Are tid and tgid always the same as pid in the output of ps?
In manpage of ps
tid TID the unique number representing a dispatchable
entity (alias lwp, spid). This value may also
appear as: a process ID (pid); a process group
ID (pgrp); a session ID for the session leader
(sid); a thread group ID for the thread group
leader (tgid); and a tty process group ID for
the process group leader (tpgid).
tgid TGID a number representing the thread group to which
a task belongs (alias pid). It is the process
ID of the thread group leader.
In Ubuntu, tid and tgid seem always the same as pid, for both user processes, and kernel threads (I run ps -o pid,tid,tgid,cmd) Is it true in Linux, and why?
Is it true in other Unix such as System V or BSD?
Thanks.
linux ps thread system-v
edited 1 hour ago
ctrl-alt-delor
10.8k41957
asked 4 hours ago
Tim
25.9k74246454
add a comment |
In manpage of ps
tid TID the unique number representing a dispatchable
entity (alias lwp, spid). This value may also
appear as: a process ID (pid); a process group
ID (pgrp); a session ID for the session leader
(sid); a thread group ID for the thread group
leader (tgid); and a tty process group ID for
the process group leader (tpgid).
tgid TGID a number representing the thread group to which
a task belongs (alias pid). It is the process
ID of the thread group leader.
In Ubuntu, tid and tgid seem always the same as pid, for both user processes, and kernel threads (I run ps -o pid,tid,tgid,cmd) Is it true in Linux, and why?
Is it true in other Unix such as System V or BSD?
Thanks.
linux ps thread system-v
edited 1 hour ago
ctrl-alt-delor
10.8k41957
asked 4 hours ago
Tim
25.9k74246454
In Linux it's true, tid is the identity of thread, tgid is the identity of process, or you may call it pid.
– 炸鱼薯条德里克
4 hours ago
add a comment |
In manpage of ps
tid TID the unique number representing a dispatchable
entity (alias lwp, spid). This value may also
appear as: a process ID (pid); a process group
ID (pgrp); a session ID for the session leader
(sid); a thread group ID for the thread group
leader (tgid); and a tty process group ID for
the process group leader (tpgid).
tgid TGID a number representing the thread group to which
a task belongs (alias pid). It is the process
ID of the thread group leader.
In Ubuntu, tid and tgid seem always the same as pid, for both user processes, and kernel threads (I run ps -o pid,tid,tgid,cmd) Is it true in Linux, and why?
Is it true in other Unix such as System V or BSD?
Thanks.
linux ps thread system-v
edited 1 hour ago
ctrl-alt-delor
10.8k41957
asked 4 hours ago
Tim
25.9k74246454
In manpage of ps
tid TID the unique number representing a dispatchable
entity (alias lwp, spid). This value may also
appear as: a process ID (pid); a process group
ID (pgrp); a session ID for the session leader
(sid); a thread group ID for the thread group
leader (tgid); and a tty process group ID for
the process group leader (tpgid).
tgid TGID a number representing the thread group to which
a task belongs (alias pid). It is the process
ID of the thread group leader.
In Ubuntu, tid and tgid seem always the same as pid, for both user processes, and kernel threads (I run ps -o pid,tid,tgid,cmd) Is it true in Linux, and why?
Is it true in other Unix such as System V or BSD?
Thanks.
linux ps thread system-v
linux ps thread system-v
edited 1 hour ago
ctrl-alt-delor
10.8k41957
asked 4 hours ago
Tim
25.9k74246454
edited 1 hour ago
ctrl-alt-delor
10.8k41957
asked 4 hours ago
Tim
25.9k74246454
edited 1 hour ago
ctrl-alt-delor
10.8k41957
edited 1 hour ago
ctrl-alt-delor
10.8k41957
edited 1 hour ago
ctrl-alt-delor
10.8k41957
10.8k41957
asked 4 hours ago
Tim
25.9k74246454
asked 4 hours ago
Tim
25.9k74246454
asked 4 hours ago
Tim
25.9k74246454
25.9k74246454
In Linux it's true, tid is the identity of thread, tgid is the identity of process, or you may call it pid.
– 炸鱼薯条德里克
4 hours ago
add a comment |
In Linux it's true, tid is the identity of thread, tgid is the identity of process, or you may call it pid.
– 炸鱼薯条德里克
4 hours ago
In Linux it's true, tid is the identity of thread, tgid is the identity of process, or you may call it pid.
– 炸鱼薯条德里克
4 hours ago
In Linux it's true, tid is the identity of thread, tgid is the identity of process, or you may call it pid.
– 炸鱼薯条德里克
4 hours ago
add a comment |
1 Answer
1
active
oldest
votes
You need to task ps to show thread information; otherwise it only lists processes:
ps -eL -o pid,tid,comm | awk '$1 != $2'
will show all the threads, apart from each process’ main thread, i.e. entries in the process table where pid and tid are different. The significant option is -L: without that, ps will only list entries where pid and tid are identical.
On FreeBSD, the equivalent option is -H. I haven’t checked other BSDs, or System V.
answered 4 hours ago
Stephen Kitt
164k24365444
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
4 hours ago
1
@炸鱼薯条德里克awk '$1 != $2'should give a strong hint, but I’ve clarified that part.
