[Closed] Improve speed of "Create box()"

Messed around a bit trying to make the C# version multi-threaded, but non of the methods I tried looks to really be using multiple CPU cores.

V01: I[/I]

[View Code]( http://www.patan77.com/fastest_attach/genBoxesCParallel_01.txt)  

V02: I[/I]

[View Code]( http://www.patan77.com/fastest_attach/genBoxesCTasks_01.txt)  

V:03 : I[/I]

[View Code]( http://www.patan77.com/fastest_attach/genBoxesCThread_01.txt)  

temp solution for adding UV to the C# version cube:

(n 15 time: 0.109sec) n 50 time: 2.128sec, n 100 Time: 16.59sec Mem: 6007184L)

fn fn_uvSingleMesh inMesh = (
	gc()
	st=timestamp(); sh=heapfree
	with redraw off (
		with undo off (
			local m = uvwmap()
			addmodifier inMesh m
			converttomesh inMesh
			local rng
			local tVert = [0,0]
			for i = 1 to (getNumTVerts inMesh) by 8 do (
				rng = (random 0.0 1.0)
				for j = 1 to 8 do ( 
					tVert.x += 1
					setTVert inMesh tVert.x [rng,rng,0]
				)
			)
		)
	)
	update inMesh
	format "time:% heap:%
" (timestamp()-st) (sh-heapfree)
)
fn_uvSingleMesh $  

C# version boxes with UVs:
(With help from aaandres)

3dsMax2015:
with UV: (n 15 time: 0.008sec Mem: 432L | n 50 time: 0.513sec Mem: 432L)

Edit:
3dsMax2014:
with UV: (n 15 time: 0.007sec Mem: 416L| n 50 time: 0.106sec Mem: 416L)

[View Code]( http://www.patan77.com/fastest_attach/genBoxesWithUV.txt)  

0.513sec for n=50? Don’t you mean n=100?

I get 0.138sec for n=50 and 1.071 for n=100 with your code.
And my machine is far worse than yours. I’m under 3dsMax 2014 and Windows10.
Let’s see what other users get.

I’ve just tried an old Xeon E5520 2.27GHz (year 2008), 3dsMax2014 – Windows7.
For n=50, I get 230msec with your code !!??

New fastest version! [ C# multi-threaded ]

3dsMax 2014
n15: Time: 0.005sec Mem: 416L
n50: Time: 0.027sec Mem: 416L
n100: Time: 0.181sec Mem: 416L

I[/I]

[View Code]( http://www.patan77.com/fastest_attach/genBoxesMultiThreaded.txt)  

This version has a problem with random numbers. Look at the Top view to see the problem.
One solution is to create a ‘ThreadLocal<Random>’ static variable. It won’t affect performance at all.

The slowdown in Max 2015 and above seems to be related to IList access, as far as I could test. But I can’t figure out where the problem lies.

The performance drop isn’t small.

Does anyone have a clue on what can cause it?