Questions tagged [real-time]

Real time computing is where a computer can act guaranteed within a specified time frame.

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On a hard realtime OS, what happens if a process takes too long? Would programs just crash or something else?

I've read that a realtime scheduler won't wait on a process to complete certain tasks if they take too long in order to maintain realtime capability. The way I understand it is an OS will wait on ...
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FFMPEG Real Time Audio

I have looked everywhere for the answer but my head is spinning a little bit and I can't seem to find the final answer. My goal is to get audio from my microphone in buffers of 512 audio samples, ...
Arno's user avatar
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How does real-time computing handle a CPU with 2 kind of cores (performance and efficiency)?

I am looking for a CPU to perform real-time computing on KVM with RTOS clients. For true real-time with the lowest latency possible, 1 VM need to have 1 physical core (to avoid waiting when both ...
user161458's user avatar
1 vote
1 answer
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Can an RTOS (real-time operating system) read and write files in a filesystem?

Can an RTOS (real-time operating system) read and write files in a filesystem? Or is it restricted to operating with volatile memory (RAM) only? If it can, how can the timing guarantees be enforced? ...
Pedro A's user avatar
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showing ffplay in real-time

I am using ffplay (showcqt) from FFMPEG, in Linux, to analyse music compositions. Currently I have to record as an MP3 file then play the file through ffplay showcqt to see the visualisation, tweak ...
Phil Busby's user avatar
1 vote
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435 views

Asterisk outbound_registration real time issue

I configured an asterisk to run with realtime database. Every thing is working as expected, except the outbound_registration part, which was not running unless using pjsip.conf static file! From ...
Mohamed Lotfy's user avatar
1 vote
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Regular audio glitches on Linux with Scarlett 3rd gen USB interface

I have a Scarlett 18i20 audio interface running well on a Samsung laptop with Linux Mint 19.3 Tricia and with the 5.0.21-rt16 real time kernel with fully preemptive configuration. The same set up on ...
sebinho's user avatar
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How do I synchronise two folders in real-time in macOS?

im using macOS Catalina, and I want to sync two folders in real-time. One is on my Desktop for me to see and use (auto-sharing between all my os devices via iCloud), and at the same time, the other ...
Vitor Dias's user avatar
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Windows 7 Event Viewer - Save logs in real-time

I recently changed event viewer to save logs to an external drive then restarted my computer. It's working fine, however, the logs aren't being written in real time. When I open Event Viewer, it ...
gatzkerob's user avatar
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How do I improve ALSA performance (or apply low latency) to real time Linux?

ALSA project homepage contains "Low latency howto" pagae. The link is below. https://alsa-project.org/wiki/Low_latency_howto Unfortunately, this is too old because this is written for Linux kernel 2....
前橋太郎's user avatar
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Is it possible to initiate a IP to IP connection between two ethernet ports of a PMC (PCI Mezzanine Card) card?

Is it possible to initiate a IP to IP connection between two ethernet ports of a PMC (PCI Mezzanine Card) card? A physical network is divided into two subnets having 2 host each. These two ports are ...
Anish Basnet's user avatar
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Is Windows capable of hard real-time?

I have read that Windows is a preemptive OS. However, there is the option to set process priority to "Realtime". Can processes with the "Realtime" process priority in Windows be preempted? If so, are ...
Spaghaetti's user avatar
1 vote
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What prevents my RT thread from working?

I have some data acquisition application running under Linux 2.6.37 on DM8148 with TI Linux. I have two threads: thread named IDE, scheduled as SCHED_RR, prio 114 (75), which collects data from HW ...
leonp's user avatar
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Unable To Transcode 8 Sources In One Instance Real Time (FFmpeg)

Just the other day I posted about my inability to transcode a multitrack video real time, -rc-lookahead ended up being the solution. However this was when recording fairly static signals, when each ...
ninbura's user avatar
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What happens if I set single threaded process to realtime priority on multicore PC?

I'm referring to Windows 10 operating system, but I believe the answer might be OS independent. On windows, the real-time priority level is the highest priority level, use to process keyboard and ...
Julien__'s user avatar
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Do real time operating systems support paging? [closed]

Is it possible to run multiple processes, not threads, on a microcontroller using an RTOS? If not, I can't see a reason for not always using a flat memory model? Without multiple processes, I can't ...
Coffee's user avatar
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How to enable realtime mode on linux?

