Sunday, June 3, 2018

Re: compressed undofiles

Adam Monsen <haircut@gmail.com> wrote:

> I use undofiles heavily. I often copy a file along with its
> undofile when creating a new similar file. I notice (a)
> the undofiles can get quite large and (b) they compress
> very efficiently. I tested compressing a few ".test.txt.un~"
> files with gzip and saw 90% compression.
>
> Anyone interested in compressed undofiles?

Indeed, I just checked and I have 200 MiB of files in
my 'undodir' directory with ~4700 files there. So it's big.

Compression and decompression may slow down Vim
So lz4 lib [1] may be the way to go as it's very fast.
zstd lib [2] has a good compromise between speed
and compression ratio. Both libs are now widely used
and available, but not as much as zlib.

[1] https://github.com/lz4/lz4
[2] https://github.com/facebook/zstd

Dominique

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