LZMA Dictionary Size effects

Mad Doggie · 17th April 2004, 12:39

I'm curious as to the effect of different LZMA dictionary sizes. I am currently using 32MB - I have 1GB of RAM on the box I compress my installers with, and my users are all running MS Flight Simulator - which uses more RAM than my installers ever will.

Is there any benefit to such a large dictionary size? Even if it makes 5% difference it's a good tradeoff for me.

On another note, is there another compression method (7zip?) that we're planning on adding that's better than LZMA?

Joost Verburg · 17th April 2004, 12:42

LZMA is the default 7-zip compression method.

A higher dictionary size will increase memory requirements but may compresses a little bit better.

It all depends on the type of data, so just try what difference it makes.

17th April 2004, 12:39	#1
Mad Doggie Junior Member Join Date: Sep 2003 Location: Roswell, GA Posts: 44	LZMA Dictionary Size effects I'm curious as to the effect of different LZMA dictionary sizes. I am currently using 32MB - I have 1GB of RAM on the box I compress my installers with, and my users are all running MS Flight Simulator - which uses more RAM than my installers ever will. Is there any benefit to such a large dictionary size? Even if it makes 5% difference it's a good tradeoff for me. On another note, is there another compression method (7zip?) that we're planning on adding that's better than LZMA?

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17th April 2004, 12:42	#2
Joost Verburg NSIS MUI Dev Join Date: Nov 2001 Posts: 3,717	LZMA is the default 7-zip compression method. A higher dictionary size will increase memory requirements but may compresses a little bit better. It all depends on the type of data, so just try what difference it makes.