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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 | good * #moarvm | 07:56 | |
| nwc10 | good *, brrt | 07:59 | |
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| brrt | ohai nwc10 | 08:00 | |
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| lizmat | and another Perl 6 Weekly hits the Net: p6weekly.wordpress.com/2018/06/18/...lake-city/ | 19:57 | |
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| timotimo | heh, commemnts | 20:13 | |
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| Zoffix | New blog post: "Perl 6 Colonpairoscopy": rakudo.party/post/Perl-6-Colonpairoscopy | 20:39 | |
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| timotimo | i liked that post, zoffix++ | 21:49 | |
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| jnthn | The title's a bit of a pain in the butt, though :P | 22:25 | |
| timotimo | it's a pun in the butt | 22:26 | |
| lizmat | depends how you look at it | ||
| jnthn | I'm not sure I want to look there :P | 22:28 | |
| timotimo | leave that to your progtologist | ||
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| MasterDuke | has anyone tried building MoarVM with LTO? | 23:14 | |
| jnthn | Link Time Opt? Ain't that on by default these days? | 23:15 | |
| MasterDuke | oh, you don't need -flto anymore? | ||
| jnthn | I'm sure all my MSVC builds were doing that, anyway...I kinda assumed it was happening on gcc/clang too | ||
| Would be worth checking, but the linking step seems to take long enough that I hope it's doing something useful there :-) | 23:16 | ||
| MasterDuke | hm: "Link-time optimization does not work well with generation of debugging information. Combining -flto with -g is currently experimental and expected to produce unexpected results." | 23:17 | |
| that's from the 7.3 man page | |||
| 8.1 isn't so scary: "Link-time optimization does not work well with generation of debugging information on systems other than those using a combination of ELF and DWARF." | 23:18 | ||
| oh! adding '-flto' to the CFLAGS makes the build take much longer (all during the "linking libmoar.so" stage). from 30s to 70s | 23:24 | ||
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| geekosaur | well, yes | 23:29 | |
| MasterDuke | hm. one random benchmark was slower using a moar built with -flto | 23:33 | |
| only very slightly. stage parse of building rakudo seemed exactly the same | 23:43 | ||
| geekosaur | I wouldn't actually expect LTO to gain that much for something like moarvm | 23:44 | |
| which is not that there's nothing to gain, but for something like moarvm you're going to need to do better than automatics. | 23:48 | ||
| MasterDuke | you mean profile-guilded instead? | 23:50 | |
| *guided | |||
| geekosaur | I mean very careful design, and profiling is only part of it. It's an interpreter; you need to put thought into what and how it interprets | 23:51 | |
| and it will be much more sensitive to memory layout than most code | 23:52 | ||
| but a decent amount of *that* might actually have to be at nqp level or higher to be effective | |||
| ...or where the effort is actually being put: JIT | 23:53 | ||