On Dec 28, 2013, at 2:56 PM, Cedric Greevey wrote: > Your requirements are unusual. > > That being said, you might want to consider: > > 1. Using a PRNG with recordable seed, and sane concurrency semantics, to > achieve repeatability -- rerun with same seed to get identical replay of > events. > > 2. If crashes are happening after days, add snapshotting -- some ability to > save the state of the whole simulation from time to time (including current > PRNG state). Use the last snapshot before a crash to investigate the crash. > Requires item 1, above, for rerunning from the same snapshot to produce > unvarying results. > > I'd suggest using a ref world, with a periodically waking thread that does a > (spit (dosync (dump-all-the-refs-to-some-data-structure))) or something. (If > retries become a big problem you'll need to add more coordination, maybe > using core.async to get everything else to take a breather during each state > dump.) You also need order-independence (which suggests a deterministic > breaking up of the world into the domains of different threads, with defined > interaction channels and times, and a separate PRNG per thread -- I'd suggest > a state-dumpable Mersenne Twister instance per thread, seeded at startup > using values from java.util.Random, itself seeded with a known startup seed).
I can see how and why all of the above would work. But it's a pretty big effort, for which I would have no other use, and which would be unnecessary for me if I could just see the values of locals on crashes, as I can with other Lisps. -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
