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Re: Memory file systems
Chris Ross wrote:
> Quite some time ago, I remember there being a conversation about
> the pro's and con's of mfs vs. tmpfs. There may, for all I've
> tracked, be further "fast non-durable file system" options now-a-days.
> My basic question is, why are there both mfs and tmpfs, what are
> the pro's and con's of each, and which (if either) is likely to
> receive more support/attention in the future?
One area is the size of the metadata needed to represent a file in
memory. mfs needs just a directory entry and an inode, whereas tmpfs
needs a couple of different UVM objects. I don't recall the exact
details, but it was something in the order of 2-3 times more memory
was required by tmpfs for metadata. This has implications for any
memory file system where need a large number of files - say a cvs
I can dig up some (oldish) data if you want more info.
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