ColdFusion Memory Leak, you think?

February 29, 2008 at 5:56 am Leave a comment

Got lots of memory consumption and have no idea where it’s going? Thinking it might be a memory leak in ColdFusion MX?

One of the first things you should look at is the amount of session variables you set. If you have the session timeout set high and/or you create some large objects in the session scope, you_have_to_remember that these session variables are created for EACH request when a client does NOT accept cookies.

Why? Because upon each request ColdFusion thinks that it is a new client, it doesn’t see a cookie so it must be a new client.

Ways to overcome this are:

         setting URL tokens; not recommended.

         Store the IP in the application scope (you can create a hash of IP and USER AGENT as well) and keep track of the clients you cannot set a cookie for. Based upon this information you can decide whether to set the session variables again in following requests.

Situations where this will most likely occur are when bots or email harvesters spider the site without accepting cookies.

 You can put some of the logic in onSessionStart, this method is called each time a new session is created. If a client does not accept cookies, a new session will be created for each request.

Entry filed under: ColdFusion. Tags: , .

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