Re: gc bug in 2.0.4?
- From: Mike Pall <mikelj-1611@xxxxxxx>
- To: luajit@xxxxxxxxxxxxx
- Date: Tue, 15 Nov 2016 15:58:33 +0100
Aleksandar Kordic wrote:
So the solution is:
local ffi = require"ffi"
local cType = ffi.typeof("float[?][2]")
math.randomseed(1)
for i = 1, 10 do
local t = {}
local counter = math.random(1000)
for l = 1, counter do
t[l] = {l, 0}
end
local z = cType(counter, t)
collectgarbage()
local sum = 0
for l = 0, counter - 1 do
sum = z[l][1] + z[l][0] + sum
end
end
Nope. Don't create an intermediate table. That's expensive and
unnecessary. Directly initialize cdata fields. Also, you can rely
on zero-initialization and avoid setting fields to zero again.
local z = cType(counter)
for l=0,counter-1 do z[l][0] = l end
Also, don't allocate a new array every time, unless you want to
benchmark allocation overhead.
--Mike
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