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
import time
clk_id1 = time.CLOCK_REALTIME
clk_id2 = time.CLOCK_MONOTONIC
clk_id3 = time.CLOCK_MONOTONIC
clk_id4 = time.CLOCK_THREAD_CPUTIME_ID
clk_id5 = time.CLOCK_PROCESS_CPUTIME_ID
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 ( "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
import time
clk_id1 = 0
clk_id2 = 2
t1 = time.clock_gettime_ns(clk_id1)
t2 = time.clock_gettime_ns(clk_id2)
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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