Cheat Engine :: View topic - Comparing the execution time of two functions

Cheat Engine
The Official Site of Cheat Engine

FAQ

Memberlist

Usergroups

Profile

Comparing the execution time of two functions

Cheat Engine Forum Index -> Cheat Engine Lua Scripting

View previous topic :: View next topic

Author

Message

GH*master
Expert Cheater

Reputation: 8

Joined: 10 Jan 2008
Posts: 159

Posted: Sun Jun 18, 2017 2:26 am Post subject: Comparing the execution time of two functions

Code:

function NoOptimizeCode()
--[[Presumably not optimized code]]--
end

function OptimizeCode()
--[[Presumably optimized code]]--
end

local countRepeat = 100000 -- add more cycle
local x1 = 0
local x2 = 0

x1 = os.clock()
for i = 1, countRepeat do NoOptimizeCode() end
x2 = os.clock()
for i = 1, countRepeat do OptimizeCode() end

local deltaTimeOptimize = (os.clock() - x2)
local deltaTimeNoOptimize = (x2 - x1)

print(string.format("%.2f\n", deltaTimeNoOptimize/deltaTimeOptimize))

Examples:

Code:

function NoOptimizeCode()
if string.match('mov eax, [edx]', 'edx') then
end
end

function OptimizeCode()
if string.find('mov eax, [edx]', 'edx') then
end
end
--> 1.38

Code:

local tableA = {'A', 'B', 'C'}

function NoOptimizeCode()
local t = #tableA
for i = 1, t do

end
end

function OptimizeCode()
for i = 1, #tableA do

end
end
--> 1.04

Code:

tableA = {'A', 'B', 'C'}
local tableB = {'A', 'B', 'C'}

function NoOptimizeCode()
for i = 1, #tableA do

end
end

function OptimizeCode()
for i = 1, #tableB do

end
end
--> 1.14

Code:

function NoOptimizeCode()
tableA = {'A', 'B', 'C'}
end

function OptimizeCode()
local tableB = {'A', 'B', 'C'}
end
--> 1.08

Try to compatible for:
string.match (s, pattern [, init])
string.gmatch (s, pattern)
string.gsub (s, pattern, repl [, n])
string.find (s, pattern [, init [, plain]])

And other things that you wanted to know for comparison

atom0s
Moderator

Reputation: 198

Joined: 25 Jan 2006
Posts: 8517
Location: 127.0.0.1

Posted: Sun Jun 18, 2017 2:47 am Post subject:

If you have access to LuaSocket you can use its 'gettime' function for a more precise time than os.clock gives.

Code:

socket.gettime()

_________________

- Retired.

Dark Byte
Site Admin

Reputation: 458

Joined: 09 May 2003
Posts: 25287
Location: The netherlands

Posted: Wed Jun 21, 2017 12:26 pm Post subject:

getTickCount() can be used as well _________________ Do not ask me about online cheats. I don't know any and wont help finding them. Like my help? Join me on Patreon so i can keep helping

Display posts from previous:

	Cheat Engine Forum Index -> Cheat Engine Lua Scripting	All times are GMT - 6 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum