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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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| Kaiepi | i tried using uv_timer_t to sleep(0) instead of yielding, but apparently that api forks? | 16:46 | |
| i did manage to get sleep(0e0)/nanosleep(0) to work given recent changes, but it's rather slow | |||
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| jnthn | Kaiepi: What's the original goal here? Semaphore (along with similar classes) were really intended to expose the primitive kernel-supported locks/sempahores; if you want something a bit different and are willing to depend on yield and atomics, there's no reason to put it in MoarVM, because those are all available in Raku. | 17:41 | |
| tellable6 | 2022-07-22T07:39:31Z #moarvm <Kaipii> jnthn, do you have any suggestions on how to benchmark semaphore ops reliably? | ||
| jnthn | No yield/sleep/whatever is going to be as effective for longer waits as something where the OS schedule is aware of it. | 17:42 | |
| *scheduler | |||
| Kaiepi | jnthn, to get an implementation of Semaphore with some equivalent to sem_getvalue | 17:54 | |
| so we can get a serializable, thread-safe counter for the MOP | 17:55 | ||
| (or at least a more efficient one) | 17:56 | ||
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| jnthn | Counter? Is an atomic integer not enough? | 19:17 | |
| Kaiepi | an atomic integer requires a container | 19:18 | |
| jnthn | Not quite, just a reference to an integer lexical/attribute/array elemnt | ||
| And if the concern is performance, one can create that reference once and use it many times | 19:19 | ||
| Ah, and if it's for the MOP, and nobody got around to it yet, there might be a little setup work to do to make those available in NQP | 19:20 | ||
| github.com/rakudo/rakudo/blob/a7e9....nqp#L1899 is a place to look at how the setup is done if wanting to do it for NQP | 19:22 | ||
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