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Re: Fast lzma radix matchfinder

From: Antonio Diaz Diaz
Subject: Re: Fast lzma radix matchfinder
Date: Wed, 01 Jun 2022 20:04:36 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv: Gecko/20110420 SeaMonkey/2.0.14

Hello Adam,

Adam Tuja wrote:
I stumbled upon this fast lzma radix matchfinder that turned out to be twice as
fast, using half of memory single threaded, and even less multi threaded, with
only very slighlty worse compression ratio.

Thank you.

Twice as fast as what? Have you tried it against 'lzip -0'?

What is the difference with the matchfinders that have been tried and discarded in lzip 1.11?
* Matchfinder types HC4 (4 bytes hash-chain) and HT4 (4 bytes hash-table) have been tested and found no better than the current BT4.

What do you think of it?

Waiting for the comparison with 'lzip -0', my first impression is that it is not worth the trouble of breaking lzip's reproducibility.

Best regards,

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