Monitoring tornado's IOLoop.

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SECOB271_Ganesh Pawar

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Feb 4, 2021, 9:06:20 AM2/4/21
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Is it possible to monitor how busy a tornado IOLoop has been? Like if the IOLoop has been blocked for some time, it should report.

Earlier I did this using set_blocking_log_threshold in tornado version 4. But now tornado has removed this functionality.

So, is there an effective way to monitor the IOLoop busyness-level in the latest tornado version? Perhaps by turning on some debugging settings?

Without using asyncio?


SECOB271_Ganesh Pawar

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Feb 4, 2021, 9:10:41 AM2/4/21
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I see that nowadays, tornado just uses ayncio's event loop. Asyncio's BaseEventLoop has an attribute slow_callback_duration which reports if the execution of a callback or a step of a task exceed this duration in seconds. Is there any way to do this in tornado natively?

SECOB271_Ganesh Pawar

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Feb 5, 2021, 8:17:09 AM2/5/21
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Can someone please help me with this? I need this for an external project I'm working on. It has been stuck on tornado version 4 for the past year. I really want to upgrade it to the latest version. And I can't use asyncio directly, so I need to do this in tornado. Please help.

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Adrian

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Feb 6, 2021, 6:27:12 AM2/6/21
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I think all you need to do is to set an environment variable before you run your interpreter:

export PYTHONASYNCIODEBUG="1"

For more detail, run python with --log=DEBUG


Ben Darnell

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Feb 6, 2021, 8:55:37 PM2/6/21
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Correct. There is no longer any way to control this via Tornado; you must enable the event loop's debug mode using one of the methods described in https://docs.python.org/3/library/asyncio-dev.html#debug-mode

Why can't you use asyncio directly? (What do you mean by "using it directly"?)

-Ben

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