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Use a much shorter time to measure current cpu frequency #210

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Use a much shorter time to measure current cpu frequency #210

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7226cb8
Use a much shorter time to measure current cpu frequency
maxnoe Jan 4, 2024
710c80d
Add comment, account for time spend in ticks_fun
maxnoe Jan 4, 2024
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23 changes: 18 additions & 5 deletions cpuinfo/cpuinfo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -31,6 +31,7 @@
import platform
import multiprocessing
import ctypes
from time import perf_counter


CAN_CALL_CPUID_IN_SUBPROCESS = True
Expand Down Expand Up @@ -1517,19 +1518,31 @@ def new_func():
retval = get_ticks_x86_64
return retval

def get_raw_hz(self):
from time import sleep
def get_raw_hz(self, measurement_time=0.01):
from time import sleep, perf_counter_ns

ticks_fn = self.get_ticks_func()

# when testing, more consistent results between different
# measurement times were obtained by measuring the actual time
# spend, not just using the user-provided value. For some reason,
# it was also better to have the time around the ticks_func / sleep calls
# and then account for the time spend in the ticks_func
ticks_start = perf_counter_ns()
ticks_fn.func()
ticks_fn_time = perf_counter_ns() - ticks_start

t0 = perf_counter_ns()
start = ticks_fn.func()
sleep(1)
sleep(measurement_time)
end = ticks_fn.func()
t1 = perf_counter_ns()
measurement_time = (t1 - t0) - 2 * ticks_fn_time

ticks = (end - start)
frequency = 1e9 * (end - start) / measurement_time
ticks_fn.free()

return ticks
return frequency

def _get_cpu_info_from_cpuid_actual():
'''
Expand Down