Crash when initializing matrix of size 170x170 about arduinoeigen

[hideakitai]

Could you give me a minimal code to compile and reproduce the problem?

[hideakitai]

Hi @albertbayazidi , sorry for the late reply. I have tried your code and successfully reproduced the problem. However, Eigen's limitation is in the size of rows/cols. Bad alloc exception was thrown from here:

ArduinoEigen/ArduinoEigen/Eigen/src/Core/PlainObjectBase.h

Line 48 in 8f073b5

throw_std_bad_alloc();

I couldn't find a way to work around it, so I recommend asking the Eigen community.

[albertbayazidi]

I was unable to reproduced the problem for the newest version of Eigen

[hideakitai]

How about increasing stack size of main task?

espressif/arduino-esp32#5173

[albertbayazidi]

I'll try this

[albertbayazidi]

Increasing the stack size of the main task led to crashes for smaller matrices. I also tried decreasing the stack size so there was more heap memory, but it began crashing because there was too little stack. My understanding is that there is enough heap memory for a 170x170 matrix but it crashes for some other reason.

[albertbayazidi]

int n = 169; //will crash for n = 170 on an esp32

Eigen::MatrixXf A(n,n);

void setup() {
// put your setup code here, to run once:
Serial.begin(115200);

}

void loop() {
size_t freeHeap = ESP.getFreeHeap();
Serial.printf("Free heap memory: %u bytes\n", freeHeap);
delay(1000);

}