On 2018-07-17, at 9:30 AM, Michael <[email protected]> wrote:
> I'd like some help figuring this out. My machine cannot use compressed swap
> in 10.9.5.
>
> This is not an "always" issue. Originally it did use compressed swap with no
> problem.
So I found the first issue, and I don't understand it. I'm looking for more
help.
I had, probably by mistake, configured a boot plist at
/Library/Preferences/SystemConfiguration. I thought that the values I specified
in the boot-args nvram setting were running things, but no, that file was
overriding anything I was trying to specify on the boot-args.
So that's issue number one. I can make compressed swap "work" by removing this
line:
<string>vm_compression_limit=1048576</string>
But that's the problem. The default action is to use 10 GB of my 16 GB for
compressed swap. That's too much.
The vm compressor code is located at
https://opensource.apple.com/source/xnu/xnu-2422.1.72/osfmk/vm/vm_compressor.c.auto.html
Reading it (and it was in my browser history, as well as a question I asked on
stack overflow), the vm_compression_limit seems to go into a maximum number of
compressed pages limit.
The number in the config file is 1024 * 1024, which seems to be a reasonable
number of pages (1m pages, 4K per page, is 4 GB.) Yet it causes a swap error as
soon as the limit is reached, and I'm prompted to close an unwanted app because
the system is "out of application memory".
So I've got two choices, and I'm looking for the third:
1. No compression -- system works, but swap fills up rather quickly.
2. Compression, default -- system "works", but I don't have enough live memory.
3. What I want -- compression with less memory used by the compressor.
Can anyone help with this?
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