Re: [ANN] Lua 5.2.1 (work1) now available
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- Subject: Re: [ANN] Lua 5.2.1 (work1) now available
- From: David Manura <dm.lua@...>
- Date: 2012年3月24日 21:49:51 -0400
On Thu, Mar 22, 2012 at 2:43 PM, KHMan <keinhong@gmail.com> wrote:
> (a) load data, parse, dump into two arrays [...]
> lua-5.2.0 0.261 0.274 0.285
> lua-5.2.1wk1
> shortlen=16 0.180 0.188 0.204
> shortlen=32 0.224 0.201 0.220
No difference in word count (wc): http://www.lua.org/pil/21.2.1.html .
Under more optimal contrived conditions, I can get ~50% speedup though:
-- $ dd if=/dev/urandom of=/tmp/random bs=1048576 count=100
local N = tonumber((...) or 33)
local fh = assert(io.open('/tmp/random', 'rb'))
local res = 0
local t = {}
while 1 do
local data = fh:read(N)
if not data then break end
--data = data:gsub('%s', '') -- speed difference is smaller with this line
res = res + data:byte(1)
t[#t+1] = data -- speed difference is smaller without this line
end
-- table.sort(t) -- speed difference is smaller with this line
print(res)