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iphone - iOS - 从应用程序获取 CPU 使用率

转载 作者:IT老高 更新时间:2023-10-28 11:38:31 27 4
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有谁知道如何获取应用程序的 CPU 使用率?这绝对是可能的,因为应用商店中有应用程序( Activity Monitor Touch )可以显示它。

最佳答案

更新。这段代码对我有用:

更新 2。 thread_list 泄漏了,所以添加了 vm_deallocate

#import <mach/mach.h>
#import <assert.h>

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 < (int)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->user_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;
}

关于iphone - iOS - 从应用程序获取 CPU 使用率,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/8223348/

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