iPhone-iOS-从应用程序获取CPU使用率
有谁知道如何获取应用程序的CPU使用率？ 绝对有可能，因为应用商店中有一些可以显示它的应用程序(活动监视器触摸)。
3个解决方案
74 votes
更新。 这段代码为我工作：
更新2。thread_list泄漏，因此添加了vm_deallocate
#import
#import
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;
}
ivanzoid answered -07-09T18:06:54Z
8 votes
对于Swift 3：
fileprivate func cpuUsage() -> Double {
var kr: kern_return_t
var task_info_count: mach_msg_type_number_t
task_info_count = mach_msg_type_number_t(TASK_INFO_MAX)
var tinfo = [integer_t](repeating: 0, count: Int(task_info_count))
kr = task_info(mach_task_self_, task_flavor_t(TASK_BASIC_INFO), &tinfo, &task_info_count)
if kr != KERN_SUCCESS {
return -1
}
var thread_list: thread_act_array_t? = UnsafeMutablePointer(mutating: [thread_act_t]())
var thread_count: mach_msg_type_number_t = 0
defer {
if let thread_list = thread_list {
vm_deallocate(mach_task_self_, vm_address_t(UnsafePointer(thread_list).pointee), vm_size_t(thread_count))
}
}
kr = task_threads(mach_task_self_, &thread_list, &thread_count)
if kr != KERN_SUCCESS {
return -1
}
var tot_cpu: Double = 0
if let thread_list = thread_list {
for j in 0 ..< Int(thread_count) {
var thread_info_count = mach_msg_type_number_t(THREAD_INFO_MAX)
var thinfo = [integer_t](repeating: 0, count: Int(thread_info_count))
kr = thread_info(thread_list[j], thread_flavor_t(THREAD_BASIC_INFO),
&thinfo, &thread_info_count)
if kr != KERN_SUCCESS {
return -1
}
let threadBasicInfo = convertThreadInfoToThreadBasicInfo(thinfo)
if threadBasicInfo.flags != TH_FLAGS_IDLE {
tot_cpu += (Double(threadBasicInfo.cpu_usage) / Double(TH_USAGE_SCALE)) * 100.0
}
} // for each thread
}
return tot_cpu
}
fileprivate func convertThreadInfoToThreadBasicInfo(_ threadInfo: [integer_t]) -> thread_basic_info {
var result = thread_basic_info()
result.user_time = time_value_t(seconds: threadInfo[0], microseconds: threadInfo[1])
result.system_time = time_value_t(seconds: threadInfo[2], microseconds: threadInfo[3])
result.cpu_usage = threadInfo[4]
result.policy = threadInfo[5]
result.run_state = threadInfo[6]
result.flags = threadInfo[7]
result.suspend_count = threadInfo[8]
result.sleep_time = threadInfo[9]
return result
}
Lionking answered -07-09T18:07:14Z
0 votes
试试这个：
- (NSString *)cpuUsage
{
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 @"NA";
}
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 @"NA";
}
if (thread_count > 0)
stat_thread += thread_count;
long tot_idle = 0;
long tot_user = 0;
long tot_kernel = 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 nil;
}
basic_info_th = (thread_basic_info_t)thinfo;
if (basic_info_th->flags & TH_FLAGS_IDLE)
{
//This is idle
tot_idle = tot_idle + basic_info_th->user_time.microseconds + basic_info_th->system_time.microseconds;
} else {
//This is user
tot_user = tot_user + basic_info_th->user_time.microseconds;
//This is kernel
tot_kernel = tot_kernel + basic_info_th->system_time.microseconds;
}
} // for each thread
kr = vm_deallocate(mach_task_self(), (vm_offset_t)thread_list, thread_count * sizeof(thread_t));
assert(kr == KERN_SUCCESS);
long tot_cpu = tot_idle + tot_user + tot_kernel
return [NSString stringWithFormat:@"Idle: %.2f, User: %.2f, Kernel: %.2f", tot_idle/tot_cpu, tot_user/tot_cpu, tot_kernel/tot_cpu];
}
但是，该方法会根据每个过程的起点来计算百分比。 如果您正在寻找更传统的方式来计算这些数字，请参见Petesh的答案。
Coder256 answered -07-09T18:07:39Z
