[wplug] compression

Michael Semcheski lists at immuneit.com
Fri Apr 15 00:00:20 EDT 2005


Bryon Gill wrote:
> The Quicktime file was already heavily compressed, so it spent a lot of
> effort for negative gain.  Try again with a more compressible file (an
> enormous text file for instance) and see if you don't get better results.

Read the rest of the message...  At some point, and 100Mb is clearly
past that point, compression is detrimental even with something highly
compressible, like text.

>> So lzw compression does not do a lot for movie files.  Everybody knew
>> that.  My next test I took about 250Mb of tar'd php applications (so
>> there were some image files, but it was mostly text).  Gzip was able to
>> compress it about 60%, (though I didn't use the gzipped file in my
>> tests).
>>
>> Without compression, it took 28 seconds (8MB/sec).
>> With compression, it took about 50 seconds (4.7MB/sec).
>>
>> So compression over the 100Mb network slowed things considerably.

Mike


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