OpenMP Application Programming Interface Examples

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1 2 Example collapse.3.c C / C++ S-1 #include S-2 #include S-3 void work(int a, int j, int k); S-4 void sub() S-5 { S-6 int j, k, a; S-7 #pragma omp parallel num_threads(2) S-8 { S-9 #pragma omp for collapse(2) ordered private(j,k) schedule(static,3) S-10 for (k=1; k
1 2 3 4 5 6 1.8 linear Clause in Loop Constructs The following example shows the use of the linear clause in a loop construct to allow the proper parallelization of a loop that contains an induction variable (j). At the end of the execution of the loop construct, the original variable j is updated with the value N/2 from the last iteration of the loop. Example linear_in_loop.1.c C / C++ S-1 #include S-2 S-3 #define N 100 S-4 int main(void) S-5 { S-6 float a[N], b[N/2]; S-7 int i, j; S-8 S-9 for ( i = 0; i < N; i++ ) S-10 a[i] = i + 1; S-11 S-12 j = 0; S-13 #pragma omp parallel S-14 #pragma omp for linear(j:1) S-15 for ( i = 0; i < N; i += 2 ) { S-16 b[j] = a[i] * 2.0f; S-17 j++; S-18 } S-19 S-20 printf( "%d %f %f\n", j, b[0], b[j-1] ); S-21 /* print out: 50 2.0 198.0 */ S-22 S-23 return 0; S-24 } C / C++ 22 <strong>OpenMP</strong> <strong>Examples</strong> Version 4.5.0 - November 2016
Page 1 and 2: OpenMP Application Programming Inte
Page 3 and 4: Contents Introduction 1 Examples 2
Page 5 and 6: 4.5.3. declare target and end decla
Page 7 and 8: 9.5. Nested Loop Constructs . . . .
Page 9 and 10: 1 Examples 2 3 4 5 6 7 8 9 10 11 Th
Page 11 and 12: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Page 13 and 14: 1 2 3 4 5 1.2 The parallel Construc
Page 15 and 16: 1 2 3 4 5 1.3 Controlling the Numbe
Page 17 and 18: S-29 !$omp single S-30 ! If OMP_NUM
Page 19 and 20: 1 2 3 4 Example nthrs_dynamic.2.c C
Page 21 and 22: S-7 S-8 DO 100 I = 1,10 S-9 !$OMP D
Page 23 and 24: S-19 ENDDO S-20 !$OMP END DO NOWAIT
Page 25 and 26: 1 2 3 4 5 6 7 8 9 10 11 12 1.7 The
Page 27: Fortran 1 2 3 4 5 6 7 8 9 10 11 12
Page 31 and 32: 1 2 3 4 5 6 1.9 The parallel sectio
Page 33 and 34: Fortran 1 Example fpriv_sections.1.
Page 35 and 36: Fortran 1 Example single.1.f S-1 SU
Page 37 and 38: Fortran (cont.) 1 2 3 4 5 6 7 8 9 1
Page 39 and 40: S-14 S-15 END SUBROUTINE WSHARE6_WR
Page 41 and 42: Fortran 1 Example master.1.f S-1 SU
Page 43 and 44: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1.
Page 45 and 46: 1 2 3 4 5 6 1.16 The omp_get_num_th
Page 47 and 48: 1 CHAPTER 2 2 OpenMP Affinity 3 4 5
Page 49 and 50: 1 2 3 4 5 6 2.1 The proc_bind Claus
Page 51 and 52: Fortran 1 2 3 4 5 6 7 8 9 10 11 12
Page 53 and 54: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Page 55 and 56: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Page 57 and 58: S-24 S-25 socket_num = omp_get_plac
Page 59 and 60: 1 2 3 4 5 6 7 8 3.1 The task and ta
Page 61 and 62: Fortran 1 2 3 4 5 The following exa
Page 63 and 64: 1 2 3 4 5 6 7 8 9 10 Example taskin
Page 65 and 66: Fortran 1 2 3 4 5 6 7 8 9 10 11 Exa
Page 67 and 68: 1 2 Example tasking.7.c C / C++ S-1
Page 69 and 70: Fortran 1 2 3 4 5 6 7 8 9 Example t
Page 71 and 72: 1 2 Example tasking.10.c C / C++ S-
Page 73 and 74: Fortran 1 2 3 4 5 6 7 Example taski
Page 75 and 76: S-16 state = new_state; S-17 } S-18
Page 77 and 78: Fortran 1 Example tasking.14.f90 S-
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S-17 call compute_array(matrix(:, i
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Fortran 1 2 3 The program will alwa
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1 2 3 4 S-13 printf("x = %d\n", x);
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Fortran 1 2 3 4 5 The last two task
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1 2 3 4 5 6 7 8 9 10 3.4 The taskgr
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S-22 endif S-23 !$omp task S-24 cal
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S-13 call something_critical() S-14
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Fortran 1 Example taskloop.1.f90 S-
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1 2 3 4 5 6 4.1 target Construct 4.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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1 2 3 4 5 6 7 8 9 C / C++ In C, the
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1 2 3 4 5 6 7 S-12 for (i=0; iTHRES
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1 2 3 4 5 6 7 8 9 10 11 4.2 target
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1 2 3 4 5 6 Example target_data.2.c
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1 2 3 4 5 6 C / C++ In the followin
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 C
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S-12 subroutine vec_mult(p1,v3,v4,N
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S-12 do i=1,N S-13 p(i) = v1(i) * v
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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Fortran 1 Example target_unstructur
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S-19 p[i] = p[i] + (v1[i] * v2[i]);
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Fortran 1 Example target_update.2.f
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Fortran 1 2 3 4 5 6 7 Example decla
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1 2 3 4 5 6 7 implicit device data
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Fortran 1 Example declare_target.4.
