Re: Adding slice-by-4 and slice-by-8 to CRC32

[Bruno Haible]

Sam Russell wrote:
> I built from HEAD, named it gzip_vanilla, rebuilt with my CRC code and
> named it gzip_8_slice. Input file is a 115MB file gzipped (default
> settings) to 61M

Thanks; that's a comparison from which one can draw conclusions.

> sam@DESKTOP-R64B0KJ:~/gziptest$ time ../code/gzip/gzip_8_slice -k -d -c
> large_file.gz > /dev/null
> 
> real    0m0.319s
> user    0m0.316s
> sys     0m0.000s
> sam@DESKTOP-R64B0KJ:~/gziptest$ time ../code/gzip/gzip_vanilla -k -d -c
> large_file.gz > /dev/null
> 
> real    0m0.485s
> user    0m0.484s
> sys     0m0.000s
> 
> Looks to be about a ~35% reduction in time

Wow! That's impressive.

Definitely worth pursuing.

Bruno