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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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| samcv | MasterDuke: i have built it with flto and i didn't see many changes | 05:22 | |
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| samcv | also working on implementing Fibonacci hashing | 08:16 | |
| got around to fully looking at the article. and my favorite part is that it uses all the bits of the hash, so probably more secure | 08:17 | ||
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| MasterDuke | samcv: Fibonacci hashing with/for the current uthash? or something new? | 11:17 | |
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| brrt | \o | 11:58 | |
| I advertised MoarVMs string handling for a bit: lemire.me/blog/2018/06/15/emojis-j...ent-308918 | 11:59 | ||
| samcv++ | |||
| (for looking into improving our hashing) | 12:00 | ||
| re: concurrent lock-free hashmap, I can't seem to solve the problem of resizing, to my embarassement | 12:01 | ||
| jnthn | brrt: I guess you've seen web.stanford.edu/class/ee380/Abstr...eeHash.pdf ? | 12:37 | |
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| brrt | i haven't | 13:46 | |
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| brrt | that's interesting | 13:49 | |
| jnthn | :) | 13:50 | |
| Yeah, I have a collection of lock-free modules for some of the simpler cases (stack, queue, trie), and pondered doing the hash table one, but it's a comparatively big undertaking :) | 13:51 | ||
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| brrt | i was thinking of doing a linked hash table, it's kind of simpler to do that with CAS | 13:52 | |
| the thing i can't figure out is how to do atomic resize | 13:54 | ||
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| robertle | jnthn: you have a lock-free updateable trie? does that lie around somewhere by any chance? | 14:07 | |
| timotimo | it's on the ecosystem | 14:08 | |
| eco: Trie | |||
| buggable | timotimo, Trie 'A Trie implementation': github.com/FCO/Trie 5 other matching results: modules.perl6.org/s/ | ||
| timotimo | eco: Trie::Concurrent | ||
| buggable | timotimo, Nothing found | ||
| timotimo | eco: Concurrent::Trie | ||
| buggable | timotimo, Concurrent::Trie 'A lock-free concurrent trie (Text Retrieval) data structure.': modules.perl6.org/dist/Concurrent::...cpan:JNTHN | ||
| robertle | k, will have a look! | ||
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| samcv | MasterDuke: uthash | 14:35 | |
| brrt | samcv: any explicit plans to replace it completely rather than fully? | 14:38 | |
| no need to, btw, we basically forked dynasm as well | |||
| *completely rather than partially :-) | |||
| samcv | not atm | ||
| timotimo | if linking moarvm takes such a long time with -flto, i wonder if gold can also do lto? | 14:42 | |
| it's supposed to be very fast | |||
| brrt | what's gold? | 14:47 | |
| in this context i mean | |||
| ilmari | another linker | 14:49 | |
| MasterDuke | from google i think | ||
| brrt | oh, i see | 14:50 | |
| timotimo | yeah, since go always links everything statically, they have loads more symbols to put into their binaries, or something like that | 14:52 | |
| iiuc gold does some multithreading at the very least | 14:53 | ||
| brrt | i think gold predates go, if i read my wikipedia correctly | 14:55 | |
| timotimo | oh, OK | ||
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| samcv | yes gold predates go | 15:00 | |
| ilmari | google are just really unimaginative when it comes to naming | 15:03 | |
| MasterDuke | hm. i added -fuse-ld=gold as well as -flto=4, but took the same amount of time | 15:06 | |
| however, i'm not even entirely sure i have gold installed... | 15:07 | ||
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| timotimo | heh. | 15:08 | |
| a good time to try out execsnoop perhaps? | |||
| MasterDuke | don't know what that is | 15:09 | |
| timotimo | it's a tool based on perf that tells you everything that gets exec'd by a process directly and indirectly | ||
| i haven't actually tried it yet, but that's my idea of what it is | |||
| it's another brendan gregg thing, like the flamegraphs thing and flamescope | 15:10 | ||
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| MasterDuke | cool | 15:10 | |
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| MasterDuke | well, changing /usr/bin/ld to be a symlink to /usr/bin/ld.gold didn't change the build time any | 15:18 | |
| huh. /usr/bin/ld and /usr/bin/ld.gold have different sizes, but the output of -v for both of them is the same: GNU ld (GNU Binutils) 2.30 | 15:19 | ||
| timotimo | i get GNU gold (version 2.29-13.fc27) 1.14 | 15:21 | |
| MasterDuke | that was in arch linux. in kubuntu 18.04 i get 'GNU ld (GNU Binutils for Ubuntu) 2.30' and 'GNU gold (GNU Binutils for Ubuntu 2.30) 1.15' | 15:23 | |
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| Geth | MoarVM: 9d53069b04 | (Timo Paulssen)++ | src/jit/graph.c steal pow_i impl from interp.c for the jit |
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| timotimo | wait, are we okay with new commits on master right now? | ||
| brrt | ehm, i'm not against it, but i'm guessin we want extra-carefulness for rakudo star | 17:38 | |
| timotimo | btw, surely there's a better implementation of pow_i out there than this? | ||
| brrt | probably :-) | 17:41 | |
| timotimo | and surely we know one of the two values often enough to generate better code at the jit stage :) | ||
| brrt | also probably :-) | 17:44 | |
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| MasterDuke | star is next month isn't it? | 18:18 | |
| timotimo: why the name pow_i_impl? there aren't any other *_impl functions | 18:20 | ||
| timotimo | i didn't want to find a good place to put it %) | ||
| MasterDuke | heh | 18:21 | |
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| brrt | fwiw, 'where do i put this internal function' is one of the least of my worries :-) | 19:24 | |
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