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github.com/moarvm/moarvm | IRC logs at colabti.org/irclogger/irclogger_logs/moarvm Set by AlexDaniel on 12 June 2018. |
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| brrt | \o | 08:46 | |
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| nine | Oh boy....I think there's a race condition in spesh plugin guard resolution | 09:40 | |
| That's the only explanation I can find for the ps pointer in resolve_using_guards to become outdated (0x7f2428467550 vs. 0x7f2428467500 in tc->cur_frame->static_info->body.spesh->body->plugin_state) | 09:43 | ||
| I don't think I can fix this without invoking the jnthn++ | 09:44 | ||
| Of course, I could simply add a lock, but I also think that's precisely what jnthn wanted to avoid. And I know too little about possible alternatives. | 09:46 | ||
| moritz | .oO( now you have two problems. ) |
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| dogbert17 | nine: have you found any more bugs? | 10:43 | |
| nine | dogbert17: make test is still working through the 02-rakudo tests. Got 3 core dumps so far. One is the *item_ptr != item->sc_forward_u.forwarder assertion for which I suspect that it's not really an issue in multi threaded programs. One's the race condition in spesh plugin guard resolution I mentioned. | 10:49 | |
| dogbert17 | very cool, there seems to be quite a few gremlins hiding in the codebase | 10:55 | |
| nine | Yeah. Unfortunately runtimes measured in hours make it impractical to test stuff. So all I can do is look at data in gdb and read code | 10:57 | |
| timotimo: I'm pretty sure you need to MVMROOT log_obj there: github.com/MoarVM/MoarVM/blob/mast...rker.c#L46 | 11:15 | ||
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| timotimo | oh, good call | 11:45 | |
| MasterDuke | huh. a profile of `my $a; $a = $_.starts-with("1").Int for ^1_000_000; say now - INIT now; say $a;` shows that `starts-with` isn't being jitted at all. but it doesn't have any 'bailed completely' in a spesh log | 11:50 | |
| timotimo | explicitly casting $_.Str.starts-with makes it a whole lot faster | 12:11 | |
| find_best_dispatchee is doing a whole lot of work | |||
| also, add_to_cache is called a million times | 12:12 | ||
| so what exactly goes into the multi cache there ... | 12:13 | ||
| the callsite that's being used isn't interned, which makes it not add the result to the cache | 12:16 | ||
| it's just a two-flag callsite with the two flags being 1 | 12:18 | ||
| which is just "two objects" | 12:19 | ||
| MasterDuke | why wouldn't it be interned? | 12:36 | |
| this seems like a bug (in the sense that performance is not what it should be) | 12:37 | ||
| timotimo | i'll have to trrace the callsite back to where it's allocated and see why it isn't attempted to be interne | 12:56 | |
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| Geth | MoarVM/master: 5 commits pushed by (Bart Wiegmans)++ | 13:33 | |
| MoarVM/expr-jit-devirtualize: 5 commits pushed by (Bart Wiegmans)++ | 13:36 | ||
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| dogbert17 | \o | 16:22 | |
| it seems as if one of the latest commits have introduced a bug which shows up when running with a small nursery | 16:23 | ||
| Thread 1 "moar" received signal SIGSEGV, Segmentation fault. | 16:24 | ||
| 0x00007ffff74e3b72 in MVM_multi_cache_find_callsite_args (tc=0x604ac0, cache_obj=0x2aa5b40, cs=0x7ffff7c874e0 <two_args_callsite>, args=0x3c04b10) at src/6model/reprs/MVMMultiCache.c:417 | |||
| it could in fact be one of brrt's recent commits | 16:26 | ||
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