Scaling with memcached

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memcached is a high-performance, distributed memory object caching system used by LiveJournal, Facebook, Bloglines and others. Find out how memcached works, how to it set up and how you can scale your website. Presented at YAPC::Europe 2007 by Leon Brocard.

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  • Dear Leon,

    I'd be curious to see an apples to oranges comparison between Danga's open source Memcached and enhanced versions like Gear6.

    Any chance you've got something like that in your bag of presentations?
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  • Maybe I wasn't clear enough: having pointed out earlier that cache invalidation is a bad idea, I say disable caching for testing. However, if you have complicated cache invalidation then clearly you'd want to test it.
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  • Hi Léon,
    Why disable? Disabling memcached when testing might as well bite you in the ass once in production. Let's say for instance that the cache invalidation logic is wrong in tested code, the test might fail because it will serve some data from the cache instead of the store. *which is good*.
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Scaling with memcached

  1.    acme@astray.com ::
  2. 
  3.   ●  ●
  4.   ●  
  5. 
  6.   ●  ●  ? ●
  7. ?  ●    ●
  8.   ●  ●
  9.  :: ●  ●  ●  ●
  10. _  ●  ●
  11.   ● :: ●  ●
  12.   ●  ●  ●
  13.   ●  ●  ●  ●
  14.   ●  
  15. ?
  16.   ● 
  17.   ●  ●  ●   ●
  18.   ●  ●  ●  ●  ● : ●
  19.   ●  ● # ● 
  20.   ●   ●  ●
  21.   ●  ●  ●
  22.   ● 
  23.  =:: ● >=> ':'; >''''; ● =>''; ●
  24.   ●  ●  ● 
  25.  _ ● =_; =>; ; = >__; >“:” *; ; 
  26.  ' ●  ●
  27.  ' ● ' ●  ●  ●  ●  ●
  28.   ●  ● : ● : ●  ●
  29.  >':'; ●  ●  ●
  30.   ●   ●  ●
  31.   ●  ●  ●
  32. ?  ●  ●  ●  ● 
  33. ?  ●  ●   ●
  34.   ●  _ ● : ●
  35. ? ' ●  ●   ●
  36.   ●  _
  37.   ●      _ _ _ _  _ _ _ _ _ _ _ _ _ _ 
  38.  _ ● _ _ _ =__ ●  ●
  39.  : ● : ●
  40.   ●
  41.   ●
  42.   ●  –  ●  –  ●  –
  43.   ●   : ● :: ●

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