Template caching in Lucee

[John Blayter]

In CF9's template caching and it seems that after a CFM/CFC gets compiled into a class file that it seems to toss that into the PermGen memory in Java. This makes it super hard to push code to a high traffic server without user impact. We've gotten better at it but still throws off some users.

As we dive into Lucee we are wondering how the Lucee saves these java files and loads them into memory for performance caching.

What are the best settings for caching templates on a high traffic server?

When we push out new code how does Lucee recognize that?

What is the best workflow in your opinion of using the PagePoolClear() function? I assume this is the trigger that clears those cached templates

[Igal @ Lucee.org]

In CF9's template caching and it seems that after a CFM/CFC gets compiled into a class file that it seems to toss that into the PermGen memory in Java. This makes it super hard to push code to a high traffic server without user impact. We've gotten better at it but still throws off some users.

you should configure the Java Agent, which will allow Lucee to re-use the class files rather than toss away the whole class loader tree.  also, consider upgrading to Java 8 which does not have the PermGen model anymore, and therefore works much more efficiently and reliably.

As we dive into Lucee we are wondering how the Lucee saves these java files and loads them into memory for performance caching.

Lucee creates a .class file and saves it to /WEB-INF/lucee/cfclasses/{path-based-on-original-path}

When we push out new code how does Lucee recognize that?

that depends on your settings.  for files that are inspected once or always, the timestamp on the class file is compared with the timestamp of the source file.  for files that are never inspected you have to refresh manually

What is the best workflow in your opinion of using the PagePoolClear() function? I assume this is the trigger that clears those cached templates

PagePoolClear() is a good way to handle it, yes.  another way is via the Admin under Performance/Caching and clicking the button labeled "Clear Page Pool Cache".  you can always add something like this to the beginning of your Application.cfc's onRequestStart():

function onRequestStart() {

  if (CGI.REMOTE_ADDR == "127.0.0.1")    // overly simplified for example purposes
      if (URL.keyExists("refreshCode"))
          PagePoolClear();

  // more code here
}

then call your app with ?refreshCode from an allowed IP

Igal Sapir
Lucee Core Developer
Lucee.org

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