The start times of processes as reported by ps fluctuates
occasionally.
The following command line shows differences in consecutive
ps invocations, each 1 s apart. /proc/1721/stat field 19
shows a constant start time of 6143 jiffies since boot for
the mysqld process. The start time shown by ps fluctuates
between 12:13:26 and 12:13:27 and the start times for
(all?) other processes fluctuates by the same amount (1 s).
This bug may be related to the other time related bugs of
ps.
s:~# while true ; do mv x2 x1 ; uptime ; cat /proc/1721/stat ; ps axww -o user,pid,start,ni,stat,cp,vsz,rss,%mem,comm --sort -vsz|head -n 5 >x2 ; diff x1 x2 ; sleep 1 ; done
mv: cannot stat `x2': No such file or directory
14:56:31 up 2:44, 1 user, load average: 1.09, 1.03, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
diff: x1: No such file or directory
14:56:32 up 2:44, 1 user, load average: 1.09, 1.03, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:33 up 2:44, 1 user, load average: 1.09, 1.03, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:34 up 2:44, 1 user, load average: 1.09, 1.03, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:35 up 2:44, 1 user, load average: 1.08, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:36 up 2:44, 1 user, load average: 1.08, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:38 up 2:44, 1 user, load average: 1.08, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
2,5c2,5
< mysql 1721 12:13:26 0 Sl 0 127480 3740 1.4 mysqld
< klaus 2130 12:13:35 0 Sl 0 69036 1204 0.4 webserv.bin
< bernhard 3377 14:08:43 19 SN+ 0 40320 36636 14.2 setiathome-5.27
< bernhard 3378 14:08:43 19 SN+ 0 40320 36636 14.2 setiathome-5.27
---
14:56:39 up 2:44, 1 user, load average: 1.08, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:40 up 2:44, 1 user, load average: 1.08, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:41 up 2:44, 1 user, load average: 1.07, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:42 up 2:44, 1 user, load average: 1.07, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:43 up 2:44, 1 user, load average: 1.07, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:44 up 2:44, 1 user, load average: 1.07, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:45 up 2:44, 1 user, load average: 1.07, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:46 up 2:44, 1 user, load average: 1.07, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:47 up 2:44, 1 user, load average: 1.07, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:48 up 2:44, 1 user, load average: 1.07, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:49 up 2:44, 1 user, load average: 1.07, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:50 up 2:44, 1 user, load average: 1.07, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:51 up 2:44, 1 user, load average: 1.06, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:52 up 2:44, 1 user, load average: 1.06, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
2,5c2,5
< mysql 1721 12:13:27 0 Sl 0 127480 3740 1.4 mysqld
< klaus 2130 12:13:36 0 Sl 0 69036 1204 0.4 webserv.bin
< bernhard 3377 14:08:44 19 SN+ 0 40320 36636 14.2 setiathome-5.27
< bernhard 3378 14:08:44 19 SN+ 0 40320 36636 14.2 setiathome-5.27
---
14:56:53 up 2:44, 1 user, load average: 1.06, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:54 up 2:44, 1 user, load average: 1.06, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
14:56:55 up 2:44, 1 user, load average: 1.06, 1.02, 1.00
1721 (mysqld) S 1684 1012 1012 0 -1 8397056 5201 0 108 0 16 3 0 0 16 0 10 0 6143 130539520 935 4294967295 134512640 141288252 3215515600 3215513164 4294960144 0 552967 4102 26345 4294967295 0 0 17 0 0 0
Bernhard