Is there any way to disable memory compression in Mavericks? Ever since I upgraded, my Minecraft server has been using ludicrous amounts of CPU time and choking. I'd like to test without compressed memory to see if that might be the culprit.
Answer
vm/vm_pageout.h defines the modes for the vm_compressor boot argument, which defaults to VM_PAGER_COMPRESSOR_WITH_SWAP (per vm/vm_compressor.c). For OS X 10.9, 10.10, and 10.11, you can disable compression by changing the vm_compressor_mode argument to 1 (VM_PAGER_DEFAULT). That is:
sudo nvram boot-args="vm_compressor=1"
Then reboot. You can verify the change was successful by running:
sysctl -a vm.compressor_mode
Starting with macOS 10.12 Sierra, the old VM_PAGER_DEFAULT is no longer supported and vm_compressor=1 is converted to vm_compressor=4 inside the kernel.
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