【高级技巧】沙巴克战报广播：字符串拼接的GC压力治理

local buf, bufN = {}, 0
local lastFlush = os.time()
local function reportPush(line)
    bufN = bufN + 1
    buf[bufN] = line
    if bufN >= 20 then
        reportFlush()
    end
end
local function reportFlush()
    if bufN == 0 then return end
    local pack = table.concat(buf, "|")
    sendmsg(nil, 1, "【沙巴克战报】" .. pack)
    bufN = 0
    lastFlush = os.time()
end
local function reportTick()
    if os.time() - lastFlush >= 1 then
        reportFlush()
    end
end

local function bench()
    local t0 = os.clock()
    local s = ""
    for i = 1, 20000 do
        s = s .. "x"
    end
    local t1 = os.clock()
    local b, n2 = {}, 0
    for i = 1, 20000 do
        n2 = n2 + 1
        b[n2] = "x"
    end
    local packed = table.concat(b, "")
    local t2 = os.clock()
    return (t1 - t0), (t2 - t1), #packed
end