登陆题目详情
单选题 OpenMP指定使用线程数目的方式,可以使用库函数( )指定,也可以使用子句( )指定,还可以通过环境变量( )设置
学科：并行计算技术
时间：2023-05-20 07:22:27
题目1单选题
#include "omp.h" int main(){ omp_set_num_threads(4); #pragma omp parallel sections { #pragma omp section printf("section 1 Id = %d\n",omp_get_thread_num()); #pragma omp section printf("section 2 Id = %d\n",omp_get_thread_num()); } return 0; } 正常执行结果是()A. section 1 Id = 0 section 2 Id = 0B. section 1 Id = 1 section 2 Id = 1C. section 1 Id = 0 section 2 Id = 2 section 4 Id = 3 section 3 Id = 1D. section 1 Id = 0 section 2 Id = 1
题目2单选题
OpenMP是一种面向( )内存的多处理器( )并行编程( )A. 共享,多进程,技术B. 共享,多线程,语言C. 共享,多线程,技术D. 分布,多线程,技术
题目3单选题
section是( )划分线程,并行性的好坏依赖于( )A. 手工,程序员B. 自动,程序员C. 手工,系统D. 自动,系统
题目4单选题
#include "omp.h" int main(){ omp_set_num_threads(4); #pragma omp parallel { #pragma omp sections { #pragma omp section printf("section 1 threadID = %d\n",omp_get_thread_num()); #pragma omp section printf("section 2 threadID = %d\n",omp_get_thread_num()); } #pragma omp sections { #pragma omp section printf("section 3 threadID = %d\n",omp_get_thread_num()); #pragma omp section printf("section 4 threadID = %d\n",omp_get_thread_num()); } } return 0; } 正常执行的一种可能的结果是()A. section 1 threadID = 0 section 2 threadID = 1 section 3 threadID = 3 section 4 threadID = 3B. section 1 threadID = 1 section 2 threadID = 0 section 3 threadID = 0 section 4 threadID = 1C. section 1 threadID = 0 section 2 threadID = 0 section 3 threadID = 1 section 4 threadID = 1D. section 1 threadID = 1 section 2 threadID = 0 section 3 threadID = 2 section 4 threadID = 2
题目5单选题
上图是OpenMP应用程序运行时的()模型A. Message-PassingB. ParallelC. Fork-JoinD. Master-Slave
题目6单选题
OpenMP主线程在运行过程中,遇到并行编译指导语句需要进行并行计算的时候,( )出多个线程来执行并行任务.在并行执行时,主线程和派生线程共同工作.在并行代码结束执行后,派生线程退出或者挂起,不再工作,控制流程回到单独的主线程中——( )A. 派生,汇合B. Join,汇合C. Fork,派生D. 汇合,派生
题目7单选题
两个sections语句是( )执行的A. 并行B. 并发C. 随机D. 串行
题目8单选题
sections的主要功能是将一个任务分成( )的几个section,每个section由不同的( )来处理A. 关联,线程B. 独立,线程C. 独立,进程D. 关联,进程
题目9单选题
OpenMP指定使用线程数目的方式,可以使用库函数( )指定,也可以使用子句( )指定,还可以通过环境变量( )设置A. omp_set_num_thread,num_threads,OMP_NUM_THREADSB. num_threads,omp_set_num_threads,OMP_NUM_THREADSC. omp_set_num_threads,OMP_NUM_THREADS ,num_threadsD. omp_set_num_threads,num_threads,OMP_NUM_THREADS
题目10单选题
#include #include void SectionsTest03(){ omp_set_num_threads(8); #pragma omp parallel { #pragma omp sections nowait //第1个sections { #pragma omp section { cout<<"section 1 线程ID:"<<omp_get_thread_num()<<"\n"; } #pragma omp section { cout<<"section 2 线程ID:"<<omp_get_thread_num()<<"\n"; } #pragma omp section { cout<<"section 3 线程ID:"<<omp_get_thread_num()<<"\n"; } } #pragma omp sections //第2个sections { #pragma omp section { cout<<"section 4 线程ID:"<<omp_get_thread_num()<<"\n"; } #pragma omp section { cout<<"section 5 线程ID:"<<omp_get_thread_num()<<"\n"; } #pragma omp section { cout<<"section 6 线程ID:"<<omp_get_thread_num()<<"\n"; } } } } 正常运行结果是()A. section 1 线程ID:6 section 5 线程ID:3 section 2 线程ID:1 section 4 线程ID:4 section 3 线程ID:3 section 6 线程ID:2B. section 1 线程ID:6 section 5 线程ID:3 section 2 线程ID:1 section 4 线程ID:4 section 3 线程ID:1 section 6 线程ID:2C. section 1 线程ID:0 section 5 线程ID:3 section 2 线程ID:1 section 4 线程ID:4 section 3 线程ID:5 section 6 线程ID:2D. section 1 线程ID:2 section 5 线程ID:3 section 2 线程ID:1 section 4 线程ID:4 section 3 线程ID:5 section 6 线程ID:2