For testing purpose of an application, I would like to limit the RAM of a server. I prefere not to remove the RAM-sticks. I could not find an option in the BIOS. Is there a way to modify this in the Linux configuration?
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ulimit -d $SIZE_IN_KB to limit the data segment of the current bash shell and whatever you launch from it.
help ulimit in bash gives you the documentation.
ETA: If you want to limit the whole system, set
mem=1G as a boot parameter in grub (doc).