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查看线程的方法:
          ps -efL, 其中的LWP是线程ID(why是这个), nlwp是线程数.
UID        PID  PPID   LWP  C NLWP STIME TTY          TIME CMD
也就是第四位，是它的线程ID，而第二位则是进程的PID，第三位是子进程号：
[root@iZ25dcp92ckZ ~]# ps -efL|grep httpmut root     28740 28265 28740  0    3 21:49 pts/0    00:00:00 [httpmut: master process] master process root     28740 28265 28742  0    3 21:49 pts/0    00:00:00 [httpmut: master process] master process root     28740 28265 28743  0    3 21:49 pts/0    00:00:00 [httpmut: master process] master process 48       28741 28740 28741  0    3 21:49 pts/0    00:00:00 [httpmut: worker process] worker process 48       28741 28740 28744  0    3 21:49 pts/0    00:00:00 [httpmut: worker process] worker process 48       28741 28740 28745  0    3 21:49 pts/0    00:00:00 [httpmut: worker process] worker process

ps -T -p 9613
  PID  SPID TTY          TIME CMD
9613  9613 pts/1    00:00:00 thread01
9613  9712 pts/1    00:00:00 thread01
9613  9795 pts/1    00:00:00 thread01
9613  9853 pts/1    00:00:00 thread01

看线程PID:
ps -efL|grep logstash|awk '{print $4}'|wc
    148     148     888

查看进程28740是主进程，28741是子进程，28265则是程序的主进程来自:
[root@iZ25dcp92ckZ ~]# ps aux|grep 28265
root     28265  0.0  0.3 116648  3412 pts/0    Ss   21:29   0:00 -bash：
也就是bash终端~



[root@iZ25dcp92ckZ ~]# ps aux|grep httpmut root     28740  0.0  0.2 193092  2444 pts/0    Sl+  21:49   0:00 [httpmut: master process] master process 48       28741  0.0  0.0 193092   856 pts/0    Sl+  21:49   0:00 [httpmut: worker process] worker process

列名分别是：
UID        PID  PPID   LWP  C NLWP STIME TTY          TIME CMD
其中
UID为User ID.
PID为processid,进程标识符
PPID为 parent processid，父进程标识符2，
LWP为light weight process orthread， 轻量级进程，即线程标识符
NLWP为，number oflwps(threads) in the process, 线程的数量

摘自：http://blog.csdn.net/jiafu1115/article/details/19070015

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48属于www用户的id，这儿我这个没有添加，所以没有显示www，对上面这些线程进行跟踪：
strace -f -p 28740 -p 28742 -p 28743 -p 28741 -p 28744 -p 28745 -p 28788 Process 28740 attached with 3 threads strace: attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted strace: attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted Process 28741 attached with 3 threads strace: attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted strace: attach: ptrace(PTRACE_ATTACH, ...): Operation not permitted strace: attach: ptrace(PTRACE_ATTACH, ...): No such process [pid 28745] futex(0x608420, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...> [pid 28744] futex(0x608340, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...> [pid 28741] epoll_wait(4,  <unfinished ...> [pid 28743] futex(0x608420, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...> [pid 28742] futex(0x608340, FUTEX_WAIT_PRIVATE, 0, NULL <unfinished ...> [pid 28740] wait4(-1,
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1、 cat /proc/${pid}/status
Threads:        2 //这个是核心，2个线程！如下：
[root@test multepoolserver]# cat /proc/26202/status
Name:   multipepollserv
State:  S (sleeping)
SleepAVG:       58%
Tgid:   26202
Pid:    26202
PPid:   18260
TracerPid:      0
Uid:    0       0       0       0
Gid:    0       0       0       0
FDSize: 256
Groups: 0 1 2 3 4 6 10
VmPeak:    26036 kB
VmSize:    26036 kB
VmLck:         0 kB
VmHWM:      1144 kB
VmRSS:      1144 kB
VmData:    10508 kB
VmStk:        84 kB
VmExe:        16 kB
VmLib:      3052 kB
VmPTE:        80 kB
StaBrk: 03103000 kB
Brk:    03124000 kB
StaStk: 7fff73219100 kB
Threads:        2
SigQ:   1/70656
SigPnd: 0000000000000000
ShdPnd: 0000000000000000
SigBlk: 0000000000000000
SigIgn: 0000000000001000
SigCgt: 0000000180004407
CapInh: 0000000000000000
CapPrm: 00000000fffffeff
CapEff: 00000000fffffeff
Cpus_allowed:   00000000,00000000,00000000,00000000,00000000,00000000,00000000,000000ff
Mems_allowed:   00000000,00000003

