This can be a terrible idea, but this is how you do it.
Logon as root. Then try to set your process to a very high priority, thus avoiding the scheduler.
One way is -- Use the nice command as a workaround. Also: in Linux there are ways to create realtime priority classes for processes. To determine the highest realtime priority you can set programmatically, make use of the sched_get_priority_max function. Also be aware: MAX_USER_RT_PRIO is the priority user space should ever run in. Period. See sched.h
If timing is such a big deal you should consider synchronization primitives: mutexes, semaphores, locking.
If your code is running as root you can use the nice() syscall to accomplish priority changes as well.
Note: If your process is having a problem it can bring the whole system to its knees.
Since you do not seem to know about process priority I would suggest that other mechanisms be tried first, before nice(). Meaning: Because you are asking this question, it would appear you may not be experienced enough to do realtime coding.
:cool:
I need to execute a shell script to do the following:
cat a file
run two back ground processes using the first two values from the file
wait till those background processes finish
run two more background processes using the next two values from the file
wait till those background... (1 Reply)
o
hola..
Tengo un script que se ejecuta bajo una tarea del CronJOb del unix, tengo la version 11 de unix, mi script tiene un ciclo que lee unos archivos .txt luego cada uno de esos archivos debe pasar por un procedimiento almacenado el cual lo tengo almacenado en mi base de datos oracle 10g,... (4 Replies)
Hi,
I am trying to run a simple UNIX command after i successfully executed SFTP command as shown below.
-----------------------------------------
echo 'Step-1'
sftp -vvv -b path
exit
echo 'Step-2'
------------------------------------------
In above script it executes from the 1st... (3 Replies)
Hello all,
I would be happy if any one could help me with a shell script that would determine all the processes running on a Unix server and post a mail if any of the process is not running or aborted.
Thanks in advance
Regards,
pradeep kulkarni.
:mad: (13 Replies)
Hi Experts, we do have a shell script for Unix Solaris, which will kill all the process manullay, it used to work in my previous env, but now it is throwing this error.. could some one please help me to resolve it
This is how we execute the script (and this is the requirement) ... (2 Replies)
Hi,
I was Googling to get info "How OS loads process into its memory to execute?" i mean when i execute ./<exename> , How OS exectes it?
It will be better if i tell my intention,
In my $LOGNAME saveral process are running, among all of these two process are my target process. Basically I... (1 Reply)
get email notification from from system when a process from XXXX user takes longer than 15 min run.Let me know the time estimation for the same.
hi ,any one please tell me , how to write a script to get email notification from system when a process from as mentioned above a xxxx user takes... (1 Reply)
I need to develop a process/daemon which will constantly monitor a file for new entry and execute a command.
for eg, there is a file /var/log/inotify.log
When a new entry like below gets appeneded to this file, execute the command as follows.
/home/user/public_html/bad.php|CREATE
... (2 Replies)
I am writing a script to kick off a process to gather logs on multiple nodes in parallel using "&". These processes create individual log files. Which I would like to filter and convert in CSV format after they are complete. I am facing following issues:
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Team,
I have multiple batchjobs running in VM, if I do ps -ef |grep java or tomcat I am getting multiple process list.
How do I get my exact tomcat process running and that is unique? via shell script? (4 Replies)
Discussion started by: Ghanshyam Ratho
4 Replies
LEARN ABOUT X11R4
renice
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)