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

Edward Lam edward at sidefx.com
Fri Jun 20 09:00:15 EDT 2008


7zip is more like a "container format" where the default compression is 
LZMA.

-Edward

jiversen wrote:
> 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
>> _______________________________________________
>> Sidefx-houdini-list mailing list
>> Sidefx-houdini-list at sidefx.com
>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>   
> _______________________________________________
> Sidefx-houdini-list mailing list
> Sidefx-houdini-list at sidefx.com
> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list




More information about the Sidefx-houdini-list mailing list