Cameron, Very nice explanation of how do'able this is. Thank you.
R,
-Joe
From: Cameron Simpson <cs@xxxxxxxxxx>
To: Community support for Fedora users <users@xxxxxxxxxxxxxxxxxxxxxxx>
Sent: Thursday, May 3, 2012 6:36 PM
Subject: Re: Can you stack nice and ionice?
On 03May2012 16:08, Richard Shaw <hobbes1069@xxxxxxxxx> wrote:
| I have a CPU and IO intensive task I'd like to tame a bit but I'm not
| sure if this can be done in a one-liner. Since both nice and ionice
| are designed to run only a single command I'm not sure if the
| following would work:
|
| ionice -c3 nice -n19 <process>
|
| It looks like to me that ionice is going to run nice who's going to
| run the task.
Should work just fine. ionice _is_ running just one command:
nice -n19 <process>
Note that "<process>" will need to be a command, and not something like
"-p pid".
| I tried examining the first example using pstree but I don't think the
| processes "stacked".
They will exec, so no parent/child stuff. ionice will set the ionice
setting then exec the next command. Likewise nice.
There are plenty of little commands with this behaviour: make a setting
change and then execute comething with the new setting: env etc. I've
got a bunch of shell scripts with similar usage patterns as well. These
"prefix" commands make a lot of simple things very easy to express in
scripts.
Cheers,
--
Cameron Simpson <cs@xxxxxxxxxx> DoD#743
http://www.cskk.ezoshosting.com/cs/
Like dogs and muggers, transistors can sense fear. - Norman Yarvin
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