Questions tagged [nice]

A tool to change the priority of a process, giving it more or less CPU time.

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21 views

Is pulseaudio's default nice value (-11) actually ineffective due to autogroup?

The pulseaudio daemon runs with nice level -11 by default, via rtkit. However, I'm noticing choppy audio at times of high cpu load, and decreasing the nice value even further by setting high-priority ...
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25 views

What logs can I search to find out which processes used 'nice'?

I had a huge spike, in a plesk server, which brought it down due IO blocking. I see in the Plesk graphs there was a large increase in nice. I think thats normally cron jobs, im thinking also maybe a ...
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How to “soft-limit” CPU usage of a process

I have some processes running on Debian that I want to limit cpu of it usage in the "soft" manner. For example, if it eats more than 70% of a single core for more than 15 minutes, the CPU should be ...
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1answer
39 views

Is it possible to give a program priority without running as root?

I want to give a program I'm running in linux priority over other programs. I have sudo access and tried using sudo and the nice command. Specifically I ran a bash script file called RUN.sh that has ...
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Why a long type memory is reserved to nice value in the PCB in Linux?

All right, my question is not sufficiently specific. I've not mentioned the kernel version, the distribution and other potentially interesting things. But, anyway... these are important but doesn't ...
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1answer
175 views

How does the kernel assign the nice value to a process after it has been executed?

The Linux kernel implements two separate priority ranges. The first is the nice value, a number from –20 to +19 with a default of 0. Nice values are the standard priority range used in all Unix ...
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Understading Linux Process Priority (PR)

I have been trying to understand the linux nice and priority system, from my understanding a processes NI or nice level is essentially how friendly it is to other processes in terms of fair use of ...
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1answer
884 views

The `PRI` column of `ps` is inconsistent with man pages

I've been trying to understand how scheduling priorities work in linux. Here's what I've got: The kernel uses a priority value for each process which ranges from 0 to 139. The lower the number, the ...
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1answer
61 views

Process state characterization in output of ps command

The ps command shows the state of the process (e.g. Sleeping, Running etc) as also some additional info about. Among two of these additional options according to the man page are < high-...
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Why can't I `nice` a command group?

[fakename]$ nice yes a>/dev/null & [1] 26475 [fakename]$ ps -p 26475 -o nice,pid NI PID 10 26475 [fakename]$ nice { yes a>/dev/null; } & -bash: syntax error near unexpected token `}' ...
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`renice` seems to have no effect on CPU usage on Mac 10.13.4 [duplicate]

I am trying to test out the renice command on my Mac, it seems to be having no effect. This is how I'm testing it: I have a dual core CPU with hyper threading, so I run 6 instances of node -e 'while(...
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Nice does not affect utilization?

I am learning about the CFS in Linux. So i decided to see how the nice value can give a lower priority for background (i.e. nice) processes. I ran two CPU processes: taskset 01 python3 loop.py in two ...
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2answers
1k views

Should I set nice value lower for a user process to make it faster?

I recently learned about the nice value of a process. If I am running a user program, should I set the nice value as low as possible and would that make my process run faster?
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Automatic nice value?

I noticed that a process - here sort - has been scheduled with a higher nice value (2) - meaning lower priority. But what is the policy for deciding that? Also, it seems to be a rare event, as all ...
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1answer
352 views

Is there a guideline for setting nice values?

I would like to develop an app and want to come up a nice value for my daemon process. but I found no guideline for this. Some articles say that backup tasks should have higher nice value (which ...
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363 views

Linux / CFS: How do cgroupsv1 cpu.share / cgroupsv2 cpu.weight and nice process weights interact

I was wondering how cgroup cpu shares/weights (v1: cpu.shares or v2: cpu.weight) and the niceness value of a task do interact in Linux with the CFS (Completely Fair Scheduler). Both values have an ...
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1answer
544 views

Process Priority value is different in procfs

For example, let's examine the value of PRI of firefox with ps, and then see what is the value stored in procfs. $ ps -o pid,comm,pri,ni 7000 PID COMMAND PRI NI 7000 firefox 19 ...
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2answers
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Linux - Process get as much resources as possible but give out resources when other processes coming in

I need to run a process A as much resources as possible when the machine is free, but gives out CPU once there's high-priority processes are started. Any suggestions? Thanks!
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344 views

What is the nicest a Unix command can be?

