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Full Discussion: Terminal command
Operating Systems Linux Terminal command Post 303017625 by RudiC on Saturday 19th of May 2018 05:45:18 AM
Old 05-19-2018
No need to become mocking and thus violate forum rules. Bakunin certainly was not the only one to stumble over your initial post and rightly asked for a better specification. From then on, the discussion derailed to some extent.
Let's get back to a serious, factual, objective discussion.

It's usual practice in these fora to explain a problem to a certain not too superficial extent to keep people from guessing. Adding one's own attempts (and, even better, failures!) shows what has been tried and can help further in getting to an satisfying answer.

Were that too much effort for some requestor, what effort would they expect from the people in here dealing with their problem?

Last edited by RudiC; 05-19-2018 at 12:13 PM..
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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 privilegies 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-ng package and is available from ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/. ionice August 2005 ionice(1)
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