Python terminal slows down over time

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1

Hi everyone,

I’m using an odrive as part of a larger system that is being coordinated via a python program run from an ipython terminal. This system will often run for a few hours at a time, over which the terminal + all running code slows down (even typing letters/print statements take ~1-2 seconds to execute). I’ve found that if I destroy the odrive object, after about 30 seconds the terminal will go back to its original speed.

I don’t think this is a memory leak, as the total memory usage of my terminal doesn’t change over time. I have a ferrite bead at either end of the usb cable, and I am not going through a usb hub.

Thanks in advance for any suggestions!

-Rishi

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2

I think I found a fix, though it would be great if someone who knows better could explain why this works.

odrv0._libfibre.timer_map is a dictionary that adds a new <TimerHandle> entry once per second. As these entries accumulate, the terminal eventually slows down. I assume these are all involved in some background process within libfibre that accumulate into GIL. When i clear this dictionary by odrv0._libfibre.timer_map = {}, in a second or two (assuming this is the interval of the libfibre background process) the terminal speed goes back to normal. From what I can tell this does not affect operation of the odrive.

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Thanks for tracking down the issue. Can you try the following fix in libfibre.py? (if you installed odrive via pip the location of this file depends on your OS)

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image798×235 27.8 KB

copy&paste from here:

        def cb():
            self.timer_map.pop(timer_id)
            callback(ctx)
        timer_id = insert_with_new_id(self.timer_map, self.loop.call_later(delay, cb))

Think this bug only manifests on Windows so I didn’t have time to test the fix yet.

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I am having the same problem. I have stared at the code for hours and the copy and paste appears to be identical to the original. Am I missing something?