[Sidefx-houdini-list] bgeo.gz and gzip with windows
paul at realisestudio.com
Fri Jun 20 10:54:24 EDT 2008
hey chris - a very useful table for sure! thx for sharing. i hope
that sesi are listening in and maybe can include lzma in the default
houdini distro. btw, how did they compare with (de)compression times?
2008/6/20 Edward Lam <edward at sidefx.com>:
> 7zip is more like a "container format" where the default compression is
> 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.
>>>>> 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
>>>> 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
>>> 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.
>>> Sidefx-houdini-list mailing list
>>> Sidefx-houdini-list at sidefx.com
>> Sidefx-houdini-list mailing list
>> Sidefx-houdini-list at sidefx.com
> Sidefx-houdini-list mailing list
> Sidefx-houdini-list at sidefx.com
More information about the Sidefx-houdini-list