I have sample, quite useless application, which generates signal(short spike of some frequency, followed with longer silence period, at the tail), then have to write it to sound card. Soundcard is ...
xakepp35's user avatar
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1 answer
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Apache SVN realtime recommended backup solution

I have an apache subversion running in production environment, the repository size is around 100 GB. Now I am trying to build a failover standby for the primary SVN server. I have gone through a ...
Arun Kumar's user avatar
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1 answer
1k views

Yocto core-image-rt compilation error

I am trying to build the 'core-image-rt' on BeagleBone platform.  But I am getting following error: ERROR: Nothing PROVIDES 'core-image-rt' ERROR: core-image-rt was skipped: Set ...
nyk_mat's user avatar
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What is the difference between ulimit -r and -e?

What is the real-time scheduling priority mean (ulimit -e) ,and how to use it ? -r The maximum real-time scheduling priority -e The maximum scheduling priority ("nice")
nihan's user avatar
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Is latency from hardware interrupts a hardware, driver or kernel issue?

Being a power user I have spent countless hours tuning systems, checking DPC latency blah blah All of this begs the question why are we still dealing with these issues? I personally can't tell if ...
innerspace's user avatar
-2 votes
1 answer
118 views

How to understand and control PC suspension [duplicate]

I am using Windows 7 and it goes "off" periodically, I presume either suspended or screen locked (how can I tell the difference?) This is a problem because sometimes I run applications that should ...
Tyler Durden's user avatar
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Software to draw figures in the display [closed]

I just want to ask if someone knows some software to draw in real time shapes on screen, like a rectangle. This is very util for me for example when Copying stuff, or adapting stuff from a place that ...
gds03's user avatar
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Real-time option in ulimit

Calling ulimit -a returns the following: core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -...
Arapajoe's user avatar
53 votes
5 answers
9k views

Are CPU clock ticks strictly periodic?

Is the frequency of a CPU a mean value of about how many clock ticks there are in a second or does it have a more strong, physical stability? In my opinion, it must be not stable nor unstable. So ...
Gaël Barbin's user avatar
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Twitter alerts for keyword volume per hour

My company has a twitter account that normally gets 10-20 mentions per day. If I start getting 30+ mentions in a day, I know that something in my application is broken. How can I set up a monitoring ...
SAR622's user avatar
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1 answer
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"Not responding" error while CPU and Memory are free

Sometimes, while CPU and Physical memory are free, some program's status change to Not responding! Why?! For example as you see below, 80% of CPU and 25% of RAM are free! but VMware went to Not ...
TheGoodUser's user avatar
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1 answer
161 views

How to track some periodic system activity which hinders realtime performance

I'm running Jack2 with Pianoteq-5 on two core laptop running 64bit ubuntu-14.04. Such configurations are very sensitive to realtime performance because of low-latency requirements. At first I heard ...
Dmitry Vyal's user avatar
-1 votes
1 answer
94 views

getting webcam frame from 2 different computers

I want to receive real-time recording from 2 computer webcams to my laptop via internet. I'm using Debian. Which is the simplest way?
1234567's user avatar
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3 votes
1 answer
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Realtime transcoding to H264+AAC in Matroska container

Scenario I have a movie library which I'm looking to make streamable to my Android tablet using VLC for playback. I want to use H264+AAC for best possible visual quality over a mobile internet ...
Emily L.'s user avatar
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1 answer
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Autohotkey - get recording Volume of default device's mic

I have already googled and found this: http://www.autohotkey.com/board/topic/21984-vista-audio-control-functions/. But this library dont gives what i want: i want to get the real-time recording volume ...
Dave's user avatar
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1 vote
1 answer
129 views

Looking for software that displays realtime access to files on HDD [closed]

I'm looking a some software that will show me any and all files that are being accessed, modified, created, etc... in real time on my HDD. I don't know what to even look for. Process Explorer didn't ...
Hebon's user avatar
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1 vote
3 answers
2k views

Real time backup/file copier whenever a folder's content changes? [closed]

I am looking for real time backup/file copier whenever a folder's content changes. So whenever a file's content changes or a new file is written or a file deleted, I would like to automatically have ...
Tony_Henrich's user avatar
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5 votes
2 answers
11k views

Under linux, how do I find out if some specific thread is run with real-time priority?

