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The Archetypal Paul
Asked: 2023-10-05 01:00:32 +0800 CST

Limit the RAM available to RHEL8

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We have some tests we need to run in a server with 32Gb RAM.

All the servers we have access to have 64GB and we can't physically change this.

Is there some way of telling RHEL to use only some fixed amount of RAM, less than what is installed?

memory-usage

1 Answers

  1. Best Answer

    Boot with the kernel parameter mem=32G:

    mem=nn[KMG] [KNL,BOOT] Force usage of a specific amount of memory

    Amount of memory to be used when the kernel is not able to see the whole system memory or for test. [X86] Work as limiting max address. Use together with memmap= to avoid physical address space collisions. Without memmap= PCI devices could be placed at addresses belonging to unused RAM.

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