添加到变量中的python附加值

Question

我正在两台服务器上运行一个python zabbix trapper脚本，它在其中一台服务器上运行得很好。它每30秒运行一次。这是代码的一部分，从"ss“读取time_wait状态

file_log = "/tmp/tcpstate.log"
proc = open(file_log,"a")

file = "/var/log/safesquid/safesquid/performance/performance.log"
time_wait_cmd = subprocess.Popen("ss -o state time-wait | grep webcache | wc -l",shell=True,stdout=subprocess.PIPE)
ssquid_time = time_wait_cmd.communicate()[0]
proc_string = datetime.datetime.now().strftime("%d-%m-%y %H:%M:%S") + " " + "Time_WAIT: " + ssquid_time  + "\n"
proc.write(proc_string)
proc.close()

来自server1的输出：(OK)

01-05-12 17:40:50 Time_WAIT: 286
01-05-12 17:41:20 Time_WAIT: 251
01-05-12 17:41:50 Time_WAIT: 366
01-05-12 17:42:20 Time_WAIT: 335
01-05-12 17:42:50 Time_WAIT: 287
01-05-12 17:43:20 Time_WAIT: 375
01-05-12 17:43:51 Time_WAIT: 386
01-05-12 17:44:21 Time_WAIT: 383

Server2的输出：(问题)

01-05-12 17:44:03 Time_WAIT: 368
01-05-12 17:44:32 Time_WAIT: 388
01-05-12 17:45:01 Time_WAIT: 0
01-05-12 17:45:01 Time_WAIT: 339
01-05-12 17:45:31 Time_WAIT: 311
01-05-12 17:46:00 Time_WAIT: 400
01-05-12 17:46:01 Time_WAIT: 0
01-05-12 17:46:29 Time_WAIT: 411
01-05-12 17:46:58 Time_WAIT: 448

因为它每30秒被调用一次，我不确定为什么在Server2上它会得到"0“值，然后立即读取正确的值。

ANy知道为什么会发生这种情况吗？

Answer 1

这两个进程是否都在接收信号？这可能会导致系统调用比预期更早终止。