In order to get the element specified in ListGetAt, CF still has to work
through the list and find that element, which still means reading each
character etc etc.
You can do the same with an array without calling a funciton...
nameofarray[elementno]
If you can, use arrays over lists.
At 12:23 2/06/00 -0400, you wrote:
>your tests suggest looping through lists performs slower than other data
>structures. however, what about list functions like ListGetAt()? list
>functions are a large reason why i choose lists over arrays most of the
>time.
>
>mike
>
> > -----Original Message-----
> > From: Chris Evans [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, June 01, 2000 1:32 PM
> > To: [EMAIL PROTECTED]
> > Subject: RE: Another question on performance -- better than lists?
> >
> >
> > I just ran some tests, and was surprised by the results.
> >
> > Caveats:
> >
> > 1) These are simple looping tests, and only give a general idea of speed.
> > YMMV.
> > 2) Use the most reasonable variable type for the job.
> > Converting a list to
> > an array to use array functions may negate any performance gains you may
> > see. If you are looking for a value, and you only know its name, use a
> > structure.
> >
> > The tests:
> >
> > I created a series of simple loop statements for each variable type:
> > Queries, Arrays, Structures, and Lists. They were all equivalent to a
> > 2-dimensional array. Each "Set" loop consisted of 5000
> > iterations. I then
> > created another set of loops of 100 iterations to grab some values.
> >
> > Summary:
> >
> > I expected Structures to be fastest, but that honor went to Arrays.
> > Arrays are followed closely by Queries. Structures were a little slower,
> > and lists took *forever*. Structures are very powerful, and
> > definitely have
> > performance gains if you are dealing with keys/values, but are not
> > inherently faster.
> >
> > Results:
> >
> > Query Set Time: 3515 ms
> > Query Get Time: 10 ms
> > ------------------------------------------------------------------
> > ----------
> > ----
> > Array Set Time: 3174 ms
> > Array Get Time: 10 ms
> > ------------------------------------------------------------------
> > ----------
> > ----
> > Struct Set Time: 5368 ms
> > Struct Get Time: 20 ms
> > ------------------------------------------------------------------
> > ----------
> > ----
> > List Set Time: 47248 ms
> > List Get Time: 711 ms
> >
> >
> > If anybody wants to see the test code, let me know and I'll mail
> > it offlist.
> > If anybody else has done any testing, I would like to see those results as
> > well.
> >
> > Chris Evans
> > [EMAIL PROTECTED]
> > http://www.fuseware.com
> >
> >
> > -----Original Message-----
> > From: Mike Amburn [mailto:[EMAIL PROTECTED]]
> > Sent: Thursday, June 01, 2000 10:21 AM
> > To: [EMAIL PROTECTED]
> > Subject: RE: Another question on performance -- better than lists?
> >
> >
> > > ok... so when it comes to performance, it's better to use
> > > strutctures than
> > > arrays and both of those are better than lists.
> >
> > i thought lists were always fastest. is this not true? when did
> > this happen?
> >
> > mike
> >
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