一些常见的pragma指令用于并行编程包括: #pragma omp parallel:用于创建一个并行区域,其中的代码将被多个线程并行执行。 #pragma omp for:用于在并行区域中并行执行一个for循环。 #pragma omp sections:用于在并行区域中将代码分割成多个部分,并由不同的线程并行执行。 #pragma omp task:用于创建一个可以被并行执行的...
pragma omp parallel [clauses]{ code_block//这段代码并行}#pragma omp [parallel] for [clauses]{ for_statement//for循环会被并行执行}#pragma omp [parallel] sections [clauses]{//..可以有些不并行的部分 #pragma omp section { code_block //这里才并行 } } ...
用sections把不同的区域交给不同的线程去执行 用法: #include<omp.h> #include<iostream> using namespace std; int main() { omp_set_num_threads(3); #pragma omp parallel sections { #pragma omp section { cout <<omp_get_thread_num(); } #pragma omp section { cout << omp_get_thread_num(...
pragma omp parallel sections { pragma omp section up=temp+h*(8*fp-5*fc[2]+4*fc[1]-fc[0])/3;pragma omp section u=temp+h*(9*fp+19*fc[2]-5*fc[1]+fc[0])/24;}
#pragma omp parallel sections Description Theomp parallel sectionsdirective effectively combines theomp parallelandomp sectionsdirectives. This directive lets you define a parallel region containing a singlesectionsdirective in one step. Syntax .-+---+---. | '-,-' | V | >>-#--pragma--omp pa...
#include <omp.h> #include <iostream> int main(int argc, char** argv) { { int nThreads = 2; omp_set_num_threads( nThreads ); int val = 0; std::cout << "Value of \"val\" before the OpenMP parallel region: " << val << std::endl; #pragma omp parallel default(none) shared...
其中omp是OpenMP的一个关键字.在制导指令名 directive_name后可以附加参数parameters(子句clauses)等 选项. #pragmaompdirective-name[clause,...]newline 制导指令前缀。对 所有的OpenMP语 句都需要这样的前 缀。 OpenMP制导指 令。在制导指令前 缀和子句之间必须 有一个正确的 OpenMP制导指 令。 子句。在没有...
OPENMP_DIRECTIVE_EXT(parallel_sections, "parallel sections") OPENMP_DIRECTIVE_EXT(for_simd, "for simd") +OPENMP_DIRECTIVE_EXT(declare_simd, "declare simd") // OpenMP clauses. OPENMP_CLAUSE(if, OMPIfClause) Index: include/clang/Basic/Attr.td ...
OPENMP_DIRECTIVE_EXT(parallel_sections, "parallel sections") OPENMP_DIRECTIVE_EXT(for_simd, "for simd") +OPENMP_DIRECTIVE_EXT(declare_simd, "declare simd") // OpenMP clauses. OPENMP_CLAUSE(if, OMPIfClause) Index: include/clang/Basic/Attr.td ...
This pragma is used in GCC (GNU Compiler Collection) to control optimization options. It allows you to specify optimization levels for specific functions or code sections. #pragma GCC optimize("O3") // Optimize with level 3 pragma omp: ...