當我通過ssh運作像iostat -dkx 2 2這樣的指令時,我得到了預期的結果,但是本地計算機上的程序在“可中斷睡眠”狀态下表示活着.為什麼會這樣?有沒有辦法找出這種行為的原因?
完整指令:
$ssh -o ConnectTimeout=4 -o ChallengeResponseAuthentication=no -o PasswordAuthentication=no @host> iostat -dkx 2 2
ps輸出:
$ps aux | grep 11893 && ps aux | grep PID
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
1000 10273 0.0 0.0 103280 904 pts/0 S+ 12:09 0:00 grep PID
1000 11893 0.0 0.0 158732 3892 ? S Feb17 0:00 ssh -o ConnectTimeout=4 -o ChallengeResponseAuthentication=no -o PasswordAuthentication=no @ iostat -dkx 2 2
1000 10285 0.0 0.0 103280 904 pts/0 S+ 12:09 0:00 grep 11893
strace的:
$strace -p 11893
Process 11893 attached - interrupt to quit
select(8, [5], [], NULL, NULL^C
WCHAN:
$cat /proc/11893/wchan
poll_schedule_timeout
堆棧跟蹤:
$cat /proc/11893/stack
[] poll_schedule_timeout+0x39/0x60
[] do_select+0x6bb/0x7c0
[] core_sys_select+0x18a/0x2c0
[] sys_select+0x47/0x110
[] system_call_fastpath+0x16/0x1b
[] 0xffffffffffffffff