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Questions tagged [realtime]

Related to the use of Ubuntu as a real-time OS, whether through use of a patch, replacement kernel or other method. This is often desired in the context of industries such as automation and CNC machines, as well as certain audio applications. Questions may relate to specific real-time patches/kernels, integrating those patches/kernels on an Ubuntu system, or using an RT Ubuntu system in a given application.

A real-time operating system (RTOS) is an operating system intended to serve real-time application process data as it comes in, typically without buffering delays. Processing time requirements (including any OS delay) are measured in tenths of seconds or shorter.

This is often desired in the context of industries such as automation and CNC machines, as well as certain audio applications. Questions may relate to specific real-time patches/kernels, integrating those patches/kernels on an Ubuntu system, or using an RT Ubuntu OS in a given application.

84 questions
65
votes
7 answers

A2DP on PulseAudio - terrible choppy/skipping audio

I have paired my Bluetooth headset with my Ubuntu 12.04 laptop with a Bluetooth chip inside: lsusb | grep Bluetooth Bus 003 Device 003: ID 045e:0745 Microsoft Corp. Nano Transceiver v1.0 for Bluetooth The device has been paired, and with the help…
Naftuli Kay
  • 4,344
26
votes
4 answers

How can I install a realtime kernel?

I have read a lot of threads with similar questions, but after reading the answers, I am very confused. I have found in them lots of url's with repositories but people discusses about which repositories are made for one or two versions of ubuntu,…
George
  • 261
23
votes
2 answers

timedatectl- NTP Sync cannot set to yes

I tried so much different things of installing ntpq or other stuff but nothing works. I dont can change it to yes. I hope someone can help here. I had Ubuntu 16.04 This is my terminal output of the Command timedatectl Local time: Tue…
Scholli
  • 331
11
votes
6 answers

how to update dolphin file manager in real time

If I have dolphin open and I'm working in the terminal or on Windows files might be moved or added. How would I go about to make sure it updates the status of a directory of real time? Presently I cannot even use back to update and constantly have…
user140393
  • 486
10
votes
3 answers

Why to use ordinary kernel if there's realtime one?

What are benefits of an ordinary Ubuntu kernel compared to realtime one? What are realtime kernel's tradeoffs?
Ivan
  • 58,745
10
votes
2 answers

Can it be harmful to grant jackd realtime priority?

I am apt-get installing Ardour, a sound mixing program, just to try it out. Installing Ardour also installs JACK, a dependency. As part of the JACK installation script, I get the following dialog: If you want to run jackd with realtime priorities,…
SuperElectric
  • 905
7
votes
4 answers

How to install realtime kernel?

Axel wrote: "try using the a realtime kernel, it's more responsive and the apps "seems to hang less"". How to do this?
Ivan
  • 58,745
7
votes
1 answer

Using the RandR-enabled nvidia 302.xx beta driver in 12.04 with a realtime kernel

How can I use the recent beta of the 302 version of the nvidia driver (which finally supports the RandR extension!) with a realtime kernel in Precise? This question contains information on enabling the current 295 version for the 3.4 kernel with the…
pablomme
  • 5,870
6
votes
2 answers

Is it possible to direct system monitor output to a file?

I want to save to a text file the CPU and memory usage real-time info displayed in Gnome System Monitor 3.6. Does anybody know if this is possible? If so, how can it be done? If it's not possible with Gnome System Monitor another tool is fine, as…
pnneves
  • 61
6
votes
1 answer

How do I get the newest lowlatency-kernel on 18.04 LTS?

When installing the linux-lowlatency package on 18.04 LTS, the lowlatency-kernel version 4.15 is installed, while the -generic kernel has been updated to 4.18 since the LTS release. 4.18 linux-lowlatency packages are only available for cosmic and…
Prototype700
  • 1,120
5
votes
1 answer

How to get to a perfect jackd configuration that works trouble-free and out of the box?

While working on a PPA to provide binaries for Sonic Pi, the users of the PPA binaries keep stumbling over jackd. How to make things easier for them? Sonic Pi is an educational music tool that combines an electronic synthesizer with a programming…
hez
  • 181
5
votes
1 answer

What is clamd's function?

I understand that there is currently no real-time AV for Linux, or at least not using ClamAV. So what is clamd's function then? Because that talks about on-access scanning, so what is that if not real-time scanning? And why is it running all the…
user364819
3
votes
1 answer

Low Latency Kernel Downsides?

I'm considering moving from stock Ubuntu to Ubuntu Studio. My only concern is the low latency kernel. I've looked into what exactly it is, and know it will be great for my audio work, but I am wondering if it has any downsides? Does it cause…
AdLinux
  • 526
  • 2
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  • 26
3
votes
0 answers

Does Ubuntu Core support real-time?

Does Ubuntu Core's kernel support (hard) real-time? If not, is it using a standard kernel, which can be patched with the CONFIG_PREEMPT_RT set?
mystery
  • 131
3
votes
1 answer

Realtime kernel running as virtual machine

I read that using a Linux kernel (Ubuntu rt kernel) was able to increase the response time of a Java application by 4x. My only problem is that I must run a program that only has a Windows installation on the same machine. My question is: Will…
user10403
  • 33
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