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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Poll for the users of ZLib-Ada
Date: Tue, 15 Mar 2016 16:55:28 -0500
Organization: JSA Research & Innovation
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<gautier_niouzes@hotmail.com> wrote in message 
news:c1750db2-cf38-404b-9722-71bd0cae115a@googlegroups.com...
>> I think we use whatever the default is.
>> We use it to zip logfiles after they grow too large.
>> I guess we are happy with teh level of compression we get,
>> I don't think there has ever been a question raised
>> addressing the level.
>
> Good to know. So far nobody seems to be interested in low Deflate 
> compression levels, which is a good thing for me: less work for the 
> upcoming Zip-Ada version, and for a future ZLib-Ada replacement derived 
> from Zip-Ada as well :-).
> I've added *.ldf, *.mdf and *sql filters to the testing script.

Wasn't the purposes of those lower levels to use less CPU time and space? 
But that hardly matters anymore, because the difference between 0.010 sec 
and 0.022 sec isn't noticable (CPUs are 1000x), and we have oceans of memory 
compared to the 1980s when ZIP was invented.

They probably need to exist because of compatibility with old ZIP files, but 
even in the 1980s I don't think they were used much (I don't recall ever 
using them on purpose, although I think PKZip would sometimes decide to use 
them itself for whatever reason).

                                    Randy.

                                     Randy.