lua内存测试

测试lua在连续的地址空间遍历查找效率和hash查找效率，以及测试相同“长度”的hash表和数组所占空间对比。

local arr1 = {}
local map1 = {}

for i = 1, 1000 do
    local num = math.random()
    arr1[#arr1] = num;
	map1[num] = 1;
end

local time = os.clock();

collectgarbage();
local total = collectgarbage("count") * 1024

for i = 1, 100 do
	local num = math.random();
	for k = 1, 1000 do
		if num == arr1[i] then
			break;
		end
	end
end

print(os.clock() - time);
---0.003
arr1 = nil;
collectgarbage();
print("arr1::::" .. (total - collectgarbage("count") * 1024))
---arr1::::64

time = os.clock();

for i = 1, 100 do
	local num = math.random();
	if map1[num] then
	
	end
end

print(os.clock() - time);
---0
map1 = nil;
collectgarbage();
print("map1::::" .. (total - collectgarbage("count") * 1024))
---map1::::32864

测试lua不同基础数据所占空间

--先测试不同位数的数字所占空间
local byte = collectgarbage("count") * 1024;
print(byte)
--24248

local int16 = 2 ^ 15;
byte = collectgarbage("count") * 1024
print("int16 ==" .. byte)
--int16 ==24270, -----22

int16 = nil;
collectgarbage();
byte = collectgarbage("count") * 1024
print("" .. byte)
--21624

local int32 = 2 ^ 31;
byte = collectgarbage("count") * 1024
print("int32 == " .. byte)
--int32 == 21646 -----22

int32 = nil;
collectgarbage();
byte = collectgarbage("count") * 1024
print("" .. byte)
--21624

local int64 = 2 ^ 63;
byte = collectgarbage("count") * 1024
print("int64 == " .. byte)
--int64 == 21646 -----22

int64 = nil;
collectgarbage();
byte = collectgarbage("count") * 1024
print("" .. byte)
--21624


-- string "1"所占内存 和string “10000”所占内存
local string1 = "1"
byte = collectgarbage("count") * 1024
print("string1 == " .. byte)
--string1 == 21646 -----22

string1 = nil;
collectgarbage();
byte = collectgarbage("count") * 1024
print("" .. byte)
--21624

local string10000 = "10000"
byte = collectgarbage("count") * 1024
print("string10000 == " .. byte)
--string10000 == 21646 ----22

string10000 = nil;
collectgarbage();
byte = collectgarbage("count") * 1024
print("" .. byte)
--21624

local arr1 = {}
local map1 = {}

for i = 1, 100 * 100 do
	arr1[i] = 1;
	map1[tostring(i)] = 1;
end

byte = collectgarbage("count") * 1024
print("total == " .. byte)
--total == 1082302 -----1060678

arr1 = nil;
collectgarbage();
byte = collectgarbage("count") * 1024
print("arr1 == " .. byte)
--arr1 == 820126	-----240552

map1 = nil;
collectgarbage();
byte = collectgarbage("count") * 1024
print("map1 == " .. byte)
--map1 == 54184		-----765942