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MySQL native driver for PHP: Query cache plugin benchmark impressions
mysqlnd_qc:  Benchmark impressions Ulf Wendel, Andrey Hristov MySQL Connectors Team Sun Microsystems
Table of Contents ,[object Object]
Software ,[object Object],[object Object]
Two machines ,[object Object],[object Object]
Conclusions
Performance art Performance by number of columns and result set size
Hardware / Software ,[object Object]
Apache 2.2.6 (MPM = prefork = default)
PHP 5.3.3-dev
MySQL 5.1.39-debug Source
APC 3.1.3p1
Memcache 1.4.3
libmemcached 0.37
Hardware / Software ,[object Object]
Runs ouf of RAM
Single machine setup ,[object Object],[object Object],[object Object]
Box B running MySQL
Oxid eShop 4.2.0 ,[object Object]
ADOdb Lite, ext/mysql
Smarty
Demo shop frontpage: ~150 database queries
Real-life shop frontpages: >>1k database queries
No practical value? ,[object Object]
No browsing
No ordering
Assumption: all queries can be cached ,[object Object],[object Object]
We show theoretical maximum, only!
bench/qc_load.php ,[object Object]
tests/mysqlnd_qc_perf.php ,[object Object]
<o> bytes total per row ,[object Object],[object Object]
Table of Contents ,[object Object]
Software ,[object Object],[object Object]
Two machines ,[object Object],[object Object]
Conclusions
Oxid, 1 box: PHP/Apache/MySQL CPU bound from 2 clients on, MySQL Server QC wins
Oxid, 1 box: 1 vs. 10 clients absolut Higher impact once CPU bound, MySQL Server QC wins
Oxid, 1 box: 1 vs. 10 clients relative Relative: 200% – 400%, MySQL Server QC wins
MySQLnd QC  Plugin vs. Server QC ,[object Object]
No knowledge of transactions
No knowledge of temporary tables
No knowledge of user variables
No knowledge of MERGE and stuff
No authentification
No protection of cache entries ,[object Object],[object Object]

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