ps命令实用方法.ps -l ps -L详解

一、统计sleep状态的进程.

c233 plugins # ps -elf|head -1
F S UID     PID   PPID C PRI   NI       ADDR　　 SZ  　　WCHAN 　　 STIME TTY TIME　　   CMD
4 S root 28149  4204    0 80     0             -       16283 　　 poll_s 　　    Jul05 ? 00:00:00 　　sshd: root

c233 plugins # ps -efl|awk '$2~/S/{print $0}'|wc -l                     //-l              long format. 
73

解释===>

(1)F列.

PROCESS FLAGS
The sum of these values is displayed in the "F" column, which is provided by the flags output specifier.
1 forked but didn't exec
4 used super-user privileges

(1)S列.

D Uninterruptible sleep (usually IO)
R Running or runnable (on run queue)
S Interruptible sleep (waiting for an event to complete)
T Stopped, either by a job control signal or because it is being traced.
W paging (not valid since the 2.6.xx kernel)
X dead (should never be seen)
Z Defunct ("zombie") process, terminated but not reaped by its parent.

(3)C列.C     pcpu         cpu utilization

(4)

command    COMMAND  see args. (alias args, cmd).

sz                    SZ       size in physical pages of the core image of the process. This
includes text, data, and stack space. Device mappings are currently
excluded; this is subject to change. See vsz and rss.

(5)WCHAN列.

wchan           WCHAN     name of the kernel function in which the process is sleeping,
a "-" if the process is running, or a "*" if the process is
multi-threaded and ps is not displaying threads.

二、统计当前运行的线程总数."-L"

c233 plugins # ps -eLf|grep -v $$|wc -l                              　　　　//-L              Show threads, possibly with LWP and NLWP columns

646

c233 plugins # ps -eLf|grep -v $$|tail

UID        PID  　　PPID    LWP  　　C 　 NLWP 　　STIME TTY   TIME   　　CMD

root 　 　　 1 　　 689 　　 0 　　 36 　　   Jul01 ? 00:00:06 　 /usr/sbin/nscd
root 　  　　 1 　　 690 　　 0 　　 36 　　   Jul01 ? 00:00:06 　 /usr/sbin/nscd
root 　  　　 4204 28149 　 0 　　 1 　　     Jul05 ? 00:00:00     sshd: root

NLWP (number of threads)

LWP (thread ID)

c233 plugins # ps -ef|grep nscd
root 23678 1 0 Jun30 ? 00:15:32 /usr/sbin/nscd

三、Linux下查看某个进程的线程数量.

1.根据进程号进行查询：

# pstree -p 进程号      //-p pid

# top -Hp 进程号        //-H : Threads toggle

2.根据进程名字进行查询：

# pstree -p `ps -e | grep sshd | awk '{print $1}'`

# pstree -p `ps -e | grep sshd | awk '{print $1}'` | wc -l

四、统计正在sleeop的线程总数.

d231 ~ # for i in `ps aux|awk '$8~/S/{print $2}'`;do             //如何让其累加？？如何查看正在运行的线程？？？？
> m=`pstree -p $i|wc -l`
> echo $m
> done
No such user name: PID
0
1184
42
1
1
13
1
1
1
1
1
1
1
1
2
2
0
0
61
1
8
1
1088
1