cpu load serial-monitor.exe

[Holger Lembke]

Moin!

I always stumble across the relatively high cpu load serial-monitor.exe creates.

Mine currently has about 6% on an idle system. That is the task with the most cpu load.. Even more than Firefox... Why? As far as I see, it only reads from stdio and writes back to stdout (?)

mfg

Holger

[c.ma...@bug.st]

Hello Holger,

serial-monitor.exe is a proxy between the serial port and the client that runs it (the Arduino IDE or the Arduino CLI). It is part of the ecosystem that we call Pluggable Monitors https://docs.arduino.cc/arduino-cli/pluggable-monitor-specification/

The client controls serial-monitor.exe via stdio, it sends ASCII commands to open/close the serial port and set options like baudrate, parity etc.
Once the serial port is opened, communication with it is done on a different channel via network TCP/IP (using the loopback interface).

The CPU load may depend on how much data is transferred via the serial port. In the early tests we did, it could handle several MB/sec, and the process may easily starve one CPU core.

If you think the load on your CPU is excessive you could open an issue on the serial-monitor github repo with the instructions to reproduce and we will take a look -> https://github.com/arduino/serial-monitor

Thanks!

C

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[Holger Lembke]

Moin!

This error seems to be caused by some mysterious effects I can't point out. Currently, it is gone. But it was there. Just attach any board with an empty sketch and load is at 8 %. 

Might have a background in my PC-use-case with lots of hibernates and reboots only every other month...

So it does not make any sense to open an issue. And I looked into the source code, too. I did not see any obvious problems... (All this comment free golang code, pffff.)

mfh

Holger

[Holger Lembke]

Moin!

Addendum:

* seems it is related to a certain board type: esp8266 (3.1.2 https://arduino.esp8266.com/stable/package_esp8266com_index.json)

if I select a different board type, the load is gone.

* something is pumping data...

as far as I can see, there is a thread continuously moving data.

[c.ma...@bug.st]

Thanks for investigating the problem Holger!

please open an issue at https://github.com/arduino/serial-monitor/issues we'll continue the discussion there.

thanks

C.