Python | time.clock_gettime() method
Last Updated :
17 Sep, 2019
time.clock_gettime() method of
Time module is used to get the time of the specified clock clk_id. Basically,
clk_id is a integer value which represents the id of the clock.
Following are the constants available on UNIX platforms that can be used as value of
clk_id parameter:
| clk_id |
clk_id constant |
Meaning |
| 0
| time.CLOCK_REALTIME |
System-wide real-time clock |
| 1
| time.CLOCK_PROCESS_CPUTIME_ID |
High-resolution per-process timer from the CPU |
| 2
| time.CLOCK_MONOTONIC |
It represents monotonic time since some unspecified starting point |
| 3
| time.CLOCK_THREAD_CPUTIME_ID |
Thread-specific CPU-time clock |
| 4
| time.CLOCK_MONOTONIC_RAW |
Similar to time.CLOCK_MONOTONIC, but provides access to a raw hardware-based time that is not subject to NTP adjustments |
Note: time.clock_gettime() method is only available on UNIX-like systems.
Syntax: time.clock_gettime(clk_id)
Parameter:
clk_id: A clk_id constant or an integer value representing clk_id of the clock.
Return type: This method returns a float value which represents the time (in seconds) of the specified clock clk_id.
Code #1: Use of
time.clock_gettime() method
Python3
# Python program to explain time.clock_gettime() method
# importing time module
import time
# clk_id for System-wide real-time clock
clk_id1 = time.CLOCK_REALTIME
# clk_id for monotonic clock
clk_id2 = time.CLOCK_MONOTONIC
# clk_id for monotonic (Raw hardware
# based time) clock
clk_id3 = time.CLOCK_MONOTONIC
# clk_id for Thread-specific CPU-time clock
clk_id4 = time.CLOCK_THREAD_CPUTIME_ID
# clk_id for High-resolution
# per-process timer from the CPU
clk_id5 = time.CLOCK_PROCESS_CPUTIME_ID
# Get the time (in seconds) of the above
# specified clock clk_ids
# using time.clock_gettime() method
t1 = time.clock_gettime(clk_id1)
t2 = time.clock_gettime(clk_id2)
t3 = time.clock_gettime(clk_id3)
t4 = time.clock_gettime(clk_id4)
t5 = time.clock_gettime(clk_id5)
# Print the time (in seconds) of
# different clock clk_ids
print("Value of system-wide real-time clock time:", t1)
print("Value of monotonic clock time:", t2)
print("Value of monotonic (raw-hardware based) clock time:", t3)
print("Value of thread-specific CPU time clock:", t4)
print("Value of per-process timer from the CPU:", t5)
Output:
Value of system-wide real-time clock time: 1568586677.79805
Value of monotonic clock time: 11754.867643594
Value of monotonic (raw-hardware based) clock time: 11754.867644148
Value of thread-specific CPU time clock: 0.03590527
Value of per-process timer from the CPU: 0.035907437
Code #2: Using an integer value as parameter of
time.clock_gettime() method
Python3
# Python program to explain time.clock_gettime() method
# importing time module
import time
# value of clk_id for time.CLOCK_REALTIME
# clock id constant which represents
# System-wide real-time clock is 0
clk_id1 = 0
# value of clk_id for time.CLOCK_MONOTONIC
# clock id constant which represents
# a monotonic clock is 2
clk_id2 = 2
# Get the time (in seconds)
# for the specified clock clk_ids
# using time.clock_gettime() method
t1 = time.clock_gettime(clk_id1)
t2 = time.clock_gettime(clk_id2)
# Print the time in seconds
print("Value of system-wide real-time clock time:", t1)
print("Value of monotonic clock time:", t2)
Output:
Value of system-wide real-time clock time: 1568587204.9810832
Value of monotonic clock time: 12282.050676627
Reference: https://docs.python.org/3/library/time.html#time.clock_gettime
