src: implement --trace-promises #50899
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Please suggest a text for the release notes if you'd like to include a more detailed summary, then proceed to update the PR description with the text or a link to the notable change suggested text comment. Otherwise, the commit will be placed in the Other Notable Changes section. |
I think this should be a core developer debugging flag (we have several of those, like --verify-base-objects and --inspect-brk-node) so we should avoid documenting it. At least for now, lest some user depends on it. We can consider documenting it later when it's used a bit more internally. (I am not even sure if this is free of bugs, but as far as I've tested it works well enough). |
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I think the cost can be non-trivial, depending on how promise-heavy the use case is, although it’s just a debugging flag so it’s not supposed to be turned on in any case that care about performance. |
This patch implements a debugging flag that dumps the current stack trace when a promise is created or resolved. To reduce noise we ignore before and after events (as the execution is less interesting) and use the per-isolate hook to avoid extra JS frames. This flag can assist work in reducing unnecessary promise overhead.
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Removed it from the tests because we are intentionally not documenting it for now. |
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Pretty significant but being set in C++ helps |
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Landed in 1e31a01 |
This patch implements a debugging flag that dumps the current stack trace when a promise is created or resolved. To reduce noise we ignore before and after events (as the execution is less interesting) and use the per-isolate hook to avoid extra JS frames. This flag can assist work in reducing unnecessary promise overhead. PR-URL: #50899 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: Vinícius Lourenço Claro Cardoso <[email protected]> Reviewed-By: Chengzhong Wu <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]>
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FYI, I created a feature request for a "promise dump" of a currently running program. I thought I'd mention it here because it might be another useful dev tool like |
This patch implements a debugging flag that dumps the current stack trace when a promise is created or resolved. To reduce noise we ignore before and after events (as the execution is less interesting) and use the per-isolate hook to avoid extra JS frames. This flag can assist work in reducing unnecessary promise overhead. PR-URL: #50899 Reviewed-By: Yagiz Nizipli <[email protected]> Reviewed-By: Geoffrey Booth <[email protected]> Reviewed-By: Vinícius Lourenço Claro Cardoso <[email protected]> Reviewed-By: Chengzhong Wu <[email protected]> Reviewed-By: Benjamin Gruenbaum <[email protected]>
This patch implements a debugging flag that dumps the current stack trace when a promise is created or resolved. To reduce noise we ignore before and after events (as the execution is less interesting) and use the per-isolate hook to avoid extra JS frames. This flag can assist work in reducing unnecessary promise overhead.