I have a process (jackd) that runs several threads. One of the threads it runs should be in realtime, the others run on normal priorities. I'd like to check if it actually runs on realtime. What ...
Turion's user avatar
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3 votes
3 answers
20k views

Real-time graphing application for SQL data [closed]

I am looking for a free data graphing application that can pull data from MySQL and display it on a trend graph without any programming. It should use a GUI to select the data to be plotted, start ...
Automate's user avatar
3 votes
1 answer
2k views

VLC, realtime priority and rtkit

How can I increase the priority of VLC to some realtime level? The realtime setting inside of VLC does not seem to have any effect. I figure it nowerdays (on a modern Linux system, not a from scratch ...
Has QUIT--Anony-Mousse's user avatar
2 votes
2 answers
1k views

How to run dohell command with hackbench?

I am missing a point w.r.t the usage of dohell command. Please point out. anisha@linux-dopx:~/Desktop/RealTime/downloadedPages> /usr/xenomai/bin/dohell -b ~/Desktop/RealTime/downloadedPages/...
Aquarius_Girl's user avatar
1 vote
1 answer
123 views

Adeos's role w.r.t Linux

The event pipeline The fundamental Adeos structure one must keep in mind is the chain of client domains asking for event control. A domain is a kernelbased software component which can ask the ...
Aquarius_Girl's user avatar
22 votes
3 answers
25k views

What does "Windows is not a real-time operating system" mean?

I came across an application called LatencyMon, that apparently does latency monitoring. I have always understood that the more of a load you put on the processor, the less responsive, or more ...
Chad Harrison's user avatar
12 votes
3 answers
32k views

What is the use for the "realtime" priority for a process?

In my experience, setting any process to realtime will make your computer slow down to a snails pace. What is the use of this setting, if it makes your computer unuseable?
Koen027's user avatar
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10 votes
2 answers
1k views

Is there a way to display a real-time image histogram of all or part of what my monitor is displaying?

I am trying to adjust brightness/contrast in photo/video editing software that does not provide image histograms. What I would like is a piece of windows software that displays a real-time histogram ...
cxnull's user avatar
  • 101
2 votes
0 answers
324 views

How to have a soft-real-time process in presense of heavily swapping IO-intensive background load?

schedtool: PID 32301: PRIO 4, POLICY R: SCHED_RR , NICE -20, AFFINITY 0xf ionice: realtime: prio 4 But the music is stumbling anyway. Background load is low prio (SCHED_IDLEPRIO, idle ionice),...
Vi.'s user avatar
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1 vote
2 answers
3k views

Extracting RTD (Real Time Data) from Excel file

I have an Excel 2010 file containing auto-updating cells with RTD. Example of cell: =RTD("xxx";"yyy") I need to extract (in a .txt file) those cells' values, every X minutes. My .txt file MUST ...
Mat0930912's user avatar
0 votes
2 answers
844 views

Real-Time Collaborative Editor that is private? [closed]

Are there any good real-time editors that are browser-based, offer some formatting (bold, underline, etc,) and are NOT served in an external server (such as Google Wave)? I'd like to serve a real-...
Jon's user avatar
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4 votes
4 answers
131 views

What is a general term for software that replaces what you are typing in realtime?

What is a general term for a program similar to Texter, AutoHotKey, PhraseExpress or the shortcut functionality on the old Palm OS?
leeand00's user avatar
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2 votes
0 answers
306 views

How to do a real-time task with a high-load background task in Linux?

I've started recording of sound (minor CPU, memory and IO load) as schedtool -R -p 2 -e arecord -f cd > qqq5.wav And perform large compilation (high CPU load + high memory load + high IO load) as ...
Vi.'s user avatar
  • 17.1k
3 votes
1 answer
3k views

PuTTY log to disk in real-time?

Is there a way to have PuTTY log a session to disk in real-time?
lance's user avatar
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4 votes
3 answers
2k views

LAN version of OnLive/Gaikai

I'm patiently following news about OnLive and Gaikai type solutions, especially their (slooooow) way to Europe/Germany. I currently own a pretty beefy PC for almost games-only. But as many people my ...
eric's user avatar
  • 265
3 votes
3 answers
10k views

View real time hard drive transfer rates for Mac

I am looking for a program/app that will show me the current data rate that is being written and/or read from the hard drive in real time, for the Mac. I want to see the rate at which the hard drive ...
v15's user avatar
  • 1,955
3 votes
3 answers
735 views

Real-time offline folder-to-folder backup application needed (Windows)

I recently started using Intel Matrix Storage RAID solution that allowed me to use my 5 1TB drives for two RAID volumes. First one a 1TB RAID 0 striped across all 5 drives and second one a RAID 5 ...
niktech's user avatar
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