local memoryTable = {}

local function updateMemoryTable()
    local numAddons = GetNumAddOns()
    for i = 1, numAddons do
        memoryTable[i] = {i, select(2, GetAddOnInfo(i)), 0}
    end
end

local function sortMemory(a, b)
    if a and b then
        return a[3] > b[3]
    end
end

local function updateMemory()
    UpdateAddOnMemoryUsage()

    local total = 0
    for i = 1, #memoryTable do
        local value = memoryTable[i]
        value[3] = GetAddOnMemoryUsage(value[1])
        total = total + value[3]
    end
    table.sort(memoryTable, sortMemory)

    return total
end

updateMemoryTable();
print(updateMemory());