For a quick benchmarking test, how can nice and ionice be combined to maximum effect, ie for a command to use as little resource as possible (without idling altogether)? (I think it's something like `...
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Does it make sense to combine chrt and nice?

I want a CPU-intensive process to have the lowest possible impact on other processes. I can use nice -19 for maximum niceness and chrt -i 0 to give the process a SCHED_IDLE priority. Which is more ...
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2answers
2k views

nice and ionice: which one should come first?

I need to run some long and heavy commands but at the same time I'd like to keep my desktop system responsive. Examples: btrfs deduplication, btrfs balance, etc. I don't mind if such commands take ...
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macOS: nice/renice not working — no actual effect on cputime?

Although I can see a "nice" value ("NI") via ps, it seems to have no effect on the actual cpu-time used by a process: PID %CPU PRI NI COMM 57081 77.6 12 10 cpu-chew 57080 77.1 12 0 cpu-chew ...
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1answer
1k views

renice doesn't work in macOS Sierra

I wanted set low priority to HandBrake in macOS. I tried to use renice command by pid, but it seems not working. (nice value stays 0) % ps ax -l | grep Hand 501 32255 1 0 46 0 3433240 ...
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2answers
418 views

Centos 7 - renice all threads created by a python script

I'm running Centos 7 and Python 3.6. I have a python script that uses multi-treading. I want to renice or change the niceness value for all of the treads the script spawns. At present, I am able ...
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1answer
310 views

How does one “nice” a PID via htop after the process has begun?

Let's say I'm running a multicore process. How do I "nice" this via htop after submission?
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1answer
1k views

What does “/bin/sh -c nice run-parts --report /etc/cron.daily” mean?

Today, when I logged in and checked the ps output, I noticed a few lines that were run automatically under the root. I grepped the relevant lines here: root 1126 0.0 0.0 2616 424 ? ...
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1answer
397 views

Linux nice command

When I try to assign the nice value to a program for example: nice -n -7 waffles It will not allow me to run the program in the background as well with the bg command. Is there a way I can pipe ...
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2answers
893 views

Assign a higher priority to a specific process by default

I would like to configure my desktop Linux system so that whenever I start running a specific programme (run that processes of this programme) the respective process gets assigned a high priority. How ...
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1answer
899 views

Nice: *Low* priority using *more* CPU

(Ubuntu 14.04 server, 8 cores, 16GB RAM) When running 3 scripts in parallel that utilise the same (other) script, the inverse of what I expect to happen occurs when "renice-ing" the processes as they ...
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2answers
4k views

Difference between nice level and systemctl CPUShares property

As I understand it (please correct me if I'm wrong), systemctl set-property ... CPUShares=some_value limits the cpu time for an entire cgroup unit. If we instead want to limit cpu time for a process ...
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2answers
3k views

Using and understanding systemd scheduling-related options in a desktop context

In systemd service files, one can set the following scheduling related options (from the systemd.exec man page, correct me if I'm wrong): Nice Sets the default nice level (scheduling ...
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5answers
877 views

How to tell whether the 'nice' command is working?

I have a process that runs at about 100% CPU. So I run it with nice: $ nice /dir/myamd.sh The top command shows that my process still runs close to 100% (maybe slightly low like 99%). Is the nice ...
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1answer
1k views

What is kintegrityd and why it has -20 nice value?

I have a Linux distro in my laptop, with 3.18.17, 32-bit Kernel. Running top has listed below output, I am aware a little about nice and renice of process in Linux. Looking into top, I understood ...
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1answer
1k views

Does Linux Change a Process Niceness Automatically?

