Python | time.clock_gettime_ns() method

Last Updated : 17 Sep, 2019

Time module in Python provides various time-related functions. This module comes under Python’s standard utility modules. time.clock_gettime_ns() method of Time module is used to get the time (in nanoseconds) 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

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 nanoseconds of the specified clock clk_id.

Code #1: Use of time.clock_gettime_ns() method

Python3

# Python program to explain time.clock_gettime_ns() 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 nanoseconds) of the above  # specified clock clk_ids # using time.clock_gettime_ns() method t1 = time.clock_gettime_ns(clk_id1) t2 = time.clock_gettime_ns(clk_id2) t3 = time.clock_gettime_ns(clk_id3) t4 = time.clock_gettime_ns(clk_id4) t5 = time.clock_gettime_ns(clk_id5)   # Print the time (in nanoseconds) of  # different clock clk_ids print("System-wide real-time clock time: % d nanoseconds" % t1) print("Monotonic clock time: % d nanoseconds" % t2) print("Monotonic (raw-hardware based) clock time: % d nanoseconds" % t3) print("Thread-specific CPU time clock: % d nanoseconds" % t4) print("Per-process timer from the CPU: % d nanoseconds" % t5)

Output:

  System-wide real-time clock time: 1568588052857445167 nanoseconds  Monotonic clock time: 13129927039288 nanoseconds  Monotonic (raw-hardware based) clock time: 13129927039811 nanoseconds  Thread-specific CPU time clock: 27169892 nanoseconds  Per-process timer from the CPU: 27171779 nanoseconds

Code #2: Using an integer value as parameter of time.clock_gettime_ns() method

Python3

# Python program to explain time.clock_gettime_ns() 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 nanoseconds) # for the specified clock clk_ids # using time.clock_gettime_ns() method t1 = time.clock_gettime_ns(clk_id1) t2 = time.clock_gettime_ns(clk_id2)  # Print the time in nanoseconds print("System-wide real-time clock time: % d nanoseconds" % t1) print("Monotonic clock time: % d nanoseconds" % t2)

Output:

  System-wide real-time clock time: 1568588180971305067 nanoseconds  Monotonic clock time: 13258040899143 nanoseconds

Reference: https://docs.python.org/3/library/time.html#time.clock_gettime

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Python | time.clock_gettime_ns() method

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