[Sidefx-houdini-list] bgeo.gz and gzip with windows

jiversen jiversen at rhythm.com
Thu Jun 19 17:27:46 EDT 2008

Hi there,

How does 7zip perform?  I think it's pretty slow on creating one but not 
bad on decompression (where it's most important).

Chris AtLee wrote:
> Pablo Giménez wrote:
>> 2008/6/17 Nicholas Pliatsikas <nick_p102 at hotmail.com>:
>>> Does anyone know the full benefits of using bgeo.gz? I.e I know the files
>>> sizes are smaller, meaning less network traffic and uses less space on our
>>> servers. But would complex setups with geos writing in houdini or delayed
>>> read archives rendering through mantra require more time to process?
>>> Just so we can access if its worth looking into this further at the moment.
>>> Cheers
>>> Nicholas Pliatsikas
>> Yes, if you are dealing with big geometry files using gz is really good, but
>> in my experience bzip2 is really good, I have seen ratios very clos to 1:8
>> in the size, bgeo is binary so bzip2 works much better on this kind of
>> files.
>> I think there is a version of bzip2  for windows.
>> The only problem I have experienced using compressed files is rendering from
>> file, but this was on version 8, I don´t know if this have been solved in
>> version 9.
> LZMA is also an option.  It performs significantly better than bz2, and
> is also faster to decompress than bz2.
> I ran a test against about 7000 bgeo files here, here's a summary of my
> results:
> Compression Method      gzip     bzip2     lzma
> Average Compression
>   (% of original size)  45.74    47.78     34.76
> Best compression ratio
>   (% of original size)   7.22     4.50      2.20
> Worst compression ratio
>   (% of original size) 136.00   137.14     93.50
> Standard Deviation       0.18     0.23      0.17
> So, for the files that I was testing, bz2 is in fact not a good choice
> to use.  It performs worse on average than gzip and has more varied
> behaviour.  lzma is a clear winner here.  I didn't measure the
> compression times for the different methods here, but other reports
> online indicate that lzma is slower than gzip, but faster than bz2.
> I know lzma is available for Linux, and it looks like the LZMA SDK
> includes lzma.exe for Windows, but I haven't tested it.
> Cheers,
> Chris
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