mirror of
https://github.com/OpenMP/Examples.git
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82 lines
2.0 KiB
C
82 lines
2.0 KiB
C
/*
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* @@name: allocators.6
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* @@type: C
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* @@operation: run
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* @@expect: success
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* @@version: omp_5.2
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*/
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#include <omp.h>
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#include <stdio.h>
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#pragma omp requires dynamic_allocators
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int calc(int i, int j) { return i*j;}
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#pragma omp declare target(calc)
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int main()
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{
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#define N 256
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int sum;
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int xbuf[N];
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static omp_allocator_handle_t cgroup_alloc;
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#pragma omp declare target(cgroup_alloc)
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const omp_alloctrait_t cgroup_traits[1] =
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{{omp_atk_access, omp_atv_cgroup}};
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/*** CASE 1: ***/
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for (int i = 0; i < N; i++) { xbuf[i] = 0;}
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// uses predefined allocator, no need to declare it in uses_allocators
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#pragma omp target teams reduction(+:xbuf) thread_limit(N) \
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allocate(omp_cgroup_mem_alloc:xbuf) num_teams(4)
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{
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#pragma omp parallel for
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for (int i = 0; i < N; i++) {
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xbuf[i] += calc(i,omp_get_team_num());
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}
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}
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sum = 0;
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#pragma omp parallel for reduction(+:sum)
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for (int i = 0; i < N; i++) {
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sum += xbuf[i];
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}
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if(sum == 3*(N-1)*N) printf("PASSED 1 of 2\n");
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/*** CASE 2: ***/
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for (int i = 0; i < N; i++) { xbuf[i] = 0; }
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// initializes the allocator in target region
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#pragma omp target
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cgroup_alloc = omp_init_allocator(
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omp_default_mem_space, 1, cgroup_traits);
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// uses the initialized allocator
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#pragma omp target
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#pragma omp teams reduction(+:xbuf) thread_limit(N) \
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allocate(cgroup_alloc:xbuf) num_teams(4)
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{
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#pragma omp parallel for
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for (int i = 0; i < N; i++) {
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xbuf[i] += calc(i,omp_get_team_num());
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}
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}
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// destroys the allocator after its use
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#pragma omp target
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omp_destroy_allocator(cgroup_alloc);
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sum = 0;
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#pragma omp parallel for reduction(+:sum)
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for (int i = 0; i < N; i++) {
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sum += xbuf[i];
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}
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if(sum == 3*(N-1)*N) printf("PASSED 2 of 2\n");
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return 0;
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}
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