Questions tagged [process]

For questions pertaining to CPU processes.

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Background process capture GPIO input

This question suggests it is doable - Script Running in Background GPIO.cleanup() on shutdown? In a desktop environment with another process displaying its window, is it possible for a background ...
kellogs's user avatar
  • 101
2 votes
3 answers
104 views

How can I bring a proc started on a different shell in the background to my foreground and then put it back to background

Pfiew that was a long question... So, during bootup, I am starting on the background a python script (it gets called in the launcher). sh /home/pi/launcher.sh& When I ssh to the rpi I can see the ...
papatrexas's user avatar
0 votes
1 answer
149 views

Does there exist a list of all required processes, for a raspberry pi running raspbian, to continue proper operation? [closed]

I am using the htop command to get a list of all processes running on my raspberry pi 4 and I was curious if there exists a list of all processes that are required for the pi to continue running. I ...
Nathan Walters's user avatar
0 votes
1 answer
316 views

Trying to kill all processes, but new processes keep spawning

I'm trying to rename the default pi username after getting a new raspberry pi 4. I am completely new to Linux, so my knowledge of the matter is small. From what I've discovered, one way to rename pi ...
Gabe Morris's user avatar
0 votes
1 answer
55 views

Process in real time

I am building a Pov Display using Raspberry pi 4 and a code written in Go. The raspberry pi has a sensor (btn) to know when it displays the code. The problem is my raspberry won't execute the code at ...
0ussama's user avatar
  • 11
0 votes
2 answers
1k views

nobody user running demon

My raspberry pi has been hacked and as result my samba files have been encrypted by the user nobody. There is a thy demon that keep running in my pi by the user nobody. I have been searching ...
Zindik's user avatar
  • 1
0 votes
1 answer
756 views

Plotting CPU and Ram utilization

I want to plot the CPU and memory utilisation of an Apache server hosted in Raspberry Pi 3B+ with Raspbian Stretch in it. For that I have followed the procedure mentioned here. The instructions work ...
se7en's user avatar
  • 13
2 votes
5 answers
2k views

Why is cron needed for Raspbian?

I was looking for some sort of process that is lagging my device. While searching I found that cron is running. If I understand this correctly then cron is needed to run serials of command at a ...
Sohan Arafat's user avatar
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0 votes
1 answer
3k views

How to restart/release rfcomm for bluetooth communication?

I am trying to connect raspberry pi to my galaxy note to use it for serial communication. I have somewhat succeeded at that. First I paired it and trusted through bluetoothctl. Then I run sudo rfcomm ...
mega_creamery's user avatar
0 votes
0 answers
28 views

How to prevent programs like Jenkins from stopping/sleeping/waiting

I know this is probably a silly question, but I'm trying to get Jenkins running on my pi for a project. I've installed jenkins, changed the port to 9080 and port forwarded so that I can view it ...
James's user avatar
  • 1
1 vote
0 answers
65 views

Why the hourglass icon is showing?

After an update of with 'rpi-update' command, while I am opening this menu ,I am noticing a sand-glass icon with the pointer. This is not a very big problem. But I am confused ,what is happening?? ...
Sohan Arafat's user avatar
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5 votes
2 answers
920 views

Can the Raspberry Pi 4 better distribute Python scripts to all four cores?

This relates to previous questions regarding the GIL (Global Interpreter Lock) for Python on the Raspberry Pi. My question has to do with the new processor on the Pi 4 - does it still have the same ...
ConcernedHobbit's user avatar
1 vote
0 answers
44 views

Is it possible to take a picture with the top half of a camera feed, then the bottom half?

Is it possible to take a picture with the top half of a camera feed, then the bottom half? and would it require half as much processing power?
Daverry's user avatar
  • 11
1 vote
1 answer
106 views

raspberry pi zero w process load handling

this is my first project with Raspberry pi. i want to make a Testing chamber for growing micro greens(small plants). What this chamber does is following: 1- weigh the the 4 growing pods with load-...
MMoazam's user avatar
  • 13
0 votes
1 answer
626 views

System Freezing Up, Bad SD?

