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By PHP process pool I m referring to the entire PHP execution process pool on your web server, which determines how many concurrent PHP requests your server can deliver without queuing up requests. The PHP process pool is managed either by Apache+mod_php or some variant of Fastcgi: mod_fcgid, mod_fastcgi, or PHP-FPM (FastCGI Process Manager). The PHP process pool tuning considerations are as follows: Run as many PHP interpreters as memory will allow. If you re running mod_php, then your PHP pool size is the number of Apache child processes, which is determined by the Apache config settings StartServers, MinSpareServers, MaxSpareServers, and MaxClients, which can all be set to the same amount to keep the pool size constant. If you re running a Fastcgi variant, such as mod_fcgid, then your PHP pool size MaxProcessCount, DefaultMaxClassProcessCount, and DefaultMinClassProcessCount, should all be set to the same amount to keep the pool size constant. For an 8GB web server, you may try setting your PHP process pool size to 50, then load test the server by requesting many different Drupal pages with a user client concurrency of 50, and set the think time between page requests of least 1 second per client. If the server runs out of memory and/or begins to scrape swap space, then decrease the number for PHP process pool size and try again. Server load may inevitably climb during such a load load test, but it s not an issue to be concerned with during this tuning test.

Keep as many idle PHP interpreters hanging around for as long as possible.You want to avoid churning your PHP process pool, which means to avoid constantly reaping and re-spawning PHP interpreters in response to the web traffic load of the moment. Instead it s better to create a constant-size pool of PHP interpreters, as many as your server memory can hold, and have that pool size remain constant even if most of those processes are idle most of the time. For mod_php you ll want to set Apache s StartServers, MinSpareServers, MaxSpareServers, and MaxClients all equal to each other, in which case 50 is a decent starting value for an 8GB Drupal web server. This creates a constant-size preforked pool of Apache+mod_php processes. The other key Apache setting for mod_php is MaxRequestsPerChild, which ideally you will want to set at 0 so that Apache does not re-spawn child processes. But if your web server slowly leaks memory over time, and you strongly suspect mod_php is leaking memory, then you may set MaxRequestsPerChild to 10000 or more, and then dial it down until the memory leak issue is under control. For mod_fcgid, if you re experiencing a php-cgi segfault on every 501st PHP request (a known bug in mod_fcgid, which may have already been addressed as of this writing), then you will have to set MaxRequestsPerProcess to 500, which will force each php-cgi interpreter to re-spawn itself every 500 requests. Otherwise, set mod_fcgid MaxRequestsPerProcess to 0 unless php-cgi processes are leaking memory. Also for mod_fcgid, set IdleTimeout and IdleScanInterval to several hours or more to avoid the overhead of re-spawning PHP interpreters on demand.

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The entity is new in the destination model it doesn t exist in the source model and should be added. The entity doesn t exist in the destination model and should be removed. The entity exists in both the source and destination models unchanged and should be copied as is. The entity exists in both the source and destination models but with changes. The mapping tells Core Data how to migrate each source instance to a destination instance. The entity exists in both the source and destination models but with changes. The mapping tells Core Data how to migrate each source instance to a destination instance.

There are several configuration parameters that will help speed the execution of requests for Drupal sites running on an Apache web server. Some of the biggest improvements can be made through the following recommendations.

Note You use http://localhost/admin.php because the only reason your server-side validation will be

The Add, Remove, and Copy types don t generate much interest, because lightweight migrations handle these types of entity mappings. The Transform and Custom types, however, are what make this section of the book necessary. They tell Core Data that each source entity instance must be transformed, according to any specified rules, into an instance of the destination entity. We ll see an example of both a Transform and a Custom entity mapping type in this chapter. If you specify a value expression for one of the entity s properties, the entity mapping is of type Transform. If you specify a custom migration policy for the entity mapping, the entity mapping becomes a Custom type. As you work through this chapter, pay attention to the types the Core Data mapping modeler makes to your mapping model in response to changes you make. To specify the rules for a Custom entity mapping type, you create a migration policy, which is a class you write that derives from NSEntityMigrationPolicy. You then set the class you create as the custom policy for the entity mapping in the Xcode mapping modeler. Core Data runs your migration in three stages: 1. 2. 3. Create the objects in the destination model, including their attributes, based on the objects in the source model. Create the relationships among the objects in the destination model. Validate the data in the destination model and save it.

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