最近开始做服务器，要求获取当前的CPU核数，就做了个Demo，获取CPU核数。
系统环境：ubuntu16.04
CPU信息：Intel® Core™ i5-7200U CPU @ 2.50GHz × 4
代码如下（跨平台）：
#include <stdio.h>#if WIN32#include "windows.h"#else#include "unistd.h"#endifint main(){#if WIN32SYSTEM_INFO sysInfo;GetSystemInfo(&sysInfo);int allCPUNum_ = sysInfo.dwNumberOfProcessors;printf("all CPU Num:%d\n",allCPUNum_);#else //linux//获取当前系统的所有CPU核数，包含禁用的int allCPUNum_ = sysconf(_SC_NPROCESSORS_CONF);//获取当前系统的可用CPU核数int enableCPUNum_ = sysconf(_SC_NPROCESSORS_ONLN);printf("all CPU Num:%d\n",allCPUNum_);printf("enable CPU Num:%d\n",enableCPUNum_);#endifreturn 0;}
程序运行如下：
Starting /home/tck/learn/CPU_Num/build-CPU_Num-unknown-Debug/CPU_Num...all CPU Num:4enable CPU Num:4/home/tck/learn/CPU_Num/build-CPU_Num-unknown-Debug/CPU_Num exited with code 0
结尾：
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