Re: Snappy compression algorithm for Reiser4.

[Edward Shishkin <edward.shishkin@gmail.com>]

21.09.2013 23:12, Evgeniy пишет:
> Hello all,
>
> Last few days I was playing a little bit around implementation Snappy
> algo in Reiser4. My code is dirty and should be optimized. But it's
> enough for testing.
> According to my tests Snappy shows near the same prefomance as LZO. In
> some kind of situations Snappy shows better compression with the less
> CPU usage.
> LZO has a few advantages over Snappy:
> 1) It's in kernel by default
> 2) It's optimized better then Snappy.
> Also a very significant fact is we're plaing with small blocks of
> data. In this case results of all algorithms looks near the same.
>
> Maybe in the future I'll reqrite a little bit BratSinot's LZ4 patch
> (http://sourceforge.net/p/reiser4/discussion/general/thread/780facb4/)
> to make it use LZ4 library which is build-in kernel. Friendly
> speaking, I'm not expect any big difference in comparison with LZO.
> But in any case, it funny :)


Support of a new compression algorithm means a format change.
So, people with roots on reiser4 will be forced to fsck their partitions.
So, not so funny.  A visible advantage in some benchmarks is highly
desirable..

Thanks,
Edward.


>
> If anybody want to test Snappy compression algo - let me know, I'll
> make patches to kernel and reiser4progs.
>
> Have a nice [the time of the day],
> Thanks
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