C++ 获取Linux 服务器CPU占用率+内存空闲率(亲测绝对可以运行)
转自:C++ 获取Linux 服务器CPU占用率+内存空闲率(亲测绝对可以运行) - 远征i - 博客园 (cnblogs.com)
代码来自网络,部分修改,亲测绝对可用
C++:
#include<stdio.h> #include<stdlib.h> #include<string.h> #include <iostream> #include <unistd.h> using namespace std; typedef struct MEMPACKED //定义一个mem occupy的结构体 { char name1[20]; //定义一个char类型的数组名name有20个元素 unsigned long MemTotal; char name2[20]; unsigned long MemFree; char name3[20]; unsigned long Buffers; char name4[20]; unsigned long Cached; char name5[20]; unsigned long SwapCached; }MEM_OCCUPY; //proc/stat文件结构 //cpu 633666 46912 249878 176813696 782884 2859 19625 0 //cpu0 633666 46912 249878 176813696 782884 2859 19625 0 //intr 5812844 //ctxt 265816063 //btime 1455203832 //processes 596625 //procs_running 1 //procs_blocked 0 typedef struct CPUPACKED //定义一个cpu occupy的结构体 { char name[20]; //定义一个char类型的数组名name有20个元素 unsigned int user; //定义一个无符号的int类型的user unsigned int nice; //定义一个无符号的int类型的nice unsigned int system;//定义一个无符号的int类型的system unsigned int idle; //定义一个无符号的int类型的idle unsigned int lowait; unsigned int irq; unsigned int softirq; }CPU_OCCUPY; void get_memoccupy(MEM_OCCUPY *mem) //对无类型get函数含有一个形参结构体类弄的指针O { FILE *fd; char buff[256]; MEM_OCCUPY *m; m = mem; fd = fopen("/proc/meminfo", "r"); //MemTotal: 515164 kB //MemFree: 7348 kB //Buffers: 7892 kB //Cached: 241852 kB //SwapCached: 0 kB //从fd文件中读取长度为buff的字符串再存到起始地址为buff这个空间里 fgets(buff, sizeof(buff), fd); sscanf(buff, "%s %lu ", m->name1, &m->MemTotal); fgets(buff, sizeof(buff), fd); sscanf(buff, "%s %lu ", m->name2, &m->MemFree); fgets(buff, sizeof(buff), fd); sscanf(buff, "%s %lu ", m->name3, &m->Buffers); fgets(buff, sizeof(buff), fd); sscanf(buff, "%s %lu ", m->name4, &m->Cached); fgets(buff, sizeof(buff), fd); sscanf(buff, "%s %lu", m->name5, &m->SwapCached); fclose(fd); //关闭文件fd } int get_cpuoccupy(CPU_OCCUPY *cpust) //对无类型get函数含有一个形参结构体类弄的指针O { FILE *fd; char buff[256]; CPU_OCCUPY *cpu_occupy; cpu_occupy = cpust; fd = fopen("/proc/stat", "r"); fgets(buff, sizeof(buff), fd); sscanf(buff, "%s %u %u %u %u %u %u %u", cpu_occupy->name, &cpu_occupy->user, &cpu_occupy->nice, &cpu_occupy->system, &cpu_occupy->idle, &cpu_occupy->lowait, &cpu_occupy->irq, &cpu_occupy->softirq); fclose(fd); return 0; } void cal_cpuoccupy(CPU_OCCUPY *o, CPU_OCCUPY *n) { unsigned long od, nd; double cpu_use = 0; od = (unsigned long)(o->user + o->nice + o->system + o->idle + o->lowait + o->irq + o->softirq);//第一次(用户+优先级+系统+空闲)的时间再赋给od nd = (unsigned long)(n->user + n->nice + n->system + n->idle + n->lowait + n->irq + n->softirq);//第二次(用户+优先级+系统+空闲)的时间再赋给od double sum = nd - od; double idle = n->idle - o->idle; cpu_use = idle / sum; idle = n->user + n->system + n->nice - o->user - o->system - o->nice; cpu_use = idle / sum; printf("%.3f\n",cpu_use); } int main( int argc, char **argv ) { MEM_OCCUPY mem_stat; CPU_OCCUPY cpu_stat1; CPU_OCCUPY cpu_stat2; //获取内存 //(MemTotal - MemFree)/ MemTotal get_memoccupy((MEM_OCCUPY *)&mem_stat); //printf(" [MemTotal] = %lu \n [MemFree] = %lu \n [Buffers] = %lu \n [Cached] = %lu \n [SwapCached] = %lu \n", mem_stat.MemTotal, mem_stat.MemFree, mem_stat.Buffers, mem_stat.Cached, mem_stat.SwapCached); printf("%.3f\n", mem_stat.MemFree * 1.0 / ( mem_stat.MemTotal * 1.0 ) ); //第一次获取cpu使用情况 get_cpuoccupy((CPU_OCCUPY *)&cpu_stat1); usleep(100000); //第二次获取cpu使用情况 get_cpuoccupy((CPU_OCCUPY *)&cpu_stat2); //计算cpu使用率 cal_cpuoccupy((CPU_OCCUPY *)&cpu_stat1, (CPU_OCCUPY *)&cpu_stat2); return 0; }
编译
g++ get.cpp -o get
运行
[root@xxxxxxx ]# ./get
0.117
1.000
[root@xxxxxxx ]# ./get
0.119
0.000
上方的数值代表 内存空闲 / 内存总数
下方的数值代表 CPU占用率
详细解释:
https://blog.csdn.net/nineday/article/details/1928847
计划搭建一个简易版的分布式集群...
一台主服务器,一台高配的数据库服务器,n 台计算服务器
(1)在每台计算服务器中,写一个定时任务,每隔 1 s 触发一个PHP程序,该PHP将触发上方的CPP程序,获得服务器状态,更新DATABASE中的服务器状态表
(2)主服务器将获得客户端的请求,插入DATABASE中的消息队列表
(3)主服务器中将写一个servlet 定时函数,每隔 0.5 s 轮询消息队列表,一旦发现有新的消息请求集合或个体,则将该消息集合转换成所封装对象的队列
(4)从前往后扫描队列,每次选定 DATABASE中空闲资源最大的 一台计算服务器,发送一个包含JSON格式对象的HTTP请求
(5)计算服务器接收到HTTP请求后,将展开计算,计算完成后,更新DATABASE中的数据字段
(6)客户端AJAX 0.5s 轮询DATABASE,直到完成计算服务器完成计算
【上方集群中,采用 jsp + servlet 实现 java 后台。。。。。。得抓紧学习spring大家族啊,被技术限制住了......虽然servlet本身是单实例多线程的】
主服务器 servlet多线程 --- 任务队列 --- 分布式并行计算 --- 计算服务器 servlet多线程
不知道并发咋样。。。第一次碰分布式和并发这块...
如果有大佬可以指点下,会非常感谢的!!!!!!