– Stephen Kitt
4 hours ago
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
3 hours ago
1
@Tim: Linux ps doesn't use a dash, but the actual FreeBSD ps accepts both kinds (because it doesn't have to distinguish: all options in FreeBSD ps are "BSD style" options) and the manual page actually documents them with a dash.
– grawity
2 hours ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
You need to task ps to show thread information; otherwise it only lists processes:
ps -eL -o pid,tid,comm | awk '$1 != $2'
will show all the threads, apart from each process’ main thread, i.e. entries in the process table where pid and tid are different. The significant option is -L: without that, ps will only list entries where pid and tid are identical.
On FreeBSD, the equivalent option is -H. I haven’t checked other BSDs, or System V.
answered 4 hours ago
Stephen Kitt
164k24365444
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
4 hours ago
1
@炸鱼薯条德里克awk '$1 != $2'should give a strong hint, but I’ve clarified that part.
– Stephen Kitt
4 hours ago
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
3 hours ago
1
@Tim: Linux ps doesn't use a dash, but the actual FreeBSD ps accepts both kinds (because it doesn't have to distinguish: all options in FreeBSD ps are "BSD style" options) and the manual page actually documents them with a dash.
– grawity
2 hours ago
add a comment |
You need to task ps to show thread information; otherwise it only lists processes:
ps -eL -o pid,tid,comm | awk '$1 != $2'
will show all the threads, apart from each process’ main thread, i.e. entries in the process table where pid and tid are different. The significant option is -L: without that, ps will only list entries where pid and tid are identical.
On FreeBSD, the equivalent option is -H. I haven’t checked other BSDs, or System V.
answered 4 hours ago
Stephen Kitt
164k24365444
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
4 hours ago
1
@炸鱼薯条德里克awk '$1 != $2'should give a strong hint, but I’ve clarified that part.
– Stephen Kitt
4 hours ago
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
3 hours ago
1
@Tim: Linux ps doesn't use a dash, but the actual FreeBSD ps accepts both kinds (because it doesn't have to distinguish: all options in FreeBSD ps are "BSD style" options) and the manual page actually documents them with a dash.
– grawity
2 hours ago
add a comment |
You need to task ps to show thread information; otherwise it only lists processes:
ps -eL -o pid,tid,comm | awk '$1 != $2'
will show all the threads, apart from each process’ main thread, i.e. entries in the process table where pid and tid are different. The significant option is -L: without that, ps will only list entries where pid and tid are identical.
On FreeBSD, the equivalent option is -H. I haven’t checked other BSDs, or System V.
answered 4 hours ago
Stephen Kitt
164k24365444
You need to task ps to show thread information; otherwise it only lists processes:
ps -eL -o pid,tid,comm | awk '$1 != $2'
will show all the threads, apart from each process’ main thread, i.e. entries in the process table where pid and tid are different. The significant option is -L: without that, ps will only list entries where pid and tid are identical.
On FreeBSD, the equivalent option is -H. I haven’t checked other BSDs, or System V.
answered 4 hours ago
Stephen Kitt
164k24365444
edited 4 hours ago
answered 4 hours ago
Stephen Kitt
164k24365444
answered 4 hours ago
Stephen Kitt
164k24365444
answered 4 hours ago
Stephen Kitt
164k24365444
164k24365444
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
4 hours ago
1
@炸鱼薯条德里克awk '$1 != $2'should give a strong hint, but I’ve clarified that part.
– Stephen Kitt
4 hours ago
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
3 hours ago
1
@Tim: Linux ps doesn't use a dash, but the actual FreeBSD ps accepts both kinds (because it doesn't have to distinguish: all options in FreeBSD ps are "BSD style" options) and the manual page actually documents them with a dash.
– grawity
2 hours ago
add a comment |
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
4 hours ago
1
@炸鱼薯条德里克awk '$1 != $2'should give a strong hint, but I’ve clarified that part.
– Stephen Kitt
4 hours ago
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
3 hours ago
1
@Tim: Linux ps doesn't use a dash, but the actual FreeBSD ps accepts both kinds (because it doesn't have to distinguish: all options in FreeBSD ps are "BSD style" options) and the manual page actually documents them with a dash.
– grawity
2 hours ago
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
4 hours ago
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
4 hours ago
1
1
@炸鱼薯条德里克
awk '$1 != $2' should give a strong hint, but I’ve clarified that part.– Stephen Kitt
4 hours ago
@炸鱼薯条德里克
awk '$1 != $2' should give a strong hint, but I’ve clarified that part.– Stephen Kitt
4 hours ago
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
3 hours ago
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
3 hours ago
1
1
@Tim: Linux ps doesn't use a dash, but the actual FreeBSD ps accepts both kinds (because it doesn't have to distinguish: all options in FreeBSD ps are "BSD style" options) and the manual page actually documents them with a dash.
– grawity
2 hours ago
@Tim: Linux ps doesn't use a dash, but the actual FreeBSD ps accepts both kinds (because it doesn't have to distinguish: all options in FreeBSD ps are "BSD style" options) and the manual page actually documents them with a dash.
– grawity
2 hours ago
add a comment |
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In Linux it's true, tid is the identity of thread, tgid is the identity of process, or you may call it pid.
– 炸鱼薯条德里克
4 hours ago