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The simulator didn't behave like the real firmware: it only polled/spun the async tasks when there was USB input available, which happens at the client poll interval during a long-running workflow. Instead, usb_packet_process should be called if there is USB input, but the async tasks should be polled independently at max speed. We noticed this issue when making bip39-unlock async, and it would only advance by one bip39 stretch iteration every few hundred milliseconds.
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Does this make the simulator use 100% of one cpu thread? Maybe a quickfix could be to sleep 10 ms in the main loop? (the real fix is to change to an event loop that blocks if there is nothing more to do) |
Reduce CPU load
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Yeah I have a version where it does a timeout like this (pushed the commit here), but there is no good balance.
That is not an easy thing to do at the moment right? For now I am abandoning this PR and simply making bip39 unlock not yield in every iteration in the simulator. |
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The simulator didn't behave like the real firmware: it only polled/spun the async tasks when there was USB input available, which happens at the client poll interval during a long-running workflow.
Instead, usb_packet_process should be called if there is USB input, but the async tasks should be polled independently at max speed.
We noticed this issue when making bip39-unlock async, and it would only advance by one bip39 stretch iteration every few hundred milliseconds.