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| BenGoldberg | Has this happened for anybody before me: /usr/bin/moar: error while loading shared libraries: libmoar.so: cannot enable executable stack as shared object requires: Invalid argument | 01:18 | |
| This is with ubuntu on windows (aka WSL), right after I typed 'sudo apt-get install rakudo-star' then 'perl6' | 01:20 | ||
| MasterDuke_ | hm, i think there's something you need to do to build moar on windows in WSL, maybe need to do the same? | 01:24 | |
| BenGoldberg | I'm not building it from sources. | 01:25 | |
| I mean, if I really really had to, I could, but ... | 01:26 | ||
| geekosaur | you can try: execstack -c libmoar.so | 01:33 | |
| and then see if anything breaks | |||
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| BenGoldberg thanks geekosaur++ | 02:42 | ||
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| brrt | \o #moarvm | 05:49 | |
| samcv | \o brrt | 05:50 | |
| brrt | \o samcv | ||
| samcv | Unrecognized backslash sequence: '\o' | 05:51 | |
| brrt | hehe | ||
| how are things? | 05:52 | ||
| in a grumbling-old-guy kind of way, i don't get how | 05:54 | ||
| 'cracking the coding interview' has become some sort of rite-of-passsage for the young'un | 05:55 | ||
| hmmm | 06:17 | ||
| i've added some debugging logs and somehow dynasm broke | 06:18 | ||
| that aint' right | |||
| samcv | that sounds like the title of some book or something | 06:19 | |
| well probably is. idk lol | |||
| but you put it in quotes. or whatever | |||
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| brrt | 'cracking the coding interview' is all the rage | 06:48 | |
| it's a piss-poor analogy for a algorithms textbook, specifically optimized for the things that technical reviewers also optimize for, i.e. brevity and conceptual depth | 06:49 | ||
| *an | |||
| anyway, 'twas an off-by-one | |||
| Geth | MoarVM/even-moar-jit: 2824cd77b9 | (Bart Wiegmans)++ | 6 files Log tile list basic blocks Add a logging method for tile list and some debug info; it appears that stuff is not entirely right just yet, so good to have. |
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| brrt | i think the bug is in the 'closing' of the basic blocks... | 08:20 | |
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| timotimo | as long as it's closing and not cloning | 09:29 | |
| dogbert17_ | \o | 09:35 | |
| timotimo: what do you think about this? gist.github.com/dogbert17/4972c063...715dba7c6d | 09:36 | ||
| timotimo | did the diff get cut off in the middle? | 09:37 | |
| other than that i think it's fine | |||
| dogbert17_ | it might have been cut of but all the changes are there | 09:38 | |
| s/of/off/ | |||
| timotimo | yeah, i say commit it | 09:39 | |
| dogbert17_ | not sure I have such powers :) | ||
| guess I'll have to do two PR's instead | |||
| timotimo | that's fine | 09:40 | |
| is nqp also going to have the "usage on stderr if unknown flags passed"? | |||
| dogbert17_ | haven't tried but can do so when I get home from work. You mean running nqp with 'bad' options? | 09:41 | |
| the fix worked when running perl6 though so there's hope at least | 09:42 | ||
| timotimo | yup | ||
| just have to honor the :$use-stderr in nqp's compiler, too | |||
| dogbert17_ | will fix | 09:43 | |
| dogbert17_ notices that Zoffix 'vacation' seems to have been cut short | 09:45 | ||
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| Geth | MoarVM/even-moar-jit: a52cbffa7f | (Bart Wiegmans)++ | src/jit/tile.c Fix off-by-one in block-generation Range of basic block is [start, stop) so that we can for (i = start; i < stop; i++) 'standard' C looping rather than 'i <= stop', which is really just as easy but more confusing. Anyway, +1-ing start was wrong. Add some debug names in WHEN, could do the same in other construct but not necessary yet. |
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| brrt | there aren't many complex examples yet, but everything seems to be in ordr | 10:50 | |
| timotimo | neato | ||
| brrt | yeah | 10:51 | |
| i especially like how a single basic block can have only two successors, so we can have a static number of successors, so we can encode the graph structure entirely (and in this case, sufficiently) with just those two numbers per bb | 10:52 | ||
| matter of fact, i think i can do a little better | |||
| as you may have noticed, i'm obsessively against allocating dynamic structures if it's not strictly necessary | |||
| timotimo | right | 10:53 | |
| you can make one packed successors-array | |||
| with a simple indexing strategy | |||
| brrt | :-) | ||
| not sure if you've seen it, but i'm using a linked list for value references in linear scan? and all linked list nodes are allocated from a single buffer | 10:55 | ||
| and that was a major compromise from my perspective | |||
| timotimo | i haven't looked deeply at your code, tbh | 11:00 | |
| brrt | i didn't expect that, tbh :-) | 11:11 | |
| timotimo | OK, tbh | 11:13 | |
| brrt | :-P{ | 11:22 | |
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| timotimo | how did your mustache move to the tip of your tongue? :) | 11:39 | |
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| brrt | hehe | 12:06 | |
| that reminds me | |||
| i need to shave | |||
| also | |||
