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ewg
n00b
Joined: 02 Aug 2005
Posts: 28
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 Posted: Mon Aug 08, 2005 6:59 pm Post subject: how to set nice value of at jobs? |
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Hi,
I use at frequently to execute commands later. By default, these jobs are executed with a nice value of 2. How can I make atd give them a nice value of 0?
Thanks,
Eckhart |
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ekutay
l33t
Joined: 30 Mar 2005
Posts: 636
Location: Berlin
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| Posted: Mon Aug 08, 2005 7:53 pm Post subject: |
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| Code: | | nice -n0 yourProgram |
for renice a running program, know the pid and use for negative nice values, you must be root!
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ewg
n00b
Joined: 02 Aug 2005
Posts: 28
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| Posted: Mon Aug 08, 2005 8:21 pm Post subject: |
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Yes, I know, but this is no solution. I want to specify the initial nice values of jobs started by atd.
Preceding scheduled commands with nice does not work, since atd overrides this. So, how do I make atd start commands with nice 0? |
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limn
l33t
Joined: 13 May 2005
Posts: 997
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| Posted: Mon Aug 08, 2005 8:48 pm Post subject: |
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You would have to modify the code. It is written to have a minimum value of 2.
Perhaps at's history as a security problem is the reason for this. |
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ekutay
l33t
Joined: 30 Mar 2005
Posts: 636
Location: Berlin
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| Posted: Mon Aug 08, 2005 10:15 pm Post subject: |
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and if you renice afterwards? does at checks its current niceness?
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ewg
n00b
Joined: 02 Aug 2005
Posts: 28
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| Posted: Mon Aug 08, 2005 10:19 pm Post subject: |
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| renice works. However, I use at because I am not at the computer when the job is started. So I can't renice it. |
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ekutay
l33t
Joined: 30 Mar 2005
Posts: 636
Location: Berlin
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| Posted: Mon Aug 08, 2005 10:58 pm Post subject: |
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you could add a cron job, renicing all at jobs. 
| Code: | | for i in $( ps -C atd --format pid --no-header ) ; do renice -2 $i; done |
maybe a patch as suggested or using cron instead generally is better if the priority is really important.
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gentsquash
l33t
Joined: 03 Nov 2004
Posts: 753
Location: Still a Gentoo beginner.
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| Posted: Tue Aug 09, 2005 8:04 pm Post subject: |
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(To O.P.) Is it good enough to put the nice within each line of
the at cmd? I.e, when at prompts for a cmd, type, e.g,
| Code: | % at 2:48
warning: commands will be executed using /bin/sh
at> nice -n 0 emerge kde-meta
at> nice -n 0 /usr/bin/updatedb
at> nice -n 0 /usr/sbin/eupdatedb |
[Alternatively, I suppose one could find where at stores its cmd
files, and then one could run a script that puts a "nice -n 0" in
front of each line. This doesn't sound robust to me, however.]
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Prof. Jonathan LF King, Mathematics dept., University of Florida |
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maacruz
n00b
Joined: 05 Dec 2010
Posts: 1
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| Posted: Sun Dec 05, 2010 2:35 pm Post subject: [SOLVED] how to set nice value of at jobs? |
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I had the same problem so I resorted to creating a new set of high niceness queues, from 0 (0 niceness) to 9 (-18 niceness).
Apply this patch to get the same:
| Code: |
diff -ruN at-3.1.8/at.c at-3.1.8-1/at.c
--- at-3.1.8/at.c 2002-01-18 05:15:27.000000000 +0100
+++ at-3.1.8-1/at.c 2010-12-05 14:39:17.000000000 +0100
@@ -758,7 +758,7 @@
usage();
atqueue = queue = *optarg;
- if (!(islower(queue) || isupper(queue)) & (queue != '='))
+ if (!(islower(queue) || isupper(queue) || isdigit(queue)) & (queue != '='))
usage();
queue_set = 1;
diff -ruN at-3.1.8/atd.c at-3.1.8-1/atd.c
--- at-3.1.8/atd.c 2002-01-18 05:15:27.000000000 +0100
+++ at-3.1.8-1/atd.c 2010-12-05 14:46:03.000000000 +0100
@@ -383,7 +383,10 @@
PRIV_START
- nice((tolower((int) queue) - 'a' + 1) * 2);
+ if (isdigit(queue))
+ nice(('0' - (int) queue) * 2);
+ else
+ nice((tolower((int) queue) - 'a' + 1) * 2);
if (initgroups(pentry->pw_name, pentry->pw_gid))
perr("Cannot delete saved userids");
@@ -546,7 +549,7 @@
/* Skip any other file types which may have been invented in
* the meantime.
*/
- if (!(isupper(queue) || islower(queue))) {
+ if (!(isupper(queue) || islower(queue) || isdigit(queue))) {
continue;
}
/* Is the file already locked?
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Ant P.
Watchman
Joined: 18 Apr 2009
Posts: 6920
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| Posted: Mon Dec 06, 2010 6:04 pm Post subject: |
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| Just curious: why do these need to be nice=0? |
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