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分类: 系统运维

2016-11-22 16:58:48


查看进程何时开始执行
ps -eo comm,lstart
bash            Tue Nov 22 15:46:39 2016
flush-253:0     Thu Dec 25 08:07:07 2014
sshd            Tue Nov 22 16:46:00 2016
bash            Tue Nov 22 16:46:00 2016
rsyslogd        Mon Jan 25 15:12:46 2016
agent           Tue Nov 22 17:07:00 2016
ps              Tue Nov 22 17:07:00 2016
sshd            Tue Jan 27 19:55:06 2015
bluetooth       Tue Jan 27 17:00:18 2015

跟踪某命令的执行过程
 strace ping -c 1
execve("/bin/ping", ["ping", "-c", "1", ""], [/* 28 vars */]) = 0
brk(0)                                  = 0x7fc69259c000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7fc690c13000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=44088, ...}) = 0
mmap(NULL, 44088, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7fc690c08000
close(3)                                = 0
open("/lib64/libidn.so.11", O_RDONLY)   = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\0/\200Y:\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=209120, ...}) = 0
mmap(NULL, 2301768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7fc6907c3000
mprotect(0x7fc6907f5000, 2093056, PROT_NONE) = 0
mmap(0x7fc6909f4000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x31000) = 0x7fc6909f4000
close(3)                                = 0
open("/lib64/libc.so.6", O_RDONLY)      = 3

ps -eo pid,command,user,psr

 

psr 代表当前不同命令跑在不同的核心上

2085 gnome-power-manager         gdm        1
 2086 /usr/libexec/gdm-simple-gre gdm        3
 2089 /usr/libexec/polkit-1/polki root       0
 2098 /usr/bin/pulseaudio --start gdm        1
 2100 /usr/libexec/rtkit-daemon   rtkit      2
 2103 sshd: root@pts/0            root       0
 2107 pam: gdm-password           root       2
 2114 -bash                       root       0
 2138 sshd: root@pts/1            root       0
 2142 -bash                       root       0
 2171 top                         root       3
 2182 sshd: root@pts/2            root       0
 2186 -bash                       root       3


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