On 2013-01-30, Constantine A. Murenin wrote:
> Hello misc@,
>
> On OpenBSD 5.2 amd64, I'm storing 1.4GB of source code files and about
> 8x 150MB indices on an mfs partition, plus a gig or two of other
> automatically-generated files.
>
> If I run mount_mfs to load all this stuff from a regular drive, then
> the amount of memory used by mount_mfs(8) is about the same as the
> amount of Used disc space as reported by df(1).
>
> However, if I re-run index generation on an mfs, then after it's all
> done, memory usage by mount_mfs(8) noticeably exceeds Used disc space.
> As a workaround, I found that it's possible to copy all the files
> over to a new mount_mfs(8) process, after the indices have been
> re-generated, and the new process will at first have a much better
> memory usage, but this seems a little inconvenient and would also
> require a temporary burst of extra RAM to accomplish.
>
> Should I worry that on a 6GB partition that is only 4GB full,
> mount_mfs uses 5GB of memory after about 3GB of data gets mingled? Is
> mount_mfs swappable? If I end up being short on memory, would that
> extra 1GB from mount_mfs(8) be swapped out without affecting the
> performance? Or is there a way to run some kind of garbage collector
> or otherwise improve on an mfs memory use?
>
> % df -hi | fgrep -e Used -e mfs ; mount | fgrep mfs ; ps aux | fgrep
> -e USER -e mfs
> Filesystem SizeUsed Avail Capacity iused ifree %iused Mounted on
> mfs:18610 5.9G4.1G1.5G73% 439864 35770255% /grok/mfs
> mfs:18610 on /grok/mfs type mfs (asynchronous, local, nodev, nosuid,
> size=12582912 512-blocks)
> USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND
> root 18610 0.0 40.2 6291936 5048352 ?? IsSun07PM0:22.56
> /sbin/mount_mfs -o rw -s6G -f2048
>
>
> Cheers,
> Constantine.
>
>
This is expected with mfs, don't set the filesystem to be larger
than the amount of memory you would like it to use.
I don't know how it behaves with swapping.