LOL, I actually found that script 10mins before you posted, and was mucking around with it It seems to work fine, just need to change a few settings.
fill in how many tiles you want, must be non zero.
n = 2 # n tiles wide (x)
m = 2 # m tiles high (y)
percentage_of_current = 300
total_tiles = n*m
location = “/ /”
filename = “MyRender”
filetype = “png”
-The n and m are just the number of tiles across and high that you want you want (how many sections do you want to split the frame into)
-percentage_of_current is just how big you want it rendered. So at the moment if your scene was set to 100x100px, this will render at 300%(so 3 times the size), making it 300x300px. I am currently doing a test where I put tiles n and m at 10, and then this value at 1000 (10x the original). Should mean that each tile will average about the same amount of time (with reduced ram usage) than the original, but it will be 10 times as big.
-location is where the images will be saved. So in windows, I used location = “D:/temp/rend_out/” and that saved the images in D drive > temp > rend out.
-filename is just the name of the output files, so with these settings, there will be MyRender_1_1.png, MyRender_2_2.png etc
-filetype is just what it sounds like, I changed mine to jpeg from png.
To run the script, simply open a text editor panel (lower left of every panel are the options), create new text file and paste this code in there. Edit the settings as required, and in the text menu, choose run script. At this point, it will say blender is not responding, but if you look in the output folder, it will start putting rendered files in there.
I suggest you start with something small (like 1920x1080) and set the percent to 100 (so you are not rendering anything huge), and just tile it to 2x2. That way you can see that its running.
Once output, the files are filename_xloc_yloc.png, where filename is specified as above, xloc is the number of places across and yloc is the number of places down. So MyRender_1_1.png would be the image for the top left. MyRender_2_3.png would be the image second across and third down. Just piece them all back together in photoshop…