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Old 11-06-2009, 05:36 AM   #1
marcdbl
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Restricting available physical memory in Linux

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I am doing some application testing, using CentOS 5 running on x64 with 32GB of physical memory.
I want to see how the application behaves when only 8GB of physical memory is present in the server. Is there a way I can artificially restrict the physical memory to a lower amount such as this?

I can't remove DIMMs from the machine as it's in a remote datacentre.

Windows makes it easy using the /maxmem boot options, but I can't find any reference to such a trick in Linux....

Thanks.
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Old 11-06-2009, 09:15 AM   #2
cantab
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mem=MEMEORY_SIZE. Put it in the grub configuration line that starts 'kernel'.
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Old 11-06-2009, 09:34 AM   #3
jlightner
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You could always install the Xen kernel and setup a virtual machine that has the characteristics you want.
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Old 11-06-2009, 10:29 AM   #4
marcdbl
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Originally Posted by cantab View Post
mem=MEMEORY_SIZE. Put it in the grub configuration line that starts 'kernel'.
Thanks Cantab, that looks just the job.

(Unfortunately I need to be testing native performance so Xen is no-go in this case).
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