| jnthn++ for a very nice blog post | |||
| i have a few due myself | |||
| jnthn wonders if brrt read the "proof" at the bottom :) | |||
| brrt | obviously i did | ||
| jnthn | Figured you'd be one of the folks who did :-) | 12:07 | |
| I also thought it would be a heck of a detour in the middle of the post, thus why it got footnoted :-) | |||
| brrt | :-) obviously a single broken implementation is not exhaustive proof, hence the quotes | ||
| jnthn | Well, if you're trying to prove "it never ends up with in-use memory on the free list" then proof by contradiction is sufficient :-) | 12:10 | |
| The proof of correctness for FREE is far more handwavey | 12:11 | ||
| brrt | hmm…. let me think about it for a bit | ||
| …. yes, i think you are right | |||
| anyway, it's an interesting assymetry | |||
| asymmetry | 12:12 | ||
| jnthn | That you can lock-free push but not lock-free pop? Yes. | 12:13 | |
| If you're in a GC'd language then you have a lot of get-outs from ABA though | 12:14 | ||
| Because you know a memory address can never be re-used until all references are gone, including the one held by the sleeping thread. | |||
| brrt | well, that's true for the case of allocation, not for lists in general :-) | 12:15 | |
| jnthn | Well, it's something you can take advantage of generally as a problem-solving technique, but you may need an extra LOI :) | 12:20 | |
| timotimo | jnthn: did you notice that valgrind + --full-cleanup is a bit mad at the new freelist stuff? | 12:21 | |
| timotimo AFK for a bit | |||
| jnthn | timotimo: No, hmm | 12:22 | |
| :) | |||
| File a MoarVM issue on that, if you think there's new bustage | |||
| Geth | moarvm.org: 407a767fb9 | jnthn++ | 2 files Update MoarVM site for 2017.04 release. |
12:36 | |
| jnthn | I'll be away from now until noon on Wed :) | 12:39 | |
| nwc10 | have fun | ||
| (I hope) | |||
| jnthn | Me too :-) | 12:42 | |
| o/ | |||
| brrt | see you, have fun | 12:52 | |
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| MasterDuke_ | i've heard good things about intel's vtune amplifier, and it looks like Open Source developers may be able to get a license for free software.intel.com/en-us/intel-vtu...xe/try-buy | 14:05 | |
| anybody here think it would be useful for analyzing/optimizing moarvm? | 14:06 | ||
| dogbert17_ | MasterDuke_: why not :) | 14:28 | |
| timotimo | it can do python and such, maybe theres simple hooks we couldnuse to get line annotations into the profiler, too | 14:30 | |
| MasterDuke_ | i wouldn't consider myself knowledgeable enough about moarvm or proficient enough in C to deserve a free license (and i don't actually know how hard they are to get), but i'd thought i'd mention the possibility in case people didn't know | 14:34 | |
| but who knows, maybe they hand them out like candy? | 14:35 | ||
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| Geth | MoarVM/even-moar-jit: daaadd34b4 | (Bart Wiegmans)++ | src/jit/tile.c More pseudotile debug names For better understanding the generated code |
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| MoarVM/even-moar-jit: dc07cb85e4 | (Bart Wiegmans)++ | src/jit/tile.c Fix basic block ranges during tile list insertion When we insert tiles into the tile lists, the range of each of the associated basic blocks changes. Because of the linear order of basic blocks, simple in-place updating is sufficient to compensate. Note that this assumes the basic block structure itself is left unchanged. |
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| timotimo | i wonder if we should have somezhing that inserts nops to help see the structure of nodes reflected in the assembly output | 18:08 | |
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| samcv | good morning | 19:57 | |
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| Geth | MoarVM/configure-telemeh-probe-rdtscp: 8bf37cc768 | (Timo Paulssen)++ | 5 files enable --telemeh, --no-telemeh, and probe for rdtscp |
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| Geth | MoarVM/configure-telemeh-probe-rdtscp: 4aa1133107 | (Timo Paulssen)++ | Configure.pl document --no-telemeh and --telemeh |
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| MasterDuke_ | timotimo: did you see my comment on your first commit? | 20:56 | |
| Geth | MoarVM/configure-telemeh-probe-rdtscp: 5fd7978d5d | (Timo Paulssen)++ | src/main.c include or exclude telemetry log env var in usage/--help |
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| timotimo | i did not, let's see | 20:58 | |
| good catch, thanks | 20:59 | ||
| MasterDuke_ | np | 21:00 | |
| Geth | MoarVM/configure-telemeh-probe-rdtscp: 55e61aac83 | (Timo Paulssen)++ | Configure.pl fix copy-pasto, MasterDuke17++ |
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| timotimo | and that's why you don't commit to master at 11pm | ||
| lizmat | and another Perl 6 Weekly hits the Net: p6weekly.wordpress.com/2017/04/24/...ing-times/ | 21:47 | |
| japhb | lizmat: Thank you for posting that in the quiet channel too. :-) | 23:03 | |
| Zoffix++ # perl6.party/post/The-Failure-Point-of-a-Release <-- Very clear postmortem | 23:13 | ||
| samcv | lizmat, can you make telling people to tag their modules a bit more prominent? with a sentence or two? | 23:38 | |
| i often don't read the full list of blog posts every week | |||