Hi,
I want to get overall cpu utilization of device programmatically in my iphone app. I am able to get cpu utilization for my app using the below code. Can you please help me to get overall cpu utilization of device not just my app?
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; / basic_info = (task_basic_info_t)tinfo; / 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; } } / kr = vm_deallocate(mach_task_self(), (vm_offset_t)thread_list, thread_count * sizeof(thread_t)); assert(kr == KERN_SUCCESS); return tot_cpu; }You should look at the Mach host APIs, starting with
<mach/host_info.h>Do you want do this just for debugging? Or are you planning to leave this code in your shipping app?
IMO this latter is a long-term compatibility concern. The philosophy of the iOS sandbox is that apps should only be able to get information about themselves, not about other apps or the system as a whole. Certain low-level APIs that were grandfathered in from OS X run counter to this philosophy. Over time the sandbox has a habit of catching up with these discrepancies. For example, in iOS 9 the sandbox prevents you from getting a [list of all processes on the system via sysctl]706]. While I don't have anything specific to say about the Mach host APIs, it's not hard to imagine them running afoul of the sandbox at some point in the future.
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