Re: [OT] zip [WAS: GNU Octave 4.0.1 Released]

[Tatsuro MATSUOKA]

> From: Philip Nienhuis 

> To: Tatsuro MATSUOKA ; "octave-maintainers
> Cc: @
> Date: 2016/3/25, Fri 20:19
> Subject: [OT] zip [WAS: GNU Octave 4.0.1 Released]
> 
>T atsuro MATSUOKA wrote:
>>  ----- Original Message -----
>> 
>>>  From: PhilipNienhuis
>>>  To: octave-maintainers
>>>  Cc:
>>>  Date: 2016/3/25, Fri 16:52
>>>  Subject: Re: GNU Octave 4.0.1 Released
>>> 
>>>  John W. Eaton wrote
>>>>    The Octave developers are pleased to announce the release
>>>>    of GNU Octave, version 4.0.1.
>>>> 
>>>> 
>>>>    <snip>
>>>>    An official Windows binary installer is also available from
>>>>   ftp://ftp.gnu.org/gnu/octave/windows
>>> 
>>>  Thanks.
>>> 
>>>  Just curious:
>>>  The Windows "zip" is 256 MB and the Windows installer 182 MB.
>>>  Does the NSIS installer invoke such  superior compression?
>>> 
>>>  Philip
>> 
>> 
>>  I feel that zip is an out dated compression application.
> 
> Quite, yes :-)
> 
>>  Compression ratio of many installers is higher than that of zip.
>> 
>>  However, as you know, zip is an only compression application that bundled 
> with windows.
> 
> You mean the "zip" ("Send to... compressed folder") built 
> into Windows 
> explorer?  As to compression it's performance is, well, sub-optimal.
> Zipping up the installed octave-4.0.1 tree (32 bits + octclip package) 
> to a .zip archive:
> - MSYS zip: 322 MB (not bad... but doesn't open in Windows Explorer)
> - 7-Zip   : 337 MB (hmmm... I expected better)
> - Explorer: 348 MB (not unexpectedly the worst)
> 
What compression algorithm do you use for 7-zip?
The compression ratio of 7-zip depends on the algorithm.

Default setting of windows 7zip file manager uses lzma compression and
high compression ratio is accomplished.

I compressed the octave-4.0.1 install folder three methods

zip bundled with windows: 
 356,545,692 byte
zip on msys on octave (zip -mro9):
 352,808,872 byte
7 zip with the lzma algorithm
 184,109,838 byte

7zip with lzma algorithm is far effective for compression.

Tatsuro