ios下如何获取CPU的使用率
如题，我用UIDevice-hardware中的cpuusage方法获取到cpu的使用率的数值，但是数据的波动很小，用了一些占用cpu的操作cpu数值也不会上涨上去，网上的资料关于在ios上获取cpu使用率也很少，都是其他平台的，大家有什么方法或者思路可以在这里分享下，大家一起讨论，目前我的思路只是获取每个进程id，然后读取每个id所占用的cpu使用率，但是具体的实现方法还没有，希望各位有什么想法的能分享下，谢谢啦
[解决办法]
xcode->open Developer Tool->Instruments可以选择CPU的监测
[解决办法]
http://hi.baidu.com/_violet_moon/item/c27bcf3d3d1cb3677d034be2
一篇关于ios iPhone/iPad 实时获取cpu,内存，硬盘等的使用情况的文章，试试看不知道能不能用
[解决办法]
楼上这个只获取了内存大小，没有获取到CPU，不过方法应该类同，接近了
[解决办法]
LZ自问自答了，帮不上忙，没研究过这方面的。
[解决办法]
-(float) cpu_usage
{
kern_return_t kr;
task_info_data_t tinfo;
mach_msg_type_number_t task_info_count;
task_info_count = TASK_INFO_MAX;
kr = task_info(mach_task_self(), TASK_BASIC_INFO, (task_info_t)tinfo, &task_info_count);
if (kr != KERN_SUCCESS) {
return -1;
}
task_basic_info_t basic_info;
thread_array_t thread_list;
mach_msg_type_number_t thread_count;
thread_info_data_t thinfo;
mach_msg_type_number_t thread_info_count;
thread_basic_info_t basic_info_th;
uint32_t stat_thread = 0; // Mach threads
basic_info = (task_basic_info_t)tinfo;
// get threads in the task
kr = task_threads(mach_task_self(), &thread_list, &thread_count);
if (kr != KERN_SUCCESS) {
return -1;
}
if (thread_count > 0)
stat_thread += thread_count;
long tot_sec = 0;
long tot_usec = 0;
float tot_cpu = 0;
int j;
for (j = 0; j < thread_count; j++)
{
thread_info_count = THREAD_INFO_MAX;
kr = thread_info(thread_list[j], THREAD_BASIC_INFO,
(thread_info_t)thinfo, &thread_info_count);
if (kr != KERN_SUCCESS) {
return -1;
}
basic_info_th = (thread_basic_info_t)thinfo;
if (!(basic_info_th->flags & TH_FLAGS_IDLE)) {
tot_sec = tot_sec + basic_info_th->user_time.seconds + basic_info_th->system_time.seconds;
tot_usec = tot_usec + basic_info_th->system_time.microseconds + basic_info_th->system_time.microseconds;
tot_cpu = tot_cpu + basic_info_th->cpu_usage / (float)TH_USAGE_SCALE * 100.0;
}
} // for each thread
kr = vm_deallocate(mach_task_self(), (vm_offset_t)thread_list, thread_count * sizeof(thread_t));
assert(kr == KERN_SUCCESS);
return tot_cpu;
}
