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yther
Apprentice
Joined: 25 Oct 2002
Posts: 151
Location: Charlotte, NC (USA)
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 Posted: Thu Apr 30, 2009 5:12 am Post subject: How to allow myself negative nice? |
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OK, I am trying to allow myself (i.e., me as a normal user and absolutely not as root) to start a certain task at a negative nice level. I have added my user to /etc/security/limits.conf:
| Code: | | rassilon hard nice -15 |
However, when I try to start something with a lower nice value than 0, I am not allowed. I tried the same with "soft" instead, and got the same result.
| Code: | rassilon@miharu ~ $ nice -n -1 xclock
nice: cannot set niceness: Permission denied |
I want to be able to do this so I can put the "nice" bit into a menu and not have to run "renice" as root after starting the processes.
Obviously I am missing something, but what? I don't want to resort to changing the system's setup, or adding my user to the "root" group, unless there's no other way. I also do not want to use "sudo" to run the process, because then the files it touches will wind up owned by root, which is a hassle.
Thanks for any clues! Even "RTFM" would help if you mention which M to FR.  |
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ToeiRei
Veteran
Joined: 03 Jan 2005
Posts: 1191
Location: Austria
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| Posted: Thu Apr 30, 2009 6:45 am Post subject: |
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What about a sudo wrapper?
Rei
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yther
Apprentice
Joined: 25 Oct 2002
Posts: 151
Location: Charlotte, NC (USA)
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| Posted: Thu Apr 30, 2009 1:44 pm Post subject: |
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| ToeiRei wrote: | | What about a sudo wrapper? |
I'm not sure I understand. Sudo, as I stated in my first post, causes the process to start as root. Using sudo was the first thing I considered, but then rejected; I want to avoid that because it will change the ownership of my files.
So, I could use a wrapper such as kdesu, but then I get the process running as root, and files it creates will be owned by root. That's not good. Do I misunderstand your suggestion? |
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albright
Advocate
Joined: 16 Nov 2003
Posts: 2588
Location: Near Toronto
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| Posted: Thu Apr 30, 2009 1:58 pm Post subject: |
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it's not elegant but can you start the process and then
sudo renice it ?
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desultory
Bodhisattva
Joined: 04 Nov 2005
Posts: 9410
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| Posted: Fri May 01, 2009 2:50 am Post subject: |
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| yther wrote: | | I'm not sure I understand. Sudo, as I stated in my first post, causes the process to start as root. |
It goes both ways, though in the majority of cases it does not need to as there is a lazier way. |
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yther
Apprentice
Joined: 25 Oct 2002
Posts: 151
Location: Charlotte, NC (USA)
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| Posted: Fri May 01, 2009 4:02 pm Post subject: |
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| desultory wrote: | | yther wrote: | | I'm not sure I understand. Sudo, as I stated in my first post, causes the process to start as root. |
It goes both ways, though in the majority of cases it does not need to as there is a lazier way. |
What do you mean by "it goes both ways"?  I seem to be unusually stupid this week...
Anyway, I'm still looking for a better solution, but I think I can do something like this little (untested) script:
| Code: | #!/bin/bash
VMWARE_VARIABLES_BLAHBLAH="stuff" vmplayer $HOME/VMs/vm.vmx
kdesu renice -15 `pidof vmplayer` |
That won't work predictably if there are multiple instances of vmplayer, but I don't run multiple VMs yet, so it should do for the moment.
I'm still amazed that there seems to be no way to simply allow myself (as a user) the ability to give my own processes a high priority. I need to spend some time doing an intense search, I guess, because the setting in "limits.conf" seems to have no effect, and I don't know why. |
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neysx
Retired Dev
Joined: 27 Jan 2003
Posts: 795
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| Posted: Fri May 01, 2009 4:06 pm Post subject: |
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| sudo nice -n -10 su username -c command |
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yther
Apprentice
Joined: 25 Oct 2002
Posts: 151
Location: Charlotte, NC (USA)
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| Posted: Sat May 02, 2009 12:45 am Post subject: |
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| neysx wrote: | | sudo nice -n -10 su username -c command |
Ah, I finally see the light! Thank you, and sorry for not seeing that possibility myself.  |
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sswam
n00b
Joined: 17 Jun 2011
Posts: 1
Location: Melbourne, Australia
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| Posted: Fri Jun 17, 2011 4:19 pm Post subject: Re: How to allow myself negative nice? |
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To answer the original question, now 2 years old!
| Code: | | rassilon - nice -15 |
I.e, write a dash not hard nor soft.
This works ok for me, and it can indeed be very useful. |
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numlock
n00b
Joined: 17 Sep 2004
Posts: 58
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| Posted: Tue Jun 07, 2016 8:05 pm Post subject: Re: How to allow myself negative nice? |
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| sswam wrote: | To answer the original question, now 2 years old!
| Code: | | rassilon - nice -15 |
I.e, write a dash not hard nor soft.
This works ok for me, and it can indeed be very useful. |
Awesome, thank you!
Just a note: the "max" value for nice is -20. |
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