03-06-2013
In a more perfect world, the dispatcher would get the CPU to programs that do not hog it and that do i/o on an expedited basis. I remember amazing operators who were copying tape with the difference if I made the job APRIOR, which meant real time. The drive went from "bup bup bup" to "ZZZZZZZZ", and nobody suffered, because it was i/o bound. Programs like that need to take their 1% off the top, which is no harm to the 99%, especially when there is still idle time. Writing dispatches is a big deal some places. One sysadmin refused to kill a looping pg for me, because he said their very custom dispatcher ensured that the CPU it took was off the bottom, so they had a policy to just wait for the periodic reboot.
9 More Discussions You Might Find Interesting
1. Linux
Hello!
How do make the limits.conf parameters work for a normal user. Ive changed
both the hard and soft parameter for the specific user. It used to be 4096 and i changed it to 16384. But when i use the ulimit -n, all i got is permissen denied.
Witch i can understand. But my question is? how... (1 Reply)
Discussion started by: dozy
1 Replies
2. UNIX for Dummies Questions & Answers
I have line in this file that says:
username - maxlogins 1
and user can login 2 times instad of one.
does enybody know why? and how can I fix that? (2 Replies)
Discussion started by: shooroop
2 Replies
3. HP-UX
Hi folks,
Hope you can help me. I have a process that is currently running at nice 20 and need it to run faster (-10?). How do I change the process using nice? I have the process number and thought it would be along the lines of;
nice -10 process_id
but it doesn't seem to like that. (1 Reply)
Discussion started by: gshuttleworth
1 Replies
4. UNIX for Advanced & Expert Users
HI,
To restrict the number of files and number of processes used the user we use the following configuration in the file /etc/security/limits.conf.
oracle soft nofile 65572
oracle hard nofile 65572
oracle soft noproc 16384
oracle soft noproc 16384
My question is what do the 'soft' and... (1 Reply)
Discussion started by: praveen_b744
1 Replies
5. Solaris
Hi,
How can we set per user core file size, etc in solaris, i.e. I want solaris counterpart/equivalent of linux /etc/security/limits.conf.
TIA (0 Replies)
Discussion started by: slash_blog
0 Replies
6. Red Hat
Hello all,
I'm running Oracle 10.2 on RHEL5. Current value of ulimit -n is set to a low value of 1024. I need to increase it to 65536 using the following procedure.
cat >> /etc/security/limits.conf <<EOF
oracle soft nproc 2047
oracle hard nproc 16384
oracle soft nofile 1024
oracle hard... (3 Replies)
Discussion started by: luft
3 Replies
7. Red Hat
i want to set limits in /etc/security/limits.conf.My os is rhel 5.2.
It was giving continuous messages in in /var/log/secure like :
continuously.
I have changed values of priority and nice to "0" from unlimited and messages are not comming. But i want to know what is the ideal/maximum... (3 Replies)
Discussion started by: pankajd
3 Replies
8. Shell Programming and Scripting
Hello,
I am just starting with shell scripting, as everyone will soon see from my question. What I'm trying to do is call the Nice command to set the script process priority from /bin/ksh. The difference is I'm running it not directly through the shell, but through Bigfix (very similar to... (3 Replies)
Discussion started by: solly119
3 Replies
9. UNIX for Dummies Questions & Answers
OS version : RHEL 6.5
Below is an excerpt from /etc/security/limits.conf file for OS User named appusr in our server
appusr soft nproc 2047
appusr hard nproc 16384
What will happen if appusr has already spawned 2047 processes and wants to spawn 2048th process ?
I just want to know... (3 Replies)
Discussion started by: kraljic
3 Replies
RENICE(1) User Commands RENICE(1)
NAME
renice - alter priority of running processes
SYNOPSIS
renice [-n] priority [-g|-p|-u] identifier...
DESCRIPTION
renice alters the scheduling priority of one or more running processes. The first argument is the priority value to be used. The other
arguments are interpreted as process IDs (by default), process group IDs, user IDs, or user names. renice'ing a process group causes all
processes in the process group to have their scheduling priority altered. renice'ing a user causes all processes owned by the user to have
their scheduling priority altered.
OPTIONS
-n, --priority priority
Specify the scheduling priority to be used for the process, process group, or user. Use of the option -n or --priority is optional,
but when used it must be the first argument.
-g, --pgrp
Interpret the succeeding arguments as process group IDs.
-p, --pid
Interpret the succeeding arguments as process IDs (the default).
-u, --user
Interpret the succeeding arguments as usernames or UIDs.
-V, --version
Display version information and exit.
-h, --help
Display help text and exit.
EXAMPLES
The following command would change the priority of the processes with PIDs 987 and 32, plus all processes owned by the users daemon and
root:
renice +1 987 -u daemon root -p 32
NOTES
Users other than the superuser may only alter the priority of processes they own. Furthermore, an unprivileged user can only increase the
``nice value'' (i.e., choose a lower priority) and such changes are irreversible unless (since Linux 2.6.12) the user has a suitable
``nice'' resource limit (see ulimit(1) and getrlimit(2)).
The superuser may alter the priority of any process and set the priority to any value in the range -20 to 19. Useful priorities are: 19
(the affected processes will run only when nothing else in the system wants to), 0 (the ``base'' scheduling priority), anything negative
(to make things go very fast).
FILES
/etc/passwd
to map user names to user IDs
SEE ALSO
nice(1), getpriority(2), setpriority(2), credentials(7), sched(7)
HISTORY
The renice command appeared in 4.0BSD.
AVAILABILITY
The renice command is part of the util-linux package and is available from Linux Kernel Archive <https://www.kernel.org/pub/linux/utils
/util-linux/>.
util-linux July 2014 RENICE(1)