2、pstree -p ${pid}
[root@test multepoolserver]# pstree -p 26202
multipepollserv(26202)─┬─multipepollserv(26203)
                       └─{multipepollserv}(26204)

26204 就是一个线程。

[root@test multepoolserver]# ps aux|grep httpmut
root     26202  0.0  0.0  26036  1144 pts/10   Sl+  17:35   0:00 [httpmut: master process] H?????5r%
www      26203  0.0  0.0  15840   468 pts/10   S+   17:35   0:00 [httpmut: worker process] H?????5r%

3、top -p ${pid} 再按H   或者直接输入 top -bH -d 3 -p  ${pid}
[root@test multepoolserver]# top -p 26202
按大写的H(shift+h)，就能看到有几个线程：
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
26202 root      18   0 26036 1144  984 S  0.0  0.0   0:00.00 multipepollserv
26204 root      20   0 26036 1144  984 S  0.0  0.0   0:00.00 multipepollserv

top -bH -d 3 -p 26202  //3秒刷新一次
[root@test multepoolserver]# top -bH -d 3 -p 26202
top - 17:39:34 up 650 days,  3:35, 10 users,  load average: 1.04, 1.01, 1.01
Tasks:   2 total,   0 running,   2 sleeping,   0 stopped,   0 zombie
Cpu(s):  0.9%us,  0.3%sy,  0.0%ni, 97.8%id,  0.9%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   8180460k total,  7648040k used,   532420k free,  1269016k buffers
Swap:  8385920k total,   218976k used,  8166944k free,  4855668k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
26202 root      18   0 26036 1144  984 S  0.0  0.0   0:00.00 multipepollserv
26204 root      20   0 26036 1144  984 S  0.0  0.0   0:00.00 multipepollserv

top -H
手册中说：-H : Threads toggle
加上这个选项启动top，top一行显示一个线程。否则，它一行显示一个进程。

4、ps xH
手册中说：H Show threads as if they were processes
这样可以查看所有存在的线程。

5、ps -mp <PID>
手册中说：m Show threads after processes
这样可以查看一个进程起的线程数。
http://liulinxia02.blog.163.com/blog/static/268687720111129103740947/

[root@test multepoolserver]# ps aux|grep httpmut
root     26202  0.0  0.0  26036  1144 pts/10   Sl+  17:35   0:00 [httpmut: master process] H?????5r%
www      26203  0.0  0.0  15840   468 pts/10   S+   17:35   0:00 [httpmut: worker process] H?????5r%
root     26206  0.0  0.0  61172   748 pts/14   S+   17:35   0:00 grep httpmut
[root@test multepoolserver]# ps -mp 26202
  PID TTY          TIME CMD
26202 pts/10   00:00:00 multipepollserv
    - -        00:00:00 -
    - -        00:00:00 -
[root@test multepoolserver]# ps -mp 26203
  PID TTY          TIME CMD
26203 pts/10   00:00:00 multipepollserv
    - -        00:00:00 -







——————————————————————————————————————————

在linux中查看线程数的三种方法

在linux中查看线程数的三种方法
  www.2cto.com  
1、top -H
手册中说：-H : Threads toggle
加上这个选项启动top，top一行显示一个线程。否则，它一行显示一个进程。

2、ps xH
手册中说：H Show threads as if they were processes
这样可以查看所有存在的线程。

3、ps -mp <PID>
手册中说：m Show threads after processes

这样可以查看一个进程起的线程数。

来源：http://www.2cto.com/os/201212/177103.html
更多：http://www.360doc.com/content/13/0512/13/9085503_284797175.shtml

作者：jackxiang@向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除
地址：http://jackxiang.com/post/6514/
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