Table generation issue
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- Subject: Table generation issue
- From: Steve Heller <steve@...>
- Date: 2006年11月20日 16:32:50 -0800 (PST)
I've noticed a tremendous performance cost for
executing code that looks like the function reproduced
below. All the complicated code has already been
executed by the time I get here, and yet 90% of the
program's time is spent in this function. I'm assuming
it is because of the tables that are being created,
possibly a couple of thousands of them. Almost all of
the elements use consecutive integer indices. Is there
some way I can preallocate the tables that it is
generating, or reuse them from one invocation to
another?
Sorry for the ugly formatting. I hope it is still
readable.
Thanks.
-----------------------------
function
createFieldDataEntriesForOneDataGenerator(dataGenerator)
local data = dataGenerator()
local subTable = {}
local subTableBlock = {}
local subTableType
for i, element in ipairs(data) do
if data[i][1] == "<type>" then
subTableType = data[i][2]
elseif data[i][1] == "</type>" then
elseif data[i][1] == "<block>" then
subTableBlock =
{Number=data[i][2],Dup=data[i][3]}
elseif data[i][1] == "</block>" then
subTable[#subTable+1] = subTableBlock
else
if trim(data[i][2]) ~= "" then
subTableBlock[#subTableBlock+1] =
{data[i][1],data[i][2]}
end
end
end
return subTable, subTableType
end