Change Details

Unconditionally, on all web requests (including api.php, rest.php, load.php, etc.) we create the DBLoadBalancerFactory service in order to inject some request-specific meta data: ```lang=php,name=includes/Setup.php MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->setRequestInfo( [ … ] ); ``` To construct the `DBLoadBalancerFactory` service, it: * creates LBFactory * creates WANObjectCache * creates getStatsdDataFactory * creates and initialises MemcachedPeclBagOStuff {F29860930} Let's look at what these constructors are doing and defer what we can so that the instantiation is a cheap as it can be.

Unconditionally, on all web requests (including api.php, rest.php, load.php, etc.) we create the DBLoadBalancerFactory service in order to inject some request-specific meta data: ```lang=php,name=includes/Setup.php MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->setRequestInfo( [ 'IPAddress' => $wgRequest->getIP(), … ] ); ``` To construct the `DBLoadBalancerFactory` service, it spend 2% of the time doing: * creates LBFactory * creates WANObjectCache * creates getStatsdDataFactory * creates and initialises MemcachedPeclBagOStuff {F29860930} And to compute `WebRequest::getIP` it spends another 1%: {F34432738} Let's look at what these constructors are doing and defer what we can so that the instantiation is a cheap as it can be.

Unconditionally, on all web requests (including api.php, rest.php, load.php, etc.) we create the DBLoadBalancerFactory service in order to inject some request-specific meta data: ```lang=php,name=includes/Setup.php MediaWikiServices::getInstance()->getDBLoadBalancerFactory()->setRequestInfo( [ 'IPAddress' => $wgRequest->getIP(), … ] ); ``` To construct the `DBLoadBalancerFactory` service, it spend 2% of the time doing: * creates LBFactory * creates WANObjectCache * creates getStatsdDataFactory * creates and initialises MemcachedPeclBagOStuff {F29860930} And to compute `WebRequest::getIP` it spends another 1%: {F34432738} Let's look at what these constructors are doing and defer what we can so that the instantiation is a cheap as it can be.