[Sidefx-houdini-list] bgeo.gz and gzip with windows
edward at sidefx.com
Fri Jun 20 09:00:15 EDT 2008
7zip is more like a "container format" where the default compression is
> 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.
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