openmp查看最大线程数量

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

project(omp_test)

find_package(OpenMP REQUIRED)
if (OPENMP_FOUND)
    message("OpenMP found!")
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS}")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS}")
    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} ${OpenMP_EXE_LINKER_FLAGS}")
endif()

add_executable(omp_test omp_test.cpp)

omp_test.cpp

#include <iostream>
#include <string>
#include <omp.h>

using namespace std;

int main(){
    int numProcs = omp_get_num_procs();
    cout << "omp_get_num_procs() = " << numProcs << endl;
    return 0;
}