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Caching and tuning fun for high scalability Wim Godden Cu.be Solutions
Notes about this presentation ,[object Object]
Who am I ? ,[object Object]
Owner of Cu.be Solutions (http://cu.be)
PHP developer since 1997
Developer of OpenX
Zend Certified Engineer
Zend Framework Certified Engineer
MySQL Certified Developer
Who are you ? ,[object Object]
System/network engineers ?
Managers ?
Caching experience ?
Caching and tuning fun for high scalability Wim Godden Cu.be Solutions
Goals of this tutorial ,[object Object]
A few techniques ,[object Object]
How-NOT-to ,[object Object]
5 visitors/day -> 5 million visitors/day
(Don't expect miracle cure !)
LAMP
LAMP
Architecture
Our test site
Our base benchmark ,[object Object]
Result ?
Caching
What is caching ?
What is caching ? select * from article join user on article.user_id = user.id order by created desc limit 10
Caching goals ,[object Object]
Reduce the load ,[object Object],[object Object]
Reduce for Webserver load ,[object Object],[object Object]
Hey, that's frontend !
Theory of caching DB
Theory of caching DB
Theory of caching if ($data == false) DB
Caching techniques ,[object Object]
Blogs
Full pages that don't change
Render -> Store in cache -> retrieve from cache
Caching techniques ,[object Object]
Caching techniques ,[object Object]
Usually a small block in a page
Best effect : reused on lots of pages
Caching techniques ,[object Object]
Caching techniques ,[object Object]
Caching techniques ,[object Object]
Resets on every insert/update/delete
Server and connection overhead ,[object Object],[object Object]
free up DB resources for more hits !
Caching techniques ,[object Object]
Caching techniques ,[object Object]
CPU intensive tasks : ,[object Object]
XML file parsing
Loading CSV in an array ,[object Object]
Caching techniques ,[object Object]
Caching techniques ,[object Object]
Modification frequency ?
Retrieval frequency ?
How to find cacheable data ,[object Object]
Existing projects : ,[object Object]
Make a complete query log (don't forget to turn it off !)
Check page loading times
Caching storage - MySQL query cache ,[object Object]
Don't rely on it
Good if you have : ,[object Object]
few different queries ,[object Object],[object Object]
lots of different queries
Caching storage - Disk ,[object Object]
Caching SQL queries : preferably not
DON'T  use NFS or other network file systems ,[object Object]
high latency
locking issues !
Caching storage - Disk / ramdisk ,[object Object]
Limited number of files per directory ,[object Object],[object Object],[object Object]
-> Hard to scale
How will you keep them synchronized ? ,[object Object]
Caching storage - Memcache ,[object Object]
Distributed memory caching system
Multiple machines ↔ 1 big memory-based hash-table
Key-value storage system ,[object Object]
Values - max. 1Mbyte
Caching storage - Memcache ,[object Object]
Distributed memory caching system
Multiple machines ↔ 1 big memory-based hash-table
Key-value storage system ,[object Object]
Values - max. 1Mbyte ,[object Object]
Memcache - where to install
Memcache - where to install
Memcache - installation & running it ,[object Object]
PECL
Windows : binaries ,[object Object],[object Object]
memcached -d -m <mem> -l <ip> -p <port>
ex. : memcached -d -m 2048 -l 127.0.0.1 -p 11211
Caching storage - Memcache - some notes ,[object Object]
Lose session data
Lose shopping cart data
...
Caching storage - Memcache - some notes ,[object Object]
Lose session data
Lose shopping cart data
… ,[object Object],[object Object]
New : libmemcached (consistent hashing, UDP, binary protocol, …) ,[object Object]
Memcache in code <?php $memcache =  new  Memcache(); $memcache->addServer( '172.16.0.1' , 11211); $memcache->addServer( '172.16.0.2' , 11211); $myData = $memcache->get( 'myKey' ); if  ($myData ===  false ) { $myData = GetMyDataFromDB(); // Put it in Memcache as 'myKey', without compression, with no expiration $memcache->set( 'myKey' , $myData,  false , 0); } echo  $myData;
Let's give that a go ! /** * Retrieves the 10 highest rated articles *  @return  array List of highest rated articles */ static public function  getTopRatedArticleList () { if  ($articleList = $cache->load( 'topRatedArticleList' ) === false) { $articleList =  self :: getTopRatedArticleListUncached (); $cache->save($articleList,  'topRatedArticleList' ); } return  $articleList; }
Where's the data ? ,[object Object]
2 hashing algorithms : ,[object Object],[object Object]
Memcache slabs ,[object Object]
Slab 2 : 480 bytes (400 * 1.2)
Slab 3 : 576 bytes (480 * 1.2) (and so on...) ,[object Object]
Each larger slab has room for fewer items (chunks)
-> Store a lot of very large objects
-> Large slabs might be full
-> Rest of slabs might be free
-> Try to store more -> eviction of data !
Memcache - Is it working ? ,[object Object]
Use Cacti or other monitoring tools STAT pid 2941 STAT uptime 10878 STAT time 1296074240 STAT version 1.4.5 STAT pointer_size 64 STAT rusage_user 20.089945 STAT rusage_system 58.499106 STAT curr_connections 16 STAT total_connections 276950 STAT connection_structures 96 STAT cmd_get 276931 STAT cmd_set 584148 STAT cmd_flush 0 STAT get_hits 211106 STAT get_misses 65825 STAT delete_misses 101 STAT delete_hits 276829 STAT incr_misses 0 STAT incr_hits 0 STAT decr_misses 0 STAT decr_hits 0 STAT cas_misses 0 STAT cas_hits 0 STAT cas_badval 0 STAT auth_cmds 0 STAT auth_errors 0 STAT bytes_read 613193860 STAT bytes_written 553991373 STAT limit_maxbytes 268435456 STAT accepting_conns 1 STAT listen_disabled_num 0 STAT threads 4 STAT conn_yields 0 STAT bytes 20418140 STAT curr_items 65826 STAT total_items 553856 STAT evictions 0 STAT reclaimed 0
Memcache - backing up
Memcache - deleting <?php   $memcache =  new  Memcache(); $memcache->delete( 'myKey' ); $myData = $memcache->get( 'myKey' );  // $myData === false
Memcache - tip ,[object Object]
Naming your keys ,[object Object]
Prefix / namespace your keys !
Only letters, numbers and underscore
md5() is useful ,[object Object],[object Object]
Document your key names !
Updating data
Updating data
Adding/updating data $memcache->delete( 'ArticleDetails__Toshiba_32C100U_32_Inch' ); $memcache->delete( 'Homepage_Popular_Product_List' );

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