Changing dpkg-deb default compression from gzip to lzma for Hardy
T.Six at gmx.de
Tue Dec 18 00:09:03 UTC 2007
Kristian Erik Hermansen wrote the following on 17.12.2007 23:56
> We are talking about a 10x increase in the time it takes to create
> DEBs if moving from gz -> lzma. Is this acceptable?
deb creation aka compression shouldn´t bother us as much as installing aka
buildds should have enough power for that (given ubuntu delivers only for
> Also, it is more
> than doubling the work placed on the installer's CPU.
also note the package size went down from
gz: 39084 real 0m14.278s
7z: 27358 real 2m23.783s
which means ~30% less download time during a security update, which in turn
means ~30% less cost for that update.
currently i am on a 384kbit/s line.
comparation of a whole install (download time + extract time):
download time gz (39084/384)= 101.78s + 14.278s = 116.06s
download time 7z (27358/384)= 71.24s + 143.783s = 215.02s
So i think it depends on the goal we would like to reach:
1. less package size = less time spending downloading
2. cpu cycles = compress/extract time (both buildd and user pc)
depending on who you ask i think the answer will be quite different.
Someone on a modem line will much appreciate the 30% less time downloading
(7z), someone with a fat DSL cable and weak cpu will tend to prefer gz.
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