On 20/02/2011 17:13, Colin Holgate wrote:
I just did some timing tests, partly to see if using an array might help with
speed. It didn't, but in doing the test I thought of a neater way of testing
than I've done before.
Usually my testing would resemble this:
...
Then I would type in "oneway" or "otherway" in the message box. It works well
enough, but if I decide to change how many repeats to do I have to go in and change each place.
There's also a lot of same lines, where I'm making note of the time.
What I did just now is below, and to test the various technique I just type "timeit
technique,repeatcount" in the message box. So for example, to test the "for each" way of
working through a set of items, and I want it to do enough that I get a good average, I would type
"timeit foreach,10000".
Nice infrastructure for timing tests. Betraying my lack of HC
background, I never the the msg box for this, but rather I have a test
stack with one button and one field, and the butotn's mouseUp handler
does the whole test for me :-)
The results I got for working through 1000 entries, 10,000 times, was:
for each 1075mS
repeat with 1370mS
count array 4250
I think those times are irrelevant. To make them meaningful, you need to
actually *use* the item within the loop, otherwise you don't see the
effects of any efficiency gain or loss. I added the highlighted lines
below, and then re-ran your tests
as-is using item
foreach 85 159
repeatwith 93 3102
countarray 276 367
global someitems,anarray,t
on fillitems
put empty into someitems
repeat with a = 1 to 1000
put random(100) into item a of someitems
end repeat
put someitems into anarray
split anarray by the itemdelimiter
end fillitems
on timeit what,howmany
put the milliseconds into t
repeat with a = 1 to howmany
do what
end repeat
put the milliseconds - t
end timeit
on foreach
repeat for each item tItem in someitems
end repeat
end foreach
on repeatwith
repeat with i = 1 to the number of items in someitems
end repeat
end repeatwith
on countarray
repeat for each element tElement in anarray
end repeat
end countarray
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