I think Kristina Marasovic wrote: [Charset iso-8859-1 unsupported, filtering to ASCII...] > Hi, > > can someone tell me if it is possible (and how) to get or to measure the > size of an activation record.
You don't really know the size of *any* Java object, as the details of object representation are implementation-dependent. Furthermore, it's rather tricky to determine "the size of an object" when that object is part of a dense interconnected web of objects like Jess's Rete network. That said, in the current implementation, an Activation object has 4 members, which at 4 bytes each is 16 bytes. Along with the generally-assumed Java memory overhead per object of 16 bytes, that means each Activation is 32 bytes. If you have 756,000 of them, that's 24 MB. If you include the 4 byte array element that holds each Activation, then that adds another 3 MB. Now, each Activation record has a reference to a Defrule (which would exist anyway) and a Token in the Rete network. If you want to start including those Tokens in the memory count, then it becomes very complicated very quickly, as many, many Tokens are shared, and also Token is a recursive data structure -- a Token usually contains a reference to another "parent" token. The depth of the recursion and the amount of sharing is entirely dependent on the nature of your rules. --------------------------------------------------------- Ernest Friedman-Hill Advanced Software Research Phone: (925) 294-2154 Sandia National Labs FAX: (925) 294-2234 PO Box 969, MS 9012 [EMAIL PROTECTED] Livermore, CA 94550 http://herzberg.ca.sandia.gov -------------------------------------------------------------------- To unsubscribe, send the words 'unsubscribe jess-users [EMAIL PROTECTED]' in the BODY of a message to [EMAIL PROTECTED], NOT to the list (use your own address!) List problems? Notify [EMAIL PROTECTED] --------------------------------------------------------------------
