Memory usage. about esp8266scheduler HOT 8 CLOSED

Is there any reason you think this?

I would not imagine it would, the size of a class instantiation is the same, regardless of it is declared static or not.

from esp8266scheduler.

Just adding a task seems to take 4k ram space.

class MemPrinter: public Task {
public:
virtual ~MemPrinter() {
}
virtual void loop() {
Serial.println(ESP.getFreeHeap());
delay(2000);
}
};
MemPrinter mem_printer;
MemPrinter mem_printer2;
MemPrinter mem_printer3;
//MemPrinter mem_printer4;
void setup(void) {
Serial.begin(115200);
delay(100);
//Scheduler.start(&mem_printer);
Serial.println("Ready");
Serial.print(F("MEM END: "));
Serial.println(ESP.getFreeHeap());
//Scheduler.begin();
}
void loop(void) {
Serial.println(ESP.getFreeHeap());
delay(2000);
}

from esp8266scheduler.

Wow, 4k seems heavy for a class. I don't have my rig setup at the moment, I will have to look into this sometime this week.

Thanks for reporting.

from esp8266scheduler.

Probably part of the problem came from Task.context that is a cont_t that have a
stack[CONT_STACKSIZE / 4];
and
#ifndef CONT_STACKSIZE
#define CONT_STACKSIZE 4096
#endif
I'm going to investigate further...

from esp8266scheduler.

Thanks for looking into it.

If this is the case, there is unfortunately nothing to do about it. The cont_t is a critical part in being able to save and restore task context.

from esp8266scheduler.

I assume this is resolved. Please reopen if this is still an issue.

from esp8266scheduler.

This maybe explains why I get a OOM error in the console (activated debug for SSL+HTMLClient) when making "heavy" use of the library.

• Without using the library (obviously no multitasking) have 36440 bytes free in the heap before connecting to the host
• With 5 tasks running, I measure 11008 (25k less) and the connection cannot be made.

My 5 tasks plus the main task exactly matches the bill (6*4k=24k). Does this sound correct to you?
I guess I'll have to try to reduce it to 2 tasks, which is a pity, the code was looking so elegant.

from esp8266scheduler.

Yes, that seem about right.

from esp8266scheduler.