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2014-10-20T13:18:35Z sam__: Hi!
2014-10-20T13:18:59Z Krystof: hello?
2014-10-20T13:19:02Z sam__: Does the community plan to try out this years gsoc ideas?
2014-10-20T13:19:07Z sam__: I'd like to work.
2014-10-20T13:19:16Z stassats: this year?
2014-10-20T13:19:32Z sam__: I have basic knowledge in Scheme as well as Clojure.
2014-10-20T13:19:48Z sam__: Yeah! gsoc 2014.
2014-10-20T13:20:02Z sam__: The ones which weren't carried out
2014-10-20T13:20:37Z Krystof: there is always more to be done than there is capacity to do it
2014-10-20T13:20:54Z Krystof: if you're offering your time, by all means pick a project that interests you
2014-10-20T13:21:44Z sam__: But I would need someone to mentor me through it.
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2014-10-20T17:29:24Z reb`: I just compiled HEAD SBCL and it hung while running tests ... http://paste.lisp.org/display/144101
2014-10-20T17:30:56Z pkhuong: reb`: can you t a a p backtrace_from_fp($rbp, 100) ?
2014-10-20T17:31:24Z reb`: yes ... what does the "t a a p" mean?
2014-10-20T17:31:34Z nyef: thread apply all print?
2014-10-20T17:31:40Z reb`: ah apply all ...
2014-10-20T17:31:47Z nyef is guessing here.
2014-10-20T17:34:29Z reb`: I annotated the original paste with the Lisp stacks.
2014-10-20T17:35:14Z pkhuong: correct, thread apply all print. it also works directly in gdb
2014-10-20T17:37:20Z reb`: Ubuntu 14.04 ... 64-bit Intel ...
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2014-10-20T17:38:20Z reb`: I have these features turned on: :sb-safepoint :sb-thruption :sb-wtimer
2014-10-20T17:43:25Z pkhuong: only thing I can think of is if we messed up on detecting threads in foreign code.
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2014-10-20T17:57:05Z reb`: I guess I should read the SBCL internals documentation about threads.
2014-10-20T17:58:51Z reb`: What special processing is supposed to be active when threads are inside foreign code?
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2014-10-20T18:00:17Z pkhuong: the nice thing about sb-safepoint builds is that they can't/don't stop threads in foreign code: safe points *poll* for interruptions.
2014-10-20T18:01:27Z pkhuong: so we have to disregard them when stopping the world (and if a foreign thread writes to boxed data during a GC, you get to keep all the pieces)
2014-10-20T18:02:37Z pkhuong: the machinery clearly works most of the time, but there might be races, e.g., when transitioning in/out of foreign mode while stopping the world
2014-10-20T18:03:31Z pkhuong: I'm also not sure how I feel about optimising wake-ups with multiple condvars in gc_state, but that's something else.
2014-10-20T18:05:49Z nyef: A while back, before safepoints landed, I had the idea of setting some kind of mutex to prevent threads in alien code from returning to Lisp during GC, and then only stopping the threads still in lisp. Never bothered working out the details, though.
2014-10-20T18:07:15Z hzp: There are still several tests which you can get to fail on safepoint builds if only you run the individual test often enough in a row.
2014-10-20T18:07:18Z hzp: That said, sudden robustness regressions aren't desirable or expected.
2014-10-20T18:16:58Z |3b|: hzp: true of non-safepoint builds too :/
2014-10-20T18:18:01Z |3b|: though at least some of those seem to be bad tests that don't handle variable system load well
2014-10-20T18:20:23Z pkhuong: anything timing based :|
2014-10-20T18:24:00Z |3b|: yeah, pretty much
2014-10-20T18:24:53Z nyef: Oh to be able to either precisely control the order of timing-critical events in testing or to use automated reasoning to prove that the implementation is correct.
2014-10-20T18:25:49Z |3b| was thinking 'timing' as in measuring time, but that kind is bad too :/
2014-10-20T18:26:12Z pkhuong: <- same as |3b|
2014-10-20T18:26:53Z nyef: Ah, yeah, okay. Wouldn't it be somewhat better to measure process (user+system) time rather than wall-clock time for those?
2014-10-20T18:27:03Z |3b|: more recent i saw was comparing runtime of a function in 2 different situations, and the cutoff was within the range of 1 situation from running it a hundred times or so
2014-10-20T18:27:55Z |3b|: yeah, might help with that one, though would probably have to go back to an old version with the bug to make sure
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