I have a Pi 3 B running Raspbian Stretch. Recently, I started experiencing lag logging in with SSH, and sporadically during use. It really became apparent when I tried zipping my 2GB Plex library ...
Dustin Lewis's user avatar
0 votes
2 answers
3k views

How to properly implement threading within a function toggled by a button [closed]

I need a little help if possible. I'm trying to make a threaded function which will make my LEDs blink randomly as long as the button is pushed. when it is released it should exit the function and ...
nixx's user avatar
  • 3
1 vote
1 answer
931 views

How to check for alive process in an infinite loop and use LED as status indicator?

Clearly I'm a beginner when it comes to setting up a script. I'm trying to check if a process is alive and running, and if so, switch on an LED. I need help with the following: Check if a process is ...
Noah Smith's user avatar
9 votes
3 answers
16k views

Can't delete pi user on Raspbian

I have made a new Raspbian installation. All good. I wanted to delete pi user and make another user with same privileges (lets say gordon). So first I enabled direct ssh access to user root by doing ...
FedeKrum's user avatar
  • 193
0 votes
1 answer
561 views

Kernels running SCHED_FIFO and SCHED_RR scheduling policies respectively for Raspberry Pi 3

I want to create two kernels for the Raspberry Pi 3. One running all the processes with only the SCHED_FIFO policy, the second running the processes with only the SCHED_RR policy. Can somebody help ...
Piyuu's user avatar
  • 1
1 vote
0 answers
201 views

Setting maximum process pause time - need to read spi data with less time gaps

I am using a raspberry pi to grab data through a SPI port. Attached to the SPI port is a PIC, programmed so that it samples on an A/D at 12.8kHz, and stores the samples in a 256 long buffer. (to cope ...
J Rodgers's user avatar
5 votes
2 answers
1k views

How many cores does the Pi 2 model B use by default?

How many cores does the Pi 2 model B use by default when executing a command? The reason I am asking this is my friend told me to use the suffix -j4 when I ran the code sudo make. He told me that it ...
Braydon Gines's user avatar
13 votes
4 answers
9k views

Can I have 1 processor core just for my program?

I have to time the time difference between high -> low and low -> high signal edge on GPIO pins. I have written simple program that does this. After running it for some time I was quite happy with the ...
NonStandardModel's user avatar
-1 votes
2 answers
96 views

bash vs. & in startup, is there a difference? [closed]

When I get around to making my internet radio (still waiting for parts), I will want the command line available to startx the GUI to edit the playlist (or whatever) while the radio continues playing ...
n0ukf's user avatar
  • 77
0 votes
1 answer
524 views

No print output on raspberry IDLE

I've been trying to create a program that split few different section of my main OpenCV program to increase fps. The first thing i ever think of is the Pipe() function from my friend. I've tried this '...
aji's user avatar
  • 141
0 votes
2 answers
278 views

Raspberry Pi 2 BCM2836 working but new Raspberry Pi 2 BCM2837 stuck on Rainbow Screen

I have an old image from my Raspberry Pi 2 (Jessie Lite) and this works fine on my Raspberry Pi 2 running the BCM2836 processor, however I ordered a new Pi 2 and it seems that they have changed to the ...
Sean Bulley's user avatar
1 vote
1 answer
219 views

Is there any way to further increase the speed of clk in spi?

At first, i tried to communicate with MCP3008 with raspberry using wiring Pi library and as it communicates through the spi driver, the data retrival of it is quite slow. Then, i opt for the next ...
Abhaya Singh Pandey's user avatar
1 vote
2 answers
125 views

First and Last things it does

I'd like to display an LED which comes on as early as possible in the Pi's boot sequence to let me know things are progressing. I'd like to switch it off when the Pi has been appropriately shut down. ...
KDM's user avatar
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