Hi Maria,
When distributed arrays are constructed, they are distributed as evenly as possible along the second dimension. In your case, it means 4500 is spread into 8 parts and some workers end up getting 10000x562x8 local parts whereas others are getting 10000x563x8 local parts. So not all workers are using the exact same amount of memory, but I believe that do not explain the discrepancy you're seeing. I suspect the computation you're doing afterwards on H_sym involves communication between workers, thus workers receiving messages use more memory. And that could explain what you are seeing. What computation are doing on H_sym after creating it?
Finally, the way you're building H_sym is correct but there is more efficient here:
H_sym = zeros(m,m,LENGTH_BETA,'like',distributed(1i));
Cheers,
Oli
