Get the memory footprint of the current process. Taken from StackOverflow.

MemoryFootprint.swift

func memoryFootprint() -> mach_vm_size_t? {
    let integer_t_size = MemoryLayout<integer_t>.size
    let count = mach_msg_type_number_t(MemoryLayout<task_vm_info_data_t>.size / integer_t_size)
    let TASK_VM_INFO_REV1_COUNT = mach_msg_type_number_t(MemoryLayout.offset(of: \task_vm_info_data_t.min_address)! / integer_t_size)
    var info = task_vm_info_data_t()
    
    let kr = withUnsafeMutablePointer(to: &info) { infoPtr in
        infoPtr.withMemoryRebound(to: integer_t.self, capacity: Int(count)) { intPtr in
            return task_info(mach_task_self_, task_flavor_t(TASK_VM_INFO), intPtr, &count)
        }
    }
    
    guard kr == KERN_SUCCESS, count >= TASK_VM_INFO_REV1_COUNT else {
        return nil
    }
    
    return info.phys_footprint
}