code> <code>=host,avx,sse4. 2,SSE4.1,SSE3_ATOM,SS SE3,SSE3,SSE2 -ax<code> <code>=avx,sse4.2,sse 4.1,SSSE3,SSE3,SSE2 -m<code> <code>=ia32, sse2, sse3, ssse3, sse4.1 AVX SSE4.2 :-xavx AVX SSE4.2 SSE4.1 SSSE3 SSE3 SSE2 SSE AFX SSE4.2 :-axavx AVX SSE4.2 SSE4.1 SSSE3 SSE3 SSE2 SSE ia32 sse2 :-msse4.1 SSE4.1 SSSE3 SSE3 SSE2 SSE Copyright 2011, XLsoft K.K. All rights reserved. 19

21 : -guide Guided Auto Parallelization: GAP -guide-par -guide-vec -guide-data-trans gap_vec.c(8): remark #30536: (LOOP) -fargument-noalias ( ) 8 [ ] [ ] "matrix_mul_matrix" "restrict" 8 [ ] "restrict" Copyright 2011, XLsoft K.K. All rights reserved. 21

22 : -fp-model precise strict -fp-model fast t0 = 4.1f + t1 + t2 float t0, t1, t2 t0 = 4.0f + 0.1f + t1 + t2 -fp-model precise -fp-model strict t0 = (4.1f + t1) + t2 t0 = (((4.0f + 0.1f) + t1) + t2) Copyright 2011, XLsoft K.K. All rights reserved. 22

No Time to Read This Book?

Chapter 1 No Time to Read This Book? We know what it feels like to be under pressure. Try out a few quick and proven optimization stunts described below. They may provide a good enough performance gain