See the http://www.tcl.tk/man/tcl/ThreadCmd/ttrace.htm%|%manual%|% ---- [AMG]: Is there really only the briefest mention of [[thread::ttrace]] on the Tcler's Wiki? Does no one use this command? It seems like it would be a great way to accelerate initializing many worker threads. Does it live up to that promise? Or does it have some overhead that makes it less attractive than simply loading the required packages into each thread's interpreter? Perhaps it's limited in what it supports, e.g. maybe it doesn't recognize [TclOO]. I see it provides a means to extend its capabilities, and maybe that's good enough. But again, there's no discussion that I can find, so I don't know answers to any of these questions. I'm thinking about trying it out myself to see how it stacks up. <> Package | Threads