Topic: Computers Compression

(link)

10:00am, Thursday 16 February 2006

I just found out about rzip and 7zip, new-ish file compression utilities. Being obsessive about performance and statistics and stuff, I ran a few tests: all these required the compressor to produce its "best" (most compressed) output.

compressorsize of compressed file (%)CPU time (s)
gzip48.91.38
bzip246.112.4
rzip45.217.2
7zip43.128.2

So gzip is far, far away the fastest (which explains its continued widespread use) but using one of the others could save significant amounts of space with very large files - if you have the time to spare.

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Dave Holland <dave@biff.org.uk>
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