使用率及cpu使用率"/>
linux获取占用内存,linux下获取内存使用率及cpu使用率
以前看过linux下获取内存使用率及cpu使用率的方法,写的多少有点乱,改善了一下,运行程序可以直接获得内存使用率及cpu使用率,需求比较急的话,可以直接运行代码,获得结果
#include #include
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typedef struct PACKED //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
}CPU_OCCUPY;
typedef struct PACKED1 //定义一个mem 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 long total;
char name2[20];
unsigned long free;
}MEM_OCCUPY;
/*获取内存使用率*/ 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;
int n;
char buff[256];
char buff1[256];
char buff2[256];
char buff3[256];
char buff4[256];
MEM_OCCUPY *m;
m=mem;
float mem_use;
fd = fopen ("/proc/meminfo", "r");
fgets (buff1, sizeof(buff1), fd);
printf("%s\n",buff1);
int num1 = atoi(buff1+15);
printf("%d\n",num1);
fgets (buff2, sizeof(buff2), fd);
printf("%s\n",buff2);
int num2 = atoi(buff2+15);
fgets (buff3, sizeof(buff3), fd);
printf("%s\n",buff3);
int num3 = atoi(buff3+15);
fgets (buff4, sizeof(buff4), fd);
// sscanf (buff, "%s %u %s", m->name, &m->total, m->name2);
printf("%s\n",buff4);
int num4 = atoi(buff4+15);
fgets (buff, sizeof(buff), fd); //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
// sscanf (buff, "%s %u", m->name2, &m->free, m->name2);
// sscanf (buff, "%s %u", m->name2, &m->free);
printf("%s\n",buff);
// 内存使用率(MEMUsedPerc)=100*(MemTotal-MemFree-Buffers-Cached)/MemTotal
mem_use = (float)100*(num1-num2-num3-num4)/num1;
printf("内存使用率为:%.2f%%\n",mem_use);
fclose(fd); //关闭文件fd
}
/*获取cpu使用率*/ float cal_cpuoccupy (CPU_OCCUPY *o, CPU_OCCUPY *n) { unsigned long od, nd; unsigned long id, sd; float cpu_use = 0; od = (unsigned long) (o->user + o->nice + o->system +o->idle);//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);//第二次(用户+优先级+系统+空闲)的时间再赋给od id = (unsigned long) (n->user - o->user); //用户第一次和第二次的时间之差再赋给id sd = (unsigned long) (n->system - o->system);//系统第一次和第二次的时间之差再赋给sd if((nd-od) != 0) cpu_use = (float)((sd+id)*100)/(nd-od); //((用户+系统)乖100)除(第一次和第二次的时间差)再赋给g_cpu_used else cpu_use = 0; printf("cpu使用率为:%1.2f%%",cpu_use); return cpu_use; } 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; int n; 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", cpu_occupy->name, &cpu_occupy->user, &cpu_occupy->nice,&cpu_occupy->system, &cpu_occupy->idle); fclose(fd); } int main() { CPU_OCCUPY cpu_stat1; CPU_OCCUPY cpu_stat2; MEM_OCCUPY mem_stat; float cpu; //获取内存 get_memoccupy ((MEM_OCCUPY *)&mem_stat); //第一次获取cpu使用情况 get_cpuoccupy((CPU_OCCUPY *)&cpu_stat1); sleep(10); //第二次获取cpu使用情况 get_cpuoccupy((CPU_OCCUPY *)&cpu_stat2); //计算cpu使用率 cpu = cal_cpuoccupy ((CPU_OCCUPY *)&cpu_stat1, (CPU_OCCUPY *)&cpu_stat2); return 0; }
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linux获取占用内存,linux下获取内存使用率及cpu使用率
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