Re: Debian Mirror with lzma compressed packages

[Goswin von Brederlow <brederlo@informatik.uni-tuebingen.de>]

A few more examples below. I think lzma isn't the right thing for the
archive. p7zip seems much faster, needs a lot less ram and compression
is similar.

I didn't measure compression times as I find them somewhat
irelevant. A deb is compressed once but downloaded and decompressed a
million times.

System: AMD Athlon(tm) 64 Processor 3200+, 2GHz, 1MB cache, 1GB ram

Gzip: 52569460 Bytes
Compressing  : 19461 mrvn       0  2868  680 R 56.6  0.1   0:02.84 gzip -9
Decompressing: 19395 mrvn       0  3000  512 S  5.0  0.0   0:00.22 gzip -d                     
gunzip-64 < linux-source-2.6.18.tar.gz > /dev/null  2.16s user 0.03s system 98% cpu 2.211 total

gunzip-32 < linux-source-2.6.18.tar.gz > /dev/null  2.31s user 0.03s system 94% cpu 2.481 total


Bzip2: 41877527 Bytes
Compressing  : 19487 mrvn       0 11044 6936 R 78.9  0.7   0:04.14 bzip2
Decompressing: 19392 mrvn       0  7264 4048 R 97.9  0.4   0:04.64 bzcat                       
bunzip-64 < linux-source-2.6.18.tar.bz2 > /dev/null  14.55s user 0.14s system 98% cpu 14.900 total

bunzip-32 < linux-source-2.6.18.tar.bz2 > /dev/null  18.64s user 0.13s system 98% cpu 19.034 total



Lzma: 34306752 Bytes
Compressing  : 19410 mrvn       0  376m 370m R 97.2 36.9   1:58.33 lzma -9
Decompressing: 19488 mrvn       0  100m  79m R 96.8  7.9   0:03.24 lzma

lzma-64 < linux-source-2.6.18.tar.lzma > /dev/null  20.97s user 0.42s system 95% cpu 22.390 total

lzma-32 < linux-source-2.6.18.tar.lzma > /dev/null  24.61s user 0.47s system 98% cpu 25.587 total


p7zip: 36878710 Bytes
Compression  : 19505 mrvn       0 76764  49m S 88.8  4.9   0:08.45 7zr
Decompression: 19546 mrvn       0 33284 6812 S 96.9  0.7   0:04.48 7zr

p7zip-64 -d < linux-source-2.6.18.tar.p7zip > /dev/null  6.38s user 0.41s system 96% cpu 7.010 total

p7zip-32 -d < linux-source-2.6.18.tar.p7zip > /dev/null  7.21s user 0.42s system 96% cpu 7.905 total


MfG
        Goswin