initializing large array gives 'Address boundary error'

[gritty knot]

#include <fstream>
#include <stdio.h>
#include <iostream>
using namespace std;

int main() {

        ifstream file("train-images-idx3-ubyte", ios::in | ios::binary);
        unsigned char pixel;
        int pixels[47040000];
        int i = 0;
        while(file.read(reinterpret_cast<char*>(&pixel),1)) {
                printf("%d\n", pixel);
                i++;
        }
        printf("\n\n%d", i); 
        file.close();

}

the int pixels[47040000] line is giving me the error. making the size smaller works, but I need it to be this size.

[broken arrow]

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[gritty knot]

you can ignore all the other code.

I dont get why this is too large, as that is like 180 mb. and I have 8 gb of memory

'./a.out' terminated by signal SIGSEGV (Address boundary error)

[grim shadow]

Typically the stack has 1 to 8MB of memory, depending on OS and settings.

Make it static so it no longer resides on the stack or use an std::vector which uses the heap.

[wicked echo]

static will bloat your exec, so use vector

[rustic light]

it won't as long as it's zero-initialized

[tulip verge]

why?

is it not still the same size either way?

[rustic light]

because everything zero just becomes part of the .bss section

the executable doesn't literally store a bunch of zeros

[tulip verge]

right, but its still in the exe

[rustic light]

it just stores how large the bss section is in total

[tulip verge]

oh I see now, data in bss is not included in the exe

I was not aware of this before