This one does work on my linux/bash system; not sure it will on yours as you don't mention details:
This one will print the backup process' CPU percentage every other second. Replace echo with what you need, e.g. if [ "$CPU" -ge 95 ]. If the process does not exist or disappear, so does the loop. Make sure you only grep the one backup process of interest, eventually you have to narrow down the grep pattern.
Just a quick message to say great work to Neo and any others who have helped with the upgrade - the layout, appearance and functionality of this forum ROCKS.
By far the best I have seen.
Excellent! (1 Reply)
I am new to the Unix.
Can someone tell me what is the difference between 'PS' command and 'PS -aux"?
Isn't 'PS' mean the current running process?
Isn't 'PS -aux' mean the current running process too?
If they are the same, how come 'PS -aux' always has a lot more listing than 'PS'?
Thanks, (4 Replies)
Hi I want to implement the nice command in the shell that I am building. I came to know that there is a corresponding nice() system call for the same. But since I will be forking different processes to run different commands typed on the command prompt, is there any way I can make a command... (2 Replies)
to get the list of file name with size
Example:
rwxrwxrwx 1 cm x 562KB Nov 6 19:22 a
rwxrwxrwx 1 cm x 562MB Nov 6 19:22 a
edit by bakunin: Please view this code tag video for how to use code tags when posting code and data. (5 Replies)
Hi,
Can someone tell me what the difference is between ps -ef and ps aux. I was under the assumption that both commands would list ALL processes currently running on the system.
But on my server I find the following:
# ps
-ef | wc -l
519
# ps aux | wc -l
571
What... (1 Reply)
Hi,
I have the following output :
root 9296 81.7 0.2 1115328 20856 ? Sl 14:38 1:00 /opt/h264rtptranscoder.bin --videoPort=14500 --audioPort=14501
--serverPort=14500 --framesPerSecond=50 --profilesPath=/opt/transcodingProfiles
I would like to have the following output :
... (6 Replies)
Requirement is to monitor cpu usage /process for a user given time and record the output. topas,topasout,topasrec,tprof not seems to be working for me. so what i am looking for is to run below command continously till the time limit given by the user who runs the script.since below command is a one... (6 Replies)
Please do not post a technical question in the @How to contact....' forum. I have moved this for you.
Hello Everyone,
Please help me on this,
Requirement here is to check whether the process is running using the process id.
For the below scenario, I m trying to grep 1750 process id to... (3 Replies)
Discussion started by: Hari A
3 Replies
LEARN ABOUT LINUX
ionice
ionice(1) General Commands Manual ionice(1)NAME
ionice - get/set program io scheduling class and priority
SYNOPSIS
ionice [[-c class] [-n classdata] [-t]] -p PID [PID]...
ionice [-c class] [-n classdata] [-t] COMMAND [ARG]...
DESCRIPTION
This program sets or gets the io scheduling class and priority for a program. If no arguments or just -p is given, ionice will query the
current io scheduling class and priority for that process.
As of this writing, a process can be in one of three scheduling classes:
Idle A program running with idle io priority will only get disk time when no other program has asked for disk io for a defined grace
period. The impact of idle io processes on normal system activity should be zero. This scheduling class does not take a priority
argument. Presently, this scheduling class is permitted for an ordinary user (since kernel 2.6.25).
Best effort
This is the effective scheduling class for any process that has not asked for a specific io priority. This class takes a priority
argument from 0-7, with lower number being higher priority. Programs running at the same best effort priority are served in a round-
robin fashion.
Note that before kernel 2.6.26 a process that has not asked for an io priority formally uses "none" as scheduling class, but the io
scheduler will treat such processes as if it were in the best effort class. The priority within the best effort class will be dynam-
ically derived from the cpu nice level of the process: io_priority = (cpu_nice + 20) / 5.
For kernels after 2.6.26 with CFQ io scheduler a process that has not asked for an io priority inherits CPU scheduling class. The
io priority is derived from the cpu nice level of the process (same as before kernel 2.6.26).
Real time
The RT scheduling class is given first access to the disk, regardless of what else is going on in the system. Thus the RT class
needs to be used with some care, as it can starve other processes. As with the best effort class, 8 priority levels are defined
denoting how big a time slice a given process will receive on each scheduling window. This scheduling class is not permitted for an
ordinary (i.e., non-root) user.
OPTIONS -c class
The scheduling class. 0 for none, 1 for real time, 2 for best-effort, 3 for idle.
-n classdata
The scheduling class data. This defines the class data, if the class accepts an argument. For real time and best-effort, 0-7 is
valid data.
-p pid Pass in process PID(s) to view or change already running processes. If this argument is not given, ionice will run the listed pro-
gram with the given parameters.
-t Ignore failure to set requested priority. If COMMAND or PID(s) is specified, run it even in case it was not possible to set desired
scheduling priority, what can happen due to insufficient privileges or old kernel version.
EXAMPLES
# ionice -c 3 -p 89
Sets process with PID 89 as an idle io process.
# ionice -c 2 -n 0 bash
Runs 'bash' as a best-effort program with highest priority.
# ionice -p 89 91
Prints the class and priority of the processes with PID 89 and 91.
NOTES
Linux supports io scheduling priorities and classes since 2.6.13 with the CFQ io scheduler.
AUTHORS
Jens Axboe <jens@axboe.dk>
AVAILABILITY
The ionice command is part of the util-linux package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux/.
ionice August 2005 ionice(1)