Python time.clock_gettime_ns()用法及代码示例

Python中的时间模块提供了各种与时间相关的函数。该模块属于Python的标准实用程序模块。

time.clock_gettime_ns()时间模块的方法用于获取指定时钟clk_id的时间(以纳秒为单位)。本质上，clk_id是一个整数值，代表时钟的id。

以下是UNIX平台上可用的可用作clk_id参数值的常量：

clk_id	clk_id常数	含义
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

用法： time.clock_gettime(clk_id)

参数：
clk_id:clk_id常数或代表时钟clk_id的整数值。

返回类型：此方法返回一个浮点值，该值表示指定时钟clk_id的时间(以纳秒为单位)。

代码1：用于time.clock_gettime_ns()方法

# 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)

输出：

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

代码2：使用整数值作为的参数time.clock_gettime_ns()方法

# 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)

输出：

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

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

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注：本文由纯净天空筛选整理自ihritik大神的英文原创作品 Python | time.clock_gettime_ns() method。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。