How to modifying the HAL_SIZE in linuxcnc (Insufficient memory PROBLEM)

If I understand the linked thread correctly then you can only increase the hal memory if you compile linuxcnc on your computer (aka a RIP or run-in-place installation).

If you installed linuxcnc using a package or an ISO image you cannot increase hal memory size.

So the question is: How did you install Linuxcnc?

Just the quick start part, 1.1, most probably.

Running this should create a folder named 'linuxcnc-dev' containing the source files:

$ git clone github.com/linuxcnc/linuxcnc.git linuxcnc-dev

Run these to get the most up-to-date packages
sudo apt update
sudo apt upgrade


Then install these dependencies (not all may be needed and/or you may need to install others but these should give you a good start )

sudo apt install automake
sudo apt install libudev-dev
sudo apt install libusb-1.0-0-dev
sudo apt install glib
sudo apt install libglib2.0-dev
sudo apt install libgtk-3-dev
sudo apt install yapps2
sudo apt install intltool
sudo apt install tcl8.6-dev tk8.6-dev
sudo apt install bwidget
sudo apt install tclx
sudo apt install libreadline-gplv2-dev
sudo apt install libxmu6
sudo apt install libxmu-dev
sudo apt install asciidoc
sudo apt install libmodbus-dev
sudo apt install libgtk2.0-dev
sudo apt install libboost-python-dev
sudo apt install python3-gi
sudo apt install libpango-1.0-0

then do

$ cd linuxcnc-dev/src

$ ./autogen.sh

$ ./configure --with-realtime=uspace --disable-build-documentation-translation --enable-non-distributable

Note there may be errors here about missing dependencies. If unsure post the error here.
If the above command completed without error then do:

$ make && sudo make setuid

This will take a while. If it finishes without errors then do

$ cd ..

On a rip installation, every time you open a new terminal you need to set the source to start linuxcnc

$ source scripts/rip-environment

then you can see if it works

$ linuxcnc


[edit]
Use the more current doc here:
linuxcnc.org/docs/devel/html/code/building-linuxcnc.html