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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,因为应用程序商店(Activity Monitor Touch)中有应用程序可以显示它.

我需要在OS X上获得目标C/C的总CPU空闲时间吗？

如果可能的话请提供代码示例.这是我用来获取这些指标的代码.结果百分比与我在Activity Monitor中的百分比不同.所以我假设CPU时间计算不正确:

#include <sys/sysctl.h>
#include <sys/types.h>
#include <mach/mach.h>
#include <mach/processor_info.h>
#include <mach/mach_host.h>

- (void)printCPUUsage
{
    processor_cpu_load_info_t cpuLoad;
    mach_msg_type_number_t processorMsgCount;
    natural_t processorCount;

    uint64_t totalSystemTime = 0, totalUserTime = 0, totalIdleTime = 0, totalCPUTime = 0;

    kern_return_t err = host_processor_info(mach_host_self(), PROCESSOR_CPU_LOAD_INFO, &processorCount, (processor_info_array_t *)&cpuLoad, &processorMsgCount);

    for (natural_t i = 0; i < processorCount; i++) {

        // Calc load types and totals, with guards against 32-bit overflow
        // (values are natural_t)
        uint64_t system = 0, user = 0, idle = 0, …