how to know if all the thread is initialized? about piscina HOT 5 CLOSED

Worker threads in general have a ready event, yes. In Piscina, runTask() will not attempt to dispatch tasks to workers until after the worker signal they are ready.

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Hey! Kind of late to the party but I believe the use case is interesting.
You want to do a warm-up of the threads, so they are ready beforehand (e.g. warm it up before starting to receive requests, similar to warming up the cache).

I agree with @jasnell that a ready might not be useful, but we already have minThreads at hand that can be used as a baseline, and Piscina ensures those minimum workers are available before starting processing tasks.

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Worker threads in general have a ready event, yes. In Piscina, runTask() will not attempt to dispatch tasks to workers until after the worker signal they are ready.

I know that Piscina use worker's ready event inside,
but maybe we need a ready event from Piscina.

start server -> wait all threads ready (use minThreads) -> server listen()

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Sorry for the later response. I'm not sure a ready event for piscina is useful, to be honest. Tasks are queued until there's a worker available and there's really no reason an application should have to wait to use the worker pool. Can you expand a bit on the use case?

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When using on a server, the first few response will be too slow.
this happens especially when we have a big service, and the server restarts a lot per day (because of code iteration).
if we have a ready event, we can make some server restart first，wait ready，then restart others.

anyway, this maybe a extreme case.

I found a trick way to do this:

async function initThread() {
    let threadNum = 10;
    let tasks = [];
    while (threadNum--) {
        // just init, thread can use `isWarmup`
        tasks.push(piscina.runTask({ isWarmup: true }));
    }
    await Promise.all(tasks);
}

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