[arch-dev-public] [PATCH] Support xz compressed packages

[Thomas Bächler]

Am 16.02.2010 12:03, schrieb Jan de Groot:
> Did some testing with openoffice-base 3.2.0-1-x86_64.tar:
> compression speed:
> gzip:  0m28.945s
> bzip2: 1m21.876s
> xz -1: 0m49.244s
> xz -2: 1m18.444s
> xz -3: 3m34.208s
> xz -6: 4m41.148s
> 
> decompression speed:
> gzip:  0m 5.772s
> bzip2: 0m29.433s
> xz -1: 0m13.983s
> xz -2: 0m12.949s
> xz -3: 0m12.706s
> sz -6: 0m11.462s
> 
> size:
> tar:   370728960
> gzip:  173262975
> bzip2: 165765469
> xz -1: 157099460
> xz -2: 150147496
> xz -3: 142961984
> xz -6: 129979708
> 
> For decompression, it doesn't matter so much which xz level you choose.
> For compression, anything beyond -2 is painfully slow. These times are
> measured on a Core2Duo E4500 by compressing the single tar file. Note
> that -6 saves a whopping 20MB over compressing with -2, but whatever we
> choose is always better than gzip or bzip2.

We should measure the resident memory usage during decompression because
IIRC that is a problem.

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