memcache - lightning fast object retrieval

Memcache Lightning fast object retrieval

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Site too slow?

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Can’t serve all requests?

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Memcache may be for you.

But maybe not.

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• Spare memory?

• webserver

• fileserver

• database server

Do you have spare resources?

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What’s cheapest to add?

• More webservers?

• More database servers?

• More memory servers?

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Memory servers are cheap

• You may have spare memory on your network

• Memory servers don’t need hard disks

• Memory servers don’t need fast CPUs

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Memory cache can turn down the heat

• Less PHP processing

• Fewer database queries

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Advantages of Memcache

• Memory based and fast

• Keys and bytes (anything goes in)

• Cache things only once

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Redundant caches

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Single shared cache

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What do you need?

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Memcached server

http://danga.com/memcached/

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Memcache PECL extension

http://pecl.php.net/package/memcache

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Spare memory.4MB - nGB

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Memcache Drupal module

http://drupal.org/projects/memcache

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Memcache Drupal module

• A module

• An include file /includes/memcache.inc

• Patches

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Why do you need patches?

• We’re caching things that Drupal normally doesn’t cache

• Built nodes

• Taxonomy terms, vocabularies, trees

• Comments

• Paths

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Who should use memcache?

• A personal blog (Apache, MySql on one box)

Page requests went from 400ms to 100ms

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Large Media site

• Handles yearly spikes by adding a cluster of memcache servers during the spike

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Soon to come

• Admin section

• Statistics

• Clustering

• Bins

• Greater abstraction at the Drupal cache layer

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