I don't think the link you gave has any information relevant to my question. I'm asking about the global destruction phase of the perl interpreter and whether the mark and sweep destruction of objects that happens as part of that happens at the end of each thread inside a perl process or only at the end of the entire perl process. This link seems to have more to do with memory leaks which are unrelated to my current issue.
"If God had meant for us to think for ourselves he would have given us brains. Oh, wait..."