On Tuesday 21 July 2009, Vikesh Bhoola wrote:
> On the topic of bzip2 (as alternative to UNZIP MVS/cmsmvs version):
> ==================================================================
>
> On Friday 17 July 2009, Bob Woodside wrote:
> >Vikesh --
> > Would a version of bzip2 help you out for the time being? I had
> > just
> >
> >done a z/OS USS port of the latest version (1.0.5) earlier this
> > week, before you reported the unzip problem. It supports large
> > files, and appears to be working well. I think it might work for
> > you in conjunction with Kirk's utilities.
>
> Bob, I've tested bzip2 version (1.0.4) which came with our latest
> order of "IBM Ported Tools".
> I've found it to be at least 4 time slower in comparison to Info-ZIP.
> Not sure how bzip2 verion 1.0.5 compares to Info-ZIP?
I would expect bzip2 to be slower, but maybe not this much. The
Ported Tools version is probably not aggressively optimized.
bzip2 is known to be fairly slow at compressing, and pretty fast at
decompressing. My results with my build of bzip-1.0.5, compiled with
max optimization, are:
compression: about 2.5 times slower than zip
decompression: about the same as unzip
These tests were done using the -9 (max compression) option in bzip2,
and the default compression level in zip - so there's a slight
inconsistency.
Cheers,
Bob
--
Bob Woodside
Woodsway Consulting, Inc.
http://www.woodsway.com
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