请问如何利获取CPU利用率

jcs4989

有没有什么系统函数之类的，或其他程序方法获取CPU利用率的？
如果有，那么内存利用率呢？

谢谢指教！

webstroller

linux的可以看/proc/meminfo和/proc/stat

Bayweb

top命令源代码下载：http://www.groupsys.com/top/download.shtml
工程下载： http://www.cppblog.com/Files/dyj057/mytop.zip
下面是获得系统CPU和内存情况的代码：

void
get_system_info(info)
     struct system_info * info;
{
     char buffer[ 4096 + 1 ];
     int fd, len;
     char * p;
     int i;

     /* get load averages */
    {
    fd = open( " loadavg " , O_RDONLY);
    len = read(fd, buffer, sizeof (buffer) - 1 );
    close(fd);
    buffer[len] = ' \0 ' ;

    info -> load_avg[ 0 ] = strtod(buffer, & p);
    info -> load_avg[ 1 ] = strtod(p, & p);
    info -> load_avg[ 2 ] = strtod(p, & p);
    p = skip_token(p); /* skip running/tasks */
    p = skip_ws(p);
     if ( * p)
        info -> last_pid = atoi(p);
     else
        info -> last_pid = - 1 ;
    }

     /* get the cpu time info */
    {
    fd = open( " stat " , O_RDONLY);
    len = read(fd, buffer, sizeof (buffer) - 1 );
    close(fd);
    buffer[len] = ' \0 ' ;

    p = skip_token(buffer); /* "cpu" */
    cp_time[ 0 ] = strtoul(p, & p, 0 );
   
    cp_time[ 1 ] = strtoul(p, & p, 0 );
    cp_time[ 2 ] = strtoul(p, & p, 0 );
    cp_time[ 3 ] = strtoul(p, & p, 0 );

     /* convert cp_time counts to percentages */
    percentages( 4 , cpu_states, cp_time, cp_old, cp_diff);
    }
   
     /* get system wide memory usage */
    {
     char * p;

    fd = open( " meminfo " , O_RDONLY);
    len = read(fd, buffer, sizeof (buffer) - 1 );
    close(fd);
    buffer[len] = ' \0 ' ;

     /* be prepared for extra columns to appear be seeking
       to ends of lines */
   
    p = buffer;
    p = skip_token(p);
    memory_stats[ 0 ] = strtoul(p, & p, 10 ); /* total memory */
   
    p = strchr(p, ' \n ' );
    p = skip_token(p);
    memory_stats[ 1 ] = strtoul(p, & p, 10 ); /* free memory */
   
   
    p = strchr(p, ' \n ' );
    p = skip_token(p);
    memory_stats[ 2 ] = strtoul(p, & p, 10 ); /* buffer memory */
   
    p = strchr(p, ' \n ' );
    p = skip_token(p);
    memory_stats[ 3 ] = strtoul(p, & p, 10 ); /* cached memory */
   
     for (i = 0 ; i < 8 ;i ++ ) {
        p ++ ;
        p = strchr(p, ' \n ' );
    }
   
    p = skip_token(p);
    memory_stats[ 4 ] = strtoul(p, & p, 10 ); /* total swap */
   
    p = strchr(p, ' \n ' );
    p = skip_token(p);
    memory_stats[ 5 ] = strtoul(p, & p, 10 ); /* free swap */
   
    }

     /* set arrays and strings */
    info -> cpustates = cpu_states;
    info -> memory = memory_stats;
}

原文地址 http://www.cppblog.com/dyj057/archive/2007/01/31/18221.aspx