linux ps 查看线程
... Complex Processes - Threads...
Some OSes, including other Unixes, have the seperate concept of a process optionally consisting of several seperate threads, or light weight processes. Each thread is part of the same program but are scheduled individually.
Until comparatively recently Linux just had processes, but it provides a more versatile sort of fork, called clone, which allows more control over the relationship between parent and child, allowing them to share memory space, file handles, signals etc and so provide thread facilities using Linux processes
Since Linux 2.4.19 (or so) threads can share the pid of the parent process and have a seperate thread id, tid . Most processes have just the one thread and so their tid is is same as their pid
For more info see http://yolinux.com/TUTORIALS/LinuxTutorialPosixThreads.html for a tutorial on POSIX threads usage under Linux.
refer
Some CLI commands for viewing Process data...
- ps uax
- List all processes given some basic usage on utility use
- pstree
- Lists processes as a tree showing parental relationships
- pstree -p
- ditto but showing process numbers (pid)
- ps -eo pid,ppid,user,pgid,args --sort pid
- list all processes showing process id, parent pid, user name, process grop id and command arguments, sorted by pid
- ps -eLf
- list all processes showing pid, ppid, tid (LWP), and number of threads in group, NLWP
An example of a thread.....
UID PID PPID LWP C NLWP STIME TTY TIME CMD ... root 1753 1 1753 0 2 Feb27 ? 00:00:01 auditd root 1753 1 1755 0 2 Feb27 ? 00:00:03 auditd
Notice the same PID but with different LWP (TID).
ps -eLf (man ps)
UID PID PPID LWP C NLWP STIME TTY TIME CMD xce 746324 222631 776421 0 70 2012 ? 00:00:46 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 776422 0 70 2012 ? 00:00:24 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 776423 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 776424 0 70 2012 ? 00:00:02 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 776425 0 70 2012 ? 00:00:16 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 776426 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 776438 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 781158 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 781159 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 781160 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 781161 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 781162 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 158596 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 158597 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 158598 0 70 2012 ? 00:00:00 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/servers/ControllerEdmDemoLoaderCache/conf xce 746324 222631 790396 0 70 Apr30 ? 00:00:05 icebox --Ice.Config=/data/xce/Edm/bin/../data/node_edm1/serv
