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Solene has announced a new Old Computer Challenge. The challenge is to use a computer with 1 CPU, at the lowest frequency, with no more than 512MB RAM.
gemini://perso.pw/blog/articles/old-computer-challenge-v3.gmi
I'll try using a raspberry pi 3B+. It has 4 cores, 1GB RAM, and variable frequency from 600 to 1200 MHz. I was able to restrict the RAM, cores, and the frequency using boot options.
The challenge runs from July 10 to July 16. I hope to be able to figure it out by then.
On the raspberry pi, you can limit the CPU frequency by changing a setting in the /boot/config.txt file:
#uncomment to overclock the arm. 700 MHz is the default. #arm_freq=800
to
arm_freq=600
and underclocking the pi.
To limit RAM, you can add
mem=512M
to the /boot/cmdline.txt file
To limit CPU cores add
maxcpus=1
to the /boot/cmdline.txt, but I've tried, and after rebooting, lscpu and top report 1 core. See the `bootparam(7)` man page for more information on the possible boot parameters.