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 Dec 29 '18 at 23:26
ctrl-alt-delor
10.9k41957
asked Dec 29 '18 at 20:35
Tim
26.1k74246455
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 Dec 29 '18 at 23:26
ctrl-alt-delor
10.9k41957
asked Dec 29 '18 at 20:35
Tim
26.1k74246455
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 Dec 29 '18 at 23:26
ctrl-alt-delor
10.9k41957
asked Dec 29 '18 at 20:35
Tim
26.1k74246455
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 Dec 29 '18 at 23:26
ctrl-alt-delor
10.9k41957
asked Dec 29 '18 at 20:35
Tim
26.1k74246455
edited Dec 29 '18 at 23:26
ctrl-alt-delor
10.9k41957
asked Dec 29 '18 at 20:35
Tim
26.1k74246455
edited Dec 29 '18 at 23:26
ctrl-alt-delor
10.9k41957
edited Dec 29 '18 at 23:26
ctrl-alt-delor
10.9k41957
edited Dec 29 '18 at 23:26
ctrl-alt-delor
10.9k41957
10.9k41957
asked Dec 29 '18 at 20:35
Tim
26.1k74246455
asked Dec 29 '18 at 20:35
Tim
26.1k74246455
asked Dec 29 '18 at 20:35
Tim
26.1k74246455
26.1k74246455
add a comment |
add a comment |
1 Answer
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active
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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 Dec 29 '18 at 20:46
Stephen Kitt
164k24365445
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
Dec 29 '18 at 20:52
1
@炸鱼薯条德里克awk '$1 != $2'should give a strong hint, but I’ve clarified that part.
– Stephen Kitt
Dec 29 '18 at 20:54
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
Dec 29 '18 at 21:45
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
Dec 29 '18 at 22:23
add a comment |
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1 Answer
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1 Answer
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active
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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 Dec 29 '18 at 20:46
Stephen Kitt
164k24365445
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
Dec 29 '18 at 20:52
1
@炸鱼薯条德里克awk '$1 != $2'should give a strong hint, but I’ve clarified that part.
– Stephen Kitt
Dec 29 '18 at 20:54
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
Dec 29 '18 at 21:45
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
Dec 29 '18 at 22:23
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 Dec 29 '18 at 20:46
Stephen Kitt
164k24365445
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
Dec 29 '18 at 20:52
1
@炸鱼薯条德里克awk '$1 != $2'should give a strong hint, but I’ve clarified that part.
– Stephen Kitt
Dec 29 '18 at 20:54
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
Dec 29 '18 at 21:45
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
Dec 29 '18 at 22:23
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 Dec 29 '18 at 20:46
Stephen Kitt
164k24365445
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 Dec 29 '18 at 20:46
Stephen Kitt
164k24365445
edited Dec 29 '18 at 20:53
answered Dec 29 '18 at 20:46
Stephen Kitt
164k24365445
answered Dec 29 '18 at 20:46
Stephen Kitt
164k24365445
answered Dec 29 '18 at 20:46
Stephen Kitt
164k24365445
164k24365445
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
Dec 29 '18 at 20:52
1
@炸鱼薯条德里克awk '$1 != $2'should give a strong hint, but I’ve clarified that part.
– Stephen Kitt
Dec 29 '18 at 20:54
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
Dec 29 '18 at 21:45
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
Dec 29 '18 at 22:23
add a comment |
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
Dec 29 '18 at 20:52
1
@炸鱼薯条德里克awk '$1 != $2'should give a strong hint, but I’ve clarified that part.
– Stephen Kitt
Dec 29 '18 at 20:54
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
Dec 29 '18 at 21:45
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
Dec 29 '18 at 22:23
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
Dec 29 '18 at 20:52
Hmm…this actually doesn't give an answer. Are they the same or not.
– 炸鱼薯条德里克
Dec 29 '18 at 20:52
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
Dec 29 '18 at 20:54
@炸鱼薯条德里克
awk '$1 != $2' should give a strong hint, but I’ve clarified that part.– Stephen Kitt
Dec 29 '18 at 20:54
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
Dec 29 '18 at 21:45
Thanks. "On FreeBSD, the equivalent option is -H". BSD style option doesn't have dash, does it?
– Tim
Dec 29 '18 at 21:45
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
Dec 29 '18 at 22:23
@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
Dec 29 '18 at 22:23
add a comment |
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