Revision e4ec80ff19b51a4cdf6d41da0b15b559f8514c2b authored by Shuhei Kadowaki on 10 January 2024, 16:48:28 UTC, committed by Shuhei Kadowaki on 11 January 2024, 08:56:13 UTC
REPL utilizes inference for smarter completions, but since its inference engine is independent from the native cache and issues like #52763 in `REPLInterpreter`'s inference, sometimes delays can be noticeable during tab/hint-completion, and REPL can even freeze in the worst cases. To address this, the commit allows tab/hint-completion to run asynchronously on a `:default` thread. This approach removes delays in multi-threaded process and prevents REPL hang in extreme cases like #52763. In detail, for tab-completion, completion task simply runs on a separate thread since completion itself does not block anything. For hint-completion however, considering that a stuttering display of hints can be bothersome, when the completion task doesn't conclude within 0.01 sec, we cancel the hint-completion to keep the input in the REPL smooth. There are still some points left open for discussion: - Is it better to allocate a separate thread specifically for REPL completion? I'm not sure if this is even possible though. - Should we make this an optional feature, considering the concern some users might have about reduced thread resources? - For situations where completion hangs or is slow, like in #52763, canceling the completion task to release resources would be ideal. However, my understanding is that there's no safe method to cancel a task, is it correct? - At present, this commit `Threads.@spawn`s at a relatively high level in the completion pipeline. But it might be more effective to `Threads.@spawn` closer to the point where inference is actually invoked, such as in `complete_line` or `repl_eval_ex`.
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