如果您正在尝试测量的python程序中执行此操作，则可以执行以下操作：
import time
# at the beginning of the script
startTime = time.time()
# ...
def getUptime():
"""
Returns the number of seconds since the program started.
"""
# do return startTime if you just want the process start time
return time.time() - startTime
否则，您别无选择，只能解析ps或进入/proc/pid。bash获取经过时间的一种不错的方法是：
ps -eo pid,etime | grep $YOUR_PID | awk '{print $2}'
这只会以以下格式打印经过的时间，因此它应该很容易解析：
days-HH:MM:SS
（如果运行了不到一天，那就只是HH:MM:SS）
开始时间如下所示：
ps -eo pid,stime | grep $YOUR_PID | awk '{print $2}'
不幸的是，如果您的过程不是 今天 开始的，那么只会给您开始的日期，而不是时间。
最好的方法是获取经过时间和当前时间，然后进行一些数学运算。以下是一个Python脚本，该脚本将PID作为参数，并为您执行上述操作，并打印出该过程的开始日期和时间：
import sys
import datetime
import time
import subprocess
# call like this: python startTime.py $PID
pid = sys.argv[1]
proc = subprocess.Popen(['ps','-eo','pid,etime'], stdout=subprocess.PIPE)
# get data from stdout
proc.wait()
results = proc.stdout.readlines()
# parse data (should only be one)
for result in results:
try:
result.strip()
if result.split()[0] == pid:
pidInfo = result.split()[1]
# stop after the first one we find
break
except IndexError:
pass # ignore it
else:
# didn't find one
print "Process PID", pid, "doesn't seem to exist!"
sys.exit(0)
pidInfo = [result.split()[1] for result in results
if result.split()[0] == pid][0]
pidInfo = pidInfo.partition("-")
if pidInfo[1] == '-':
# there is a day
days = int(pidInfo[0])
rest = pidInfo[2].split(":")
hours = int(rest[0])
minutes = int(rest[1])
seconds = int(rest[2])
else:
days = 0
rest = pidInfo[0].split(":")
if len(rest) == 3:
hours = int(rest[0])
minutes = int(rest[1])
seconds = int(rest[2])
elif len(rest) == 2:
hours = 0
minutes = int(rest[0])
seconds = int(rest[1])
else:
hours = 0
minutes = 0
seconds = int(rest[0])
# get the start time
secondsSinceStart = days*24*3600 + hours*3600 + minutes*60 + seconds
# unix time (in seconds) of start
startTime = time.time() - secondsSinceStart
# final result
print "Process started on",
print datetime.datetime.fromtimestamp(startTime).strftime("%a %b %d at %I:%M:%s %p")
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