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Welcome to the main channel on the development of MoarVM, a virtual machine for NQP and Rakudo (moarvm.org). This channel is being logged for historical purposes. Set by lizmat on 24 May 2021. |
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| MasterDuke | timo: i noticed you had some comment about performance when using the iterator over strings. i don't remember what exact code i was looking at a little while ago (hopefully i have some work saved i can retrieve when my desktop gets set up soon), but there are a bunch of places where we could make a tradeoff of increased code size for better | 01:38 | |
| performance | |||
| coincidentally i was looking at dotat.at/@/2022-06-27-tolower-swar.html (a blog post about doing tolower() fast), but our current implementation of lc uses the grapheme iterator | 01:40 | ||
| and then github.com/simdutf/simdutf hit HN yesterday or today. istr i looked at it (or its precursor) before, but whatever i looked at wasn't immediately obviously useful. but it looks like it's been expanded upon since i looked at it before, so maybe someone else could take a second look and re-evaluate | 01:50 | ||
| fwiw, during a compete build+install of rakudo, lc() is called 86,531 times on strings of <8 chars and storage type of MVM_STRING_GRAPHEME_8 | 02:06 | ||
| hopefully in a week or so i'll be able to get back into moarvm/rakudo hacking a bit | 02:27 | ||
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| Nicholas | good *,* | 06:22 | |
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| timo | good | 08:18 | |
| i semi-randomly watched the "swiss tables" presentation again, the one from cppcon from the google engineer | 08:22 | ||
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| timo | our hash implementation doesn't use any intrinsics for sse and such? | 08:32 | |
| Guest68 | Hello everybody. I have been investigating a problem I have with rakudo on macOS: stackoverflow.com/questions/734149...u-2022-04. The problem is a commit to libuv. For Darwin fork()/exec() has been replaced with posix_spawn(). A side effect of this change is that posix_spawn() treats all descriptors, regardless if | 08:34 | |
| opened or not with O_CLOEXEC, as if they had. This is the pull request: github.com/libuv/libuv/pull/3064. I think that moar/raku/nqp (?) did not adapt to this change. The process is spawned but the output is lost. While I am certain that properly fixing this issue is beyond my capabilities I'd still like to have a look. I'd appreciate if | |||
| you could point me at a source folder/file/function worth investigating. | |||
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| Voldenet | Guest68: I could be wrong because the Proc::Async (I believe that is the one used here as well) is sufficiently complex, but github.com/MoarVM/MoarVM/blob/4b2d...ops.c#L764 is the line that spawns the process I think | 09:10 | |
| Guest68 | Voldenet: Thank you very much, I'll have a look. | 09:14 | |
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| Guest68 | Unfortunately I don't get anywhere. The program flow in spawn_setup() is always the same so the file descriptors are always setup the same way. It is interesting that the test only fails when it is wrapped in MAIN. | 11:25 | |
| This will succeed: echo hi | ./dir/install/bin/raku -e 'for slurp() { shell <<echo ok>>; }' | |||
| this won't: echo hi | ./dir/install/bin/raku -e 'sub MAIN() { for slurp() { shell <<echo ok>>; } }' | |||
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| Guest68 | I have filed an issue at github: github.com/MoarVM/MoarVM/issues/1720. Thanks for your assistance! | 15:45 | |
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| timo | isn't that how argfiles is supposed to work? | 17:42 | |
| ah i misunderstood | 17:55 | ||
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