How can I adjust the name of a process I run?

Question

I have a rack/ruby application on a server. I run it as follows:

  nohup rackup -o 0.0.0.0 -p 1234 &

In the output of "top" command it appears as simply "ruby"

PID   USERNAME    THR PRI NICE   SIZE    RES STATE    TIME    WCPU COMMAND

98421  my_user123       3  20    0   140M 29576K select   0:29   0.01% ruby

How can I adjust its name in the "top"? What if I run 5 such web apps, how would I distinguish which is which if they're all "ruby"?

`What if I run 5 such web apps, how would I distinguish which is which if they're all "ruby"?` - Well... they'd all have a different PID. — joeqwerty, Dec 07 '17 at 03:41

score 0 · Answer 1 · answered Dec 07 '17 at 04:47

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It's not the process name you need to adjust, but your tool.

Press c while top is running, or just start it with -c to see full command lines.

For example, without -c:

12329 error     20   0  618748 202472  19424 S   0.0 20.0   7:49.32 ruby

And with -c:

12329 error     20   0  618748 202472  19424 S   0.0 20.0   7:49.32 ruby /home/error/.rvm/gems/ruby-2.2.7@app/bin/thin start -a ::1 -p 8008

answered Dec 07 '17 at 04:47

Michael Hampton

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on linux - yes, that's good. on freebsd - "command not understood". how to do that? – Kakki Dec 07 '17 at 05:19
on linux - yes, that's good. on freebsd - "command not understood". how to do that? – Kakki Dec 07 '17 at 07:58
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On a `FreeBSD` just press `a` in the `top`. Or better run `ps auxwww | grep ruby` – Kondybas Dec 07 '17 at 09:16

score 0 · Answer 2 · answered Dec 07 '17 at 07:40

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On systems where it is supported, you can change the name of a process in ruby by assigning to $0 or by using Process.setproctitle (ruby 2.1+).

answered Dec 07 '17 at 07:40

hobbs

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`by assigning to $0` -- how? – Kakki Dec 07 '17 at 07:58
@Kakki `$0 = "something"` – hobbs Dec 07 '17 at 08:00
that doesn't work `$0 = "something" nohup rackup -o 0.0.0.0 -p 1234 &`. show the full command – Kakki Dec 09 '17 at 07:07
@Kakki ... in the program, of course, not in the shell. – hobbs Dec 09 '17 at 07:30
thx, I'll try to – Kakki Dec 09 '17 at 08:00

How can I adjust the name of a process I run?

2 Answers2