Compression Level

2004-02-03
2004-03-20
  • Ilia Alshanetsky

    It seems that recently the compression level was made a configurable setting and set to the lowest compression level by default.

    Why was this done?

    Since content caching is done once, it seems to me using the highest level of compression (9) would be better as it would ensure smallest page sizes and save on the amount of disk/memory needed to store it.

     
    • David

      David - 2004-02-17

      I agree, unless you have a website who gets hundreads or thousands page views per secs, where caching for even 1 second can help, those peoples may need to lower the compression level

      But for in most case, level 9 work best
      Btw, *IF* i remember correctly, MMCache have some short of caching feature via ETag: keep in mind that IE is unable to cache any gzipped content

       
    • Ilia Alshanetsky

      Even in the instances when your server is sending A LOT of requests the benefit of compression (serving smaller file many time) far out weigh the extra 1/10th of a second that it would take to compress the content better.

       
    • Jason Sheets

      Jason Sheets - 2004-03-19

      The default compression level was previously hard coded to 7,  the next release will have a configuration option to to allow you to alter this value but it will continue to default to 7.

      After 7 the CPU Load to compression ratio is not as favorable so again the default compression level by default will remain unchanged but will be user configurable.

       
    • David

      David - 2004-03-20

      Wasn't it 6? ;)

       
    • Jason Sheets

      Jason Sheets - 2004-03-20

      It is possible it was set to 9, in any case when the next version of MMCache is released the compression level will default to the level of 2.4.6 and the configuration option will allow you to change it if desired.

       
      • David

        David - 2004-03-20

        Oh yes, it was indeed at 9
        mod_gzip/PHP zlib have it at level 6 by default

        Anyhow, since the compression is done once, wouldn't having level 9 best? (Even if the saving is minimal)

         

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