如何在python中检索流程开始时间(或正常运行时间)

如何在python中检索流程开始时间(或正常运行时间),第1张

如何在python中检索流程开始时间(或正常运行时间)

如果您正在尝试测量的python程序中执行 *** 作,则可以执行以下 *** 作:

import time# at the beginning of the scriptstartTime = 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 }'

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 }'

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 *** 作,并打印出该过程的开始日期和时间:

import sysimport datetimeimport timeimport subprocess# call like this: python startTime.py $PIDpid = sys.argv[1]proc = subprocess.Popen(['ps','-eo','pid,etime'], stdout=subprocess.PIPE)# get data from stdoutproc.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 itelse:    # didn't find one    print "Process PID", pid, "doesn't seem to exist!"    sys.exit(0)pidInfo = [result.split()[1] for result in resultsif 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 timesecondsSinceStart = days*24*3600 + hours*3600 + minutes*60 + seconds# unix time (in seconds) of startstartTime = time.time() - secondsSinceStart# final resultprint "Process started on",print datetime.datetime.fromtimestamp(startTime).strftime("%a %b %d at %I:%M:%S %p")


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