UInt32 HawkProfiler::GetProcessorNumber()
{
if (!m_iCpuCount)
m_iCpuCount = get_processor_number();
return m_iCpuCount;
}
float get_cpu_usage()
{
//cpu数量
static int processor_count_ = get_processor_number();
//上一次的时间
static __int64 last_time_ = 0;
static __int64 last_system_time_ = 0;
FILETIME now;
FILETIME creation_time;
FILETIME exit_time;
FILETIME kernel_time;
FILETIME user_time;
__int64 system_time;
__int64 time;
__int64 system_time_delta;
__int64 time_delta;
float cpu = -1;
GetSystemTimeAsFileTime(&now);
if (!GetProcessTimes(GetCurrentProcess(), &creation_time, &exit_time,
&kernel_time, &user_time))
{
return -1;
}
system_time = (file_time_2_utc(&kernel_time) + file_time_2_utc(&user_time)) / processor_count_;
time = file_time_2_utc(&now);
if ((last_system_time_ == 0) || (last_time_ == 0))
{
// First call, just set the last values.
last_system_time_ = system_time;
last_time_ = time;
return -1;
}
system_time_delta = system_time - last_system_time_;
time_delta = time - last_time_;
assert(time_delta != 0);
if (time_delta == 0)
return -1;
// We add time_delta / 2 so the result is rounded.
cpu = (((float)system_time_delta * 100 + (float)time_delta / 2) / time_delta);
last_system_time_ = system_time;
last_time_ = time;
return cpu;
}
