successful usage on Raspberry Pi?

[TadFinkler]

Hello,
I'm trying to follow directions that a colleague wrote up for starting pantsd in a repository on a Raspberry Pi. The directions are proofed out with something more like a NUC. I'm running into

pi@ZDC2:~/repos/test_repo $ source activate.sh --print-stacktrace 16:32:38.37 [INFO] waiting for pantsd to start... 16:32:53.42 [INFO] pantsd started 16:32:54.78 [INFO] Initializing scheduler... 16:32:54.85 [ERROR] Could not initialize store for cache: "Error making env for store at \"/home/pi/.cache/pants/lmdb_store/cache/2\": Cannot allocate memory"

I can't find any references to this error that could give me a hint on where to turn next. Also, full disclosure: I'm a mechanical engineer, not a linux magician. But I'm hoping for some quick responses on:

1. Is this likely a permissions thing or a memory capacity thing?
2. What are the minimum memory requirements for pants to work?
3. Can anybody vouch for successful deployment on a Raspberry Pi? If so, what hardware and os versions?

Thank you!

[sureshjoshi]

Could you show the instructions your colleague gave you? I just realized, I never tried on a Pi, but I have like 4 on my desk - could give it a shot, if I can find my SD cards

[TadFinkler]

I'd feel better about being stuck if the instructions were more complex:

Prerequisites
You'll need to have Pants installed on your development machine. You can find instructions for installing Pants here. Make sure that you follow the instructions to make pants available on your path, as the activate.sh script discussed below assumes it can be found there.

Development Environment
The recommend way to perform development is by using VSCode Remote Development over SSH on a host with your target hardware attached. This removes the requirement to "deploy" code to the tester and allows much quicker iteration times while developing software. You can even use the VSCode debugger!

Use the activate.sh script at the repository root to set up your environment.

source activate.sh

Assumed in there is cloning a repository onto the Pi.

I'm running 64 bit Debian Bookworm. Raspberry Pi 4, 4 GB RAM and a 32GB SD Card.

Thank you for your help.

[sureshjoshi]

Ah, okay, I see the problem - gotta run the script and hope :)

I'll try setting up a rpi maybe tonight, or in the morning - just to sanity it.

[sureshjoshi]

Trying to install scie-pants on my RPi 4B

  `.::///+:/-.        --///+//-:``    pi@ 
 `+oooooooooooo:   `+oooooooooooo:    ------------- 
  /oooo++//ooooo:  ooooo+//+ooooo.    OS: Raspbian GNU/Linux 11 (bullseye) armv7l 
  `+ooooooo:-:oo-  +o+::/ooooooo:     Host: Raspberry Pi 4 Model B Rev 1.1 
   `:oooooooo+``    `.oooooooo+-      Kernel: 5.15.76-v7l+ 
     `:++ooo/.        :+ooo+/.`       Uptime: 15 mins 
        ...`  `.----.` ``..           Packages: 613 (dpkg) 
     .::::-``:::::::::.`-:::-`        Shell: bash 5.1.4 
    -:::-`   .:::::::-`  `-:::-       Resolution: 2560x1080 
   `::.  `.--.`  `` `.---.``.::`      Terminal: /dev/pts/0 
       .::::::::`  -::::::::` `       CPU: BCM2711 (4) @ 1.500GHz 
 .::` .:::::::::- `::::::::::``::.    Memory: 92MiB / 3838MiB 
-:::` ::::::::::.  ::::::::::.`:::-
::::  -::::::::.   `-::::::::  ::::                           
-::-   .-:::-.``....``.-::-.   -::-                           
 .. ``       .::::::::.     `..`..
   -:::-`   -::::::::::`  .:::::`
   :::::::` -::::::::::` :::::::.
   .:::::::  -::::::::. ::::::::
    `-:::::`   ..--.`   ::::::.
      `...`  `...--..`  `...`
            .::::::::::
             `.-::::-`

curl --proto '=https' --tlsv1.2 -fsSL https://static.pantsbuild.org/setup/get-pants.sh | bash

Pants is not supported for this chip architecture (armv7l). Please reach out to us at https://www.pantsbuild.org/docs/getting-help for help.

Testing out bullding from source on the pants main repo right now.

[sureshjoshi]

Can I ask a more overarching question... Why are you developing on a Pi specifically? Does it have to do with your output architecture? Is cross-compiling an option?

[huonw]

Is this likely a permissions thing or a memory capacity thing?

Without knowing the details for sure, I wonder if it's sort-of a memory capacity issue: if the system is running a 32-bit operating system, there's only 4GiB of addressable memory for things like "memory-mapping" of files (basically, pretending a file is an array of bytes in memory)... and I wonder if Pants' cache does this internally. If Pants attempts to mmap a file that's larger than 4GiB, that's impossible: there's not enough memory addresses to fit it.

(This works fine with a 64-bit operating system, even with the same amount of physical memory: the operating system doesn't need to pull the whole file into memory at a time, it can insert magic behaviour for a particular range of addresses to go off and read the file as required, paging sections in and out of physical memory.)

What does uname -a say for your system?

[MTSliwinski]

I encountered the same error while using a Raspberry Pi 4B with 8GB RAM that had Bookworm installed. After switching to Ubuntu 22.04 LTS on the Raspberry Pi, the issue no longer occurred, and everything has been working fine since.

[TadFinkler]

Thanks - I'll give that one a try!