Using memcache to improve php performance

May 28, 2010Download as pptx, pdf

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Using Memcache to improve PHP performance. Memcache is an open source, high-performance distributed memory caching system that can speed up dynamic web applications by reducing database load. It stores data in RAM for fast access and allows setting and getting of key-value pairs. The client libraries for Memcache provide methods for connecting, setting, getting, and deleting cached items. Common uses of Memcache include caching query results, API responses, and throttling user activity to improve performance.

Technology

Using Memcache to improve PHP performanceSudar Muthu (@sudarmuthu)http://sudarmuthu.comResearch EngineerYahoo ResearchBangalore PHP user group29-May-2010

AgendaOverviewMemcache PrinciplesHow Memcache worksGeneral UsageMemcache LimitsClient LibrariesCommon Use casesTips for optimizationUsing Memcache in WordPress

OverviewA high-performance Distributed Memory Object Caching SystemIntended for speeding up dynamic web applications by alleviating database load.Open source & distributed under a “permissive free software licence”.Uses RAM for storage Acts as a dictionary of stored data with key /value pairs

Memcache PrinciplesIt is not a databaseIt does not provide redundancyIt doesn't handle failoverIt does not provide authenticationIt does not allow locksNo direct dump or backup possible

How Memcache worksTwo stage hash, like a giant hash table looking up key=value pairsClient hashes the key against a list of servers When the server is identified, the client sends its request Server performs a hash key lookup for the actual data

General UsageFirst look up in memcache before querying the database.If present, return it.Else query the database, store it in memcache and return it.If the data changes, delete it from cache.

Memcache LimitsA single value cannot contain more than 1 MB of data.A single key cannot be more than 250 characters in length.Normally a single memcache instance cannot be more than 2 GB in size.

Client LibrariesPerl, Python, Ruby, Java, C#, CPostgreSQL (access memcached from procs and triggers)MySQL (adds memcache_engine storage engine)PHP (pecl/memcache)

Client Libraries – PHP APIKey MethodsboolMemcache::connect ( string $host [, int $port [, int $timeout ]] )

boolMemcache::set( string $key , mixed $var [, int $flag [, int $expire ]] )

string Memcache::get ( string $key [, int &$flags ] )

boolMemcache::delete ( string $key [, int $timeout ] )More: http://www.php.net/memcache

Common Use cases - 1Simple query result caching$key = ”some:unique:key"; if ($memcache‐>get($key)) { return $memcache‐>get($key); } else { // Run the query get the result data $result = $db‐>query(“query”); $memcache‐>set($key, $result, TRUE, 300); // Store the result of the query for 5 minutes return $result; }

Common Use cases - 2Caching network/webservice calls$key = ”some:unique:key"; if ($memcache->get($key)) { return $memcache->get($key); } else { // Download the page $url = ”Your webserviceurl"; $result = fetch($url); $memcache->set($key, $result, false, 86400); // Store the result of the query for a day return $result; }

Common Use cases - 3Throttle user activity $key = “some:unique:key”; if ($memcache->get($key)) { //Deny access return false; } else { $memcache->set($key, “1”, false, 60); //Allow access return true; }

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This document summarizes the capabilities and specifications of various Arduino boards. It describes the different types of Arduino boards including the Uno, Leonardo, Due, Mega, Arduino BT, LilyPad, Arduino Pro, and ADK. It provides details on the microcontrollers, operating voltages, memory, and input/output pins of the Uno/Leonardo and Due. It also outlines the pin mappings, external interfaces, ways to interface with external boards, and examples of projects the author has implemented with Arduino boards.

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Sudar Muthu discusses controlling robots using JavaScript in conjunction with Arduino, primarily utilizing the node-serialport library for communication. He highlights various techniques for interfacing, including Bluetooth connections and sensor data readings, while demonstrating practical coding examples. The presentation aims to engage software developers to explore hardware through accessible tools and frameworks like Johnny-Five.

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Using memcache to improve php performance

1. Using Memcache to improve PHP performanceSudar Muthu (@sudarmuthu)http://sudarmuthu.comResearch EngineerYahoo ResearchBangalore PHP user group29-May-2010

2. AgendaOverviewMemcache PrinciplesHow Memcache worksGeneral UsageMemcache LimitsClient LibrariesCommon Use casesTips for optimizationUsing Memcache in WordPress

3. OverviewA high-performance Distributed Memory Object Caching SystemIntended for speeding up dynamic web applications by alleviating database load.Open source & distributed under a “permissive free software licence”.Uses RAM for storage Acts as a dictionary of stored data with key /value pairs

4. Memcache PrinciplesIt is not a databaseIt does not provide redundancyIt doesn't handle failoverIt does not provide authenticationIt does not allow locksNo direct dump or backup possible

5. How Memcache worksTwo stage hash, like a giant hash table looking up key=value pairsClient hashes the key against a list of servers When the server is identified, the client sends its request Server performs a hash key lookup for the actual data

6. General UsageFirst look up in memcache before querying the database.If present, return it.Else query the database, store it in memcache and return it.If the data changes, delete it from cache.

7. Memcache LimitsA single value cannot contain more than 1 MB of data.A single key cannot be more than 250 characters in length.Normally a single memcache instance cannot be more than 2 GB in size.

8. Client LibrariesPerl, Python, Ruby, Java, C#, CPostgreSQL (access memcached from procs and triggers)MySQL (adds memcache_engine storage engine)PHP (pecl/memcache)

9. Client Libraries – PHP APIKey MethodsboolMemcache::connect ( string $host [, int $port [, int $timeout ]] )

10. boolMemcache::set( string $key , mixed $var [, int $flag [, int $expire ]] )

11. string Memcache::get ( string $key [, int &$flags ] )

12. boolMemcache::delete ( string $key [, int $timeout ] )More: http://www.php.net/memcache

13. Common Use cases - 1Simple query result caching$key = ”some:unique:key"; if ($memcache‐>get($key)) { return $memcache‐>get($key); } else { // Run the query get the result data $result = $db‐>query(“query”); $memcache‐>set($key, $result, TRUE, 300); // Store the result of the query for 5 minutes return $result; }

14. Common Use cases - 2Caching network/webservice calls$key = ”some:unique:key"; if ($memcache->get($key)) { return $memcache->get($key); } else { // Download the page $url = ”Your webserviceurl"; $result = fetch($url); $memcache->set($key, $result, false, 86400); // Store the result of the query for a day return $result; }

15. Common Use cases - 3Throttle user activity $key = “some:unique:key”; if ($memcache->get($key)) { //Deny access return false; } else { $memcache->set($key, “1”, false, 60); //Allow access return true; }

16. Tips for OptimizationPre warm your cache using scripts Batch your requests using multi-get values= get(Array(“Foo”,”Bar”,”Baz”))Cache things other than SQL data! XML, HTML, Page fragmentsReplicate data across clustersDo set/delete in multiple clusters  Read from either clusterRun multiple instances on the same serverIf you know the data, implement a simple encoding scheme

17. Using Memcache in WordPressDownload Memcached Object Cache Plugin from http://wordpress.org/extend/plugins/memcached/Set up memcached serversInstall peclmemcacheextentionCopy object-cache.php to wp-content directory (not the Pluing’s directory)You are done 

18. Questions?Thank you

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