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Re: Delta performance

From: ibej <brane_at_xbc.nu>
Date: 2000-10-09 00:59:41 CEST

>
>
> I think Branko is on Eastern European time, so he probably hasn't seen
> this thread yet.

Branko is on borrowed time right now ... :-(see the mail header)

> Greg Hudson <ghudson@mit.edu> writes:
>
>> Well, I have a little bit of data on differencing performance using my
>> proposed output format. I compared the gcc 2.95 and gcc 2.95.2
>> sources against each other (just the .c files in the gcc subdir), and
>> found:
>>
>> Bytes
>> File-by-file, ours: 15828
>> File-by-file, diff+gzip: 9989
>> Concatenated, ours: 15206
>> Concatenated, diff+gzip: 6015
>
I got similar results, using the vdelta-test program, when the vdelta
window size was smaller than the file size.

I remember comparing gzip with compress-only vdeltas; I got similar
results (say, +-10%) when the vdelta windows were large enough to
accomodate whole files, even though I believe gzip does a much better
job of eliminating redundancies than vdelta is designed to do.

-- 
Brane C(ibej
home: <brane_at_xbc.nu> http://www.xbc.nu/brane/
ACM: <brane_at_acm.org> http://www.acm.org/
Received on Sat Oct 21 14:36:10 2006

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