My program stops after a few hours (such as 5 hours). OMEGA2P firmware Ω-ware 0.2.2 b202.

Ick-Sung Choi

Dear William Scott, Bill.

My C program and java application(using nodejs node) is run.

The following is java server.

1495 root 43172 S /usr/bin/node /root/www1/build/serverTest.js

The java server run child en.app.js java script.

The hang is different whenever I run the program.

This time, the serial port communication does not work even though it seems to send the message.

The counter part MCU does not send/receive messages through serial port.

Thank you very much.

JP Norair

You can try to re-deploy using the latest Onion build, which is running on the 4.14 kernel.

$ oupgrade -l

Be warned, though, I do not have good results running UART on this version. 0.2.2 b202 has other problems, but it is more stable for me.

Ick-Sung Choi

Dear JP Norair.

Thank you very much for your precious suggestion.

I will try it.

William Scott

@Ick-Sung-Choi With the program stopping, perhaps all programs are stopping. This is a symptom of running out of memory (RAM) or storage (among other things). I suggest writing a quickie program (Bash) to run from cron (https://docs.onion.io/omega2-docs/running-a-command-on-a-schedule.html), perhaps once per five minutes. Execute 'free -h' and 'df -h' and append their output to a file. Include a time tag with each append.

Tail the output file while you are running (perhaps once per half hour) to determine if your storage and/or memory is being exhausted.

take care!
Bill

Ick-Sung Choi

Dear William Scott.

I really appreciate to you for your answer.

My OMEGA 2+ system halts after about 2 days after running program.

I will check the memory and disk space.

I think the memory problem can be solved because OpenWRT linux uses virtual memory (memory using disk).

Can I enlarge the virtual memory of OMEGA 2+?

If I can do it, would you tell me how to enlarge the memory?

Thank you very much.

William Scott

@Ick-Sung-Choi Although you cannot increase RAM, you can indeed add swap space that effectively increases memory. Below I'll provide a link or two to Omega documentation on accomplishing exactly that. It will require a SD card on to which the expansion would occur.

Expanding memory from O2 docs: https://docs.onion.io/omega2-docs/extending-omega-memory.html

Instructions for adding and setting up SD card: https://github.com/pjobson/onion_omega2p_experiments/blob/master/docs/setting_up_sdcard_for_root_and_swap.md

Also, I have working code (bash and Python) that will do everything for you. I could provide this to you (for free, of course). It is somewhat generalized and may work on any system. On the other hand it may be too specialized for my system. I'll provide a download link in a follow-up message.

--Bill

William Scott

@Ick-Sung-Choi Looks like there will be a little bit of work (not much) for me to make the code available. I'll do so later today.

One thing, in my opinion, that you still need to do is make a determination as to whether or not running out of memory --or-- storage is indeed your problem. Adding storage and swap is a very good thing and I highly recommend it, however your problem may be something else entirely.

At your convenience please test your system for decreasing memory and/or storage.

--Bill

William Scott

@Ick-Sung-Choi Here is a link to a collection of archives of a project I did some time ago --> Buoy project archive. Download the highest version archive to your system and un-archive it.

Change directory to one level above the 'disk' subdirectory, of course after you've inserted a SD device into the O2+. Type the following commands:

. disk/expand_mem
expand mem

The first command, the one with the leading period, simply brings the file and all of it's variables and functions into your current shell. The second command runs a function, coincidentally of the same name as the file. The function will call a number of other functions that will set up the device for use as expanded storage as well as allocate and enable swap space.

This works well if executed from the "proper" directory installing a whole system for my project (which you don't want). If it fails it may just because I'm playing fast and loose with directories here. Let me know if it fails and I'll analyze.

-take care!
Bill

Ick-Sung Choi

Dear William Scott, Bill.

I really appreciate to you for your support.

I will follow your instructions.

Thank you very much.

Ick-Sung Choi

Dear William Scott, Bill.

I really appreciate to you for your support.

I am using SD card file system in OMEGA2+ to extent storage.

Can I use both SD card file system and swap file extension in SD card?

I will really thank you if I can be given the method.

It is very important job for me.

The following is my setup procedure to use SD card file system.

File system extension procedure of OMEGA

install file system program.
opkg update
opkg install e2fsprogs
unmount SD card.
umount /tmp/mounts/SD-P1
format SD card
mkfs.ext4 /dev/mmcblk0p1
copy overlay
mkdir /mnt/mmcblk0p1

mount /dev/mmcblk0pl /mnt/
mount /dev/mmcblk0pl /mnt/ ; tar -C /overlay -cvf - . | tar -C /mnt/ -xf - ; umount /mnt/

auto-mount of overlay when start up.
opkg update
opkg install block-mount
block detect > /etc/config/fstab

vi /etc/config/fstab
Find "option target '/mnt/mmcblk0p1'" and replace it with "option target '/overlay'"
// Find "option enabled '0'" and replace it with "option enabled '1'"
reboot
Check SD card file system.
df -h

Thank you very much.

William Scott

@Ick-Sung-Choi At a glance this looks good. You might also want to add swap space either through a storage partition or a file.

--Bill