hmmm, in a situation where your asking for the server to execute untrusted, unknown code (to test for effiency of course) a wrapper would not be the answer...A wrapper is in most cases some type of frontend..a frontend that takes requests and looks at it and executes somthing else based on that request..or somthing like that..In this case, which I still dont think is a good idea, a highly restricted chrooted enviroment for the code to run in would be the answer...but still, not a good enough answer :)