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hook function optimization

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hook function optimization

3 replies

hook function optimization

Quattro
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26.08.19 10:54:43 am

Just for the sake of curiosity, what's the most efficient way of handling a hook function? I heard return 1 can produce lags if used often and sometimes converting global variable to local can be faster. Which damage version below is faster and how to improve it?

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function hit(victim_id, attacker_id, weapon, hpdmg)
	if player(attacker_id, 'team') ~= player(victim_id, 'team') then
		match_damage_temp[attacker_id] = match_damage_temp[attacker_id] + hpdmg
	return
end

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function hitControl(victim_id, attacker_id, weapon, hpdmg)
	if player(attacker_id, 'team') == player(victim_id, 'team') then
		return 1
	end
	match_damage_temp[attacker_id] = match_damage_temp[attacker_id] + hpdmg	
end

Re: hook function optimization

Hajt
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26.08.19 07:21:21 pm

Both pieces of code will run with the same performance I would say, just code in second version looks better imo.

I used to code like this btw

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addhook("hit","damage.hit")
function damage.hit(id,source,weapon,hpdmg)
	if source == 0 then
		return
	end

	if player(source,"team") == player(id,"team") then
		return
	end

	dmg[source] = dmg[source] + hpdmg
end

Re: hook function optimization

Gaios
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28.08.19 02:45:54 pm

https://www.geeksforgeeks.org/writing-clean-else-statements/

Bad

Good

Quattro has written

I heard return 1 can produce lags if used often

Using

return 1

will prevent server to calculate dmg and player's hp and doesn't need to synchronize with all clients. For me it should be even faster.

Re: hook function optimization

DC
Admin

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31.08.19 11:19:11 am

Quattro has written

I heard return 1 can produce lags if used often

Wrong. Actually the opposite is the case (see below).

Gaios has written

Quattro has written

I heard return 1 can produce lags if used often

Using

return 1

will prevent server to calculate dmg and player's hp and doesn't need to synchronize with all clients. For me it should be even faster.

Correct. If hooks allow you to skip the standard CS2D action with return 1 then you should definitely return 1 if you want to skip that action. Skipping something is faster than not skipping something

For most hooks using return 1 will not only save a tiny bit of CPU (performance impact is absolutely negligible) but also - which is more important - the network sync traffic.

Quattro has written

and sometimes converting global variable to local can be faster.

Not sure what you mean in this particular case. I can't see anything related to that in your sample.
It's true though that local variables are faster than global variables in general. This is a micro optimization though which is not relevant for CS2D Lua scripting unless you have insane loops which iterate very often. It's still good programming style to save globals in local variables when they are accessed often in the same code block. This can also improve readability if the global var has a long name.

edited 1×, last 31.08.19 11:29:59 am