Re: optimising table creation; garbage collection

[Damian Stewart <damian@...>]

Jim Whitehead II wrote:

> Again, the bigger question asked by David is whether or not the overhead 
> of the table management (i.e. manually allocating and releasing) is 
> somehow more acceptable than the garbage you're creating.

well, i'm running a particle system in pure lua; one stage of it involved 
summing and multiplying two 3D vectors four times per particle per frame. 
it has a nice operator overloading inspired interface (Vector3:Plus, 
Vector3:Times etc), but unfortunately each time you call Vector3:Plus it 
creates a new Vector3 to store the result.

replacing these calls with manually splitting up the vectors into a bunch 
of local variables (eg local px, local py, local pz) gave me a /3x 
increase/ in frame rate. i went from being able to have 100 particles on 
screen @60fps to 300 particles @60fps.

so yes :-)

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