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Fortran 1 Example declare_target.5.
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S-27 #pragma omp parallel for S-28
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1 2 3 4 5 6 7 8 9 10 11 4.6 teams C
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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1 2 Example teams.3.c C / C++ S-1 f
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Fortran 1 Example teams.4.f90 S-1 m
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1 2 3 4 5 6 7 8 9 4.6.6 target team
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1 2 3 4 5 6 C / C++ The Fortran ver
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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1 2 Example async_target.3.c C / C+
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1 2 Example async_target.4.c C / C+
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1 2 3 4 5 6 7 8 9 4.8 Array Section
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1 2 3 4 Example array_sections.3.c
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1 2 3 4 5 6 4.9 Device Routines 4.9
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1 2 3 4 5 4.9.2 omp_get_num_devices
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1 2 3 4 5 6 7 8 9 10 11 12 4.9.4 Ta
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1 CHAPTER 5 2 SIMD 3 4 5 6 7 8 9 10
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Fortran 1 2 3 4 5 6 7 8 9 10 11 12
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S-9 end do S-10 call work(a, b, N )
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1 2 3 4 5 6 Example SIMD.4.c C / C+
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1 2 Example SIMD.6.c C / C++ S-1 #p
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1 2 Example SIMD.7.c C / C++ S-1 #i
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1 Example SIMD.8.c C / C++ S-1 #inc
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S-43 print 2, "passed", pri S-44 el
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 Th
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S-12 S-13 !$OMP CRITICAL(YAXIS) S-1
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1 2 3 4 5 6 7 8 9 10 6.2 Worksharin
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1 2 3 4 5 6 7 8 9 10 11 6.3 Binding
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1 2 3 4 5 6 7 8 9 6.4 The atomic Co
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S-37 S-38 DO I = 1,1000 S-39 X(I) =
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S-14 * Use fetch_and_add to impleme
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1 2 3 4 6.5 Restrictions on the ato
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S-15 !$OMP ATOMIC UPDATE S-16 I = I
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S-40 /* because they were not acces
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1 2 3 4 5 6.7 The ordered Clause an
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Fortran 1 2 3 4 Example ordered.2.f
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1 2 3 4 5 6 7 8 9 10 11 12 13 6.8 D
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S-14 A[i][j] = foo(i, j); S-15 S-16
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S-16 p(k,j,i) = (tmp1 + tmp2 + tmp3
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1 2 6.9 Lock Routines This section
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Fortran 1 2 3 4 5 6 7 8 9 10 11 12
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1 2 Example simple_lock.1.c C / C++
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1 2 3 4 6.9.5 Nestable Lock Routine
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S-43 SUBROUTINE NESTLOCK(P) S-44 US
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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1 2 3 4 5 6 The following example d
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Fortran (cont.) S-11 !$OMP END PARA
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1 2 3 4 5 6 7 S-25 END PROGRAM INC_
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Fortran 1 Example default_none.1.f
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Fortran 1 2 3 4 5 Example private.1
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1 S-10 for (i=0; i
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S-19 !$OMP END SINGLE S-20 !$OMP EN
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Fortran (cont.) 1 2 3 4 5 6 7 The f
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Fortran (cont.) S-1 PROGRAM PRIV_RE
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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1 2 3 4 5 6 7.8 The lastprivate Cla
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1 2 3 S-16 END DO S-17 S-18 END SUB
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Fortran (cont.) S-10 S-11 END PROGR
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Fortran 1 2 3 4 5 6 7 Example reduc
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1 2 3 4 5 7.10 The copyin Clause Th
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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1 2 3 4 S-11 S-12 !$OMP BARRIER S-1
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1 2 3 4 5 6 7 8 9 10 7.12 C++ Refer
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S-1 program example S-2 integer ::
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1 2 3 4 5 6 7 8 9 8.1 The OpenMP Me
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1 Example mem_model.2.c C / C++ S-1
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1 Example mem_model.3.c C / C++ S-1
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1 2 8.2 Race Conditions Caused by I
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1 2 3 4 5 6 CONTROL VARIABLES Inter
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
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Fortran 1 Example icv.1.f S-1 progr
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Fortran 1 Example standalone.1.f90
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1 Example standalone.2.f90 S-1 SUBR
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S-34 #pragma omp barrier S-35 phase
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S-35 #pragma omp taskwait S-36 } S-
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1 2 3 4 5 9.5 Nested Loop Construct
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Fortran 1 Example nested_loop.2.f S
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Fortran 1 2 3 The following orphane
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1 2 3 4 5 Example nesting_restrict.
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1 2 Example nesting_restrict.6.c C
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1 2 3 4 5 A.2 Changes from 4.0.1 to
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