如何在Linux中的python中检索进程的开始时间(或正常运行时间)?
我只知道,我可以调用“ ps -p my_process_id -f”,然后解析输出。但这并不酷。
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
/proc/pid
bash
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)
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")