I know you can change a process niceness with setpriority or nice or renice. However, does Linux automatically adjust/change a process niceness without user input? I have a process for which I use ...
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1answer
131 views

Will renicing (lower) a process make it faster under memory pressure?

Let's say I want to prioritize a few processes that are running on a device with high memory pressure. These processes are UI processes (Android, specifically) and are running very slowly in this ...
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3answers
273 views

Is nice ignoring aliases?

I have alias rm='rm -i' in my ~/.bashrc file (I've just learned it is considered bad practice by some). It seems the alias is not taken into account when running it with nice: bli@naples:~$ touch ...
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3answers
3k views

What exactly is meant by a “niced” and an “un-niced” user process?

I was using the "top " command and I came across the nice value. I am aware of the priorities and how a nice value indicates the priority of a process. But I can't seem to figure out what the term "...
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1answer
804 views

What is largest value of priority in limits.conf?

What is the largest value one may set the priority limit to in limits.conf? I came across a script that adds the entry, admin hard priority 50, but this simply results in the nice being set to 19. ...
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6answers
7k views

How to renice all threads (and children) of one process on Linux?

Linux does not (yet) follow the POSIX.1 standard which says that a renice on a process affects "all system scope threads in the process", because according to the pthreads(7) doc "threads do not share ...
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2answers
55 views

Can making CPU-intensive processes lowest priority (19) have adverse effects?

When I make a CPU-intensive process lowest priority (niceness of 19), it seems the amount of real memory consumption goes up. Perhaps this has other causes. But, can making CPU-intensive processes ...
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1answer
413 views

Why is nice-level ignored? (Between different login sessions — honoured if started from same session.)

When I start two CPU-eating processes with different nice-level, e.g. Process 1: nice -19 sh -c 'while true; do :; done' Process 2: sh -c 'while :; do true; done' (I changed the order of : and ...
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1answer
139 views

Is there any command that limits the use of cpu resources by percentage?

So far I've been using nice -n 10, but that's just sets the priority of the command I want to run low, but if there's no other process running at that time the command will take all the remaining cpu ...
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1answer
521 views

`cpulimit` and `nice` not effective in limiting the cpu usage of a python program that contains heavvy computations using theano

I am running a program written in python that makes heavy computations using theano. As it is a very CPU-intensive program, it is disrupting all my other activies on my laptop. For this reason I ...
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0answers
300 views

Would a process with the higest nice value use only *free* CPU time

I want to be sure that a scheduled job, mostly using gzip, will not impact the production. This is an old Linux server with few CPU, it has SAN attachment so the gzip is running at its maximum using ...
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1answer
2k views

What is the difference between nice and renice?

What is the difference between the two commands nice and renice to manage process priority?
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1answer
85 views

nice command behavior when only 1 function running

I just learned the existence of nice (and ionice) which seems to be really interesting. I just want to launch a process 'p_low' with less priority than my ususal one 'p_normal'. What I was able to ...
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getpriority returning different value on different hosts with same kernel version

I am running centos 6.6 on same type of hardware with kernel version "2.6.32-504.30.3.el6.x86_64" Has anybody seen this why the below code when compiled and executed gives a different value on two ...
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2answers
1k views

What makes it possible for a `pulseaudio' process to get the nice level of -11?

I noticed that a pulseaudio process on my Gentoo Linux machine has the nice level of -11. But I don't know how it has gained such a high priority regardless of being owned by a normal user. I know a ...
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0answers
106 views

What is the best practice for setting a process niceness?

I have an agent which runs on my customer's hosts. I want this agent to leave the smallest possible footprint on their hosts, that is, I don't want to degrade my customers' performance. My agent runs ...
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1answer
263 views

Trying to Write a Script to Kill Processes based on niceness

I am trying to write a script in bash that will kill any of my own processes (and run indefinitely) if those processes have a niceness value of 4 or lower. Can anyone tell me what might be wrong? ...