Re: [GSOC] HAMMER2 compression feature week11 report

Daniel Flores <[email protected]> Tue, 3 Sep 2013 00:23:00 +0200

Newsgroups	gmane.os.dragonfly-bsd.kernel
Message-ID	<CAJcZ+E0jREPjYho8Ds0_KcxoQwwOy7hymNLTTnRSDFSGT9GPiw@mail.gmail.com>

Hello,

LZ4, generally, can compress text files, but in our case it doesn't give us
enough compression ratio to produce a compressed block. The maximum size of
a compressed block is 32KB while the size of uncompressed block is,
typically, 64KB, so a compression algorithm must be able to reduce the size
of input data by, at least, 50%. I think, LZ4 can reduce the size of a text
file by 40%, but, sadly, that's not enough in our case.

Daniel

On Mon, Sep 2, 2013 at 7:54 AM, Petr Janda <[email protected]>wrote:

> Why can't LZ4 compress text files?
>
> Petr