Deflate: And then there is Chipz

By Pierre R. Mai on June 5, 2009 12:50 AM | | TrackBacks (1)

So it seems the best way of finding out about lisp packages is releasing a similar package yourself ;): Right on the foot of releasing Deflate, I get to notice Chipz, a similar, but more capable package by Nathan Froyd, the release of which in early 2008 seems to have slipped my notice completely. So anyone who is interested in RFC 1951 Deflate (or even BZIP2 decompression), please have a look at Chipz as well, which is likely to better fit your needs!

Since I can’t let any benchmarking opportunity go to waste, here’s an overview of performance when decompressing a 18.6MB gzip-compressed file into 81.9 MB uncompressed form with Deflate 1.0.0, Chipz 0.7.3 and inflate.cl from Franz, version 2.6, on various CL implementations, and gzip 1.3.10:

Common Lisp
Implementation		Library / Program
Deflate 1.0.0 Chipz 0.7.3 inflate.cl 2.6
(w/o CRC32)		 Deflate 1.0.0
w/o CRC32		 Chipz 0.7.3
w/o CRC32		 gzip 1.3.10
SBCL 1.0.29 x86 (32bit) 7.42s 7.65s 17.85s 6.56s 6.99s 5.03s
SBCL 1.0.29 x64 (64bit) 6.99s 6.41s 18.35s 6.37s 5.92s
LispWorks 5.1.2 Prof. 32bit 34.78s 197.50s 32.68s 34.02s 56.79s
Clozure CL 1.3 32bit 44.89s 48.77s 13.53s 16.07s 17.71s
Clozure CL 1.3 64bit 18.06s 16.87s 13.67s 16.87s 15.40s

Since CRC-32 calculations can overshadow deflate performance itself on some implementations, and since inflate.cl does not perform CRC-32 checksum calculations at all, the columns showing Deflate and Chipz without CRC-32 calculations might be more indicative of actual deflate performance.

Note that this was all done on a MacBook Air 1.8GHz Core2 Duo under Mac OS X 10.5.7, timing was done as an average of 3 runs each.

What can be learned from the results is that 64bit implementations with their bigger fixnum range help quite a bit in performing 32bit algorithms (like CRC-32) well even without extensive/effective declaration fine-tuning or special 32bit arithmetics operators.

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» (Yet Another) Deflate Decompression Implementation in CL from Pierre R. Mai's Miscellany

I have finally gotten around to separating out and cleaning up the Deflate (RFC 1951) decompression routines we have been using in-house for quite some time, and released them under an X-style free license (see links below), for those who... Read More

Tracked on June 5, 2009 1:18 AM

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