Loops in Smalltalk
cputney at wiresong.ca
Sun Jun 27 17:17:22 UTC 2004
On Jun 27, 2004, at 11:49 AM, Kenneth Johnsen wrote:
> I read an article about the new version of Dataflex, where it said
> that the time it took to do 5000 get/set operations had been reduced
> from 58 to 3 seconds.
> I read it like: set and get an instance variable on an object 5000
> times, but I presume that something more advanced is going on
> (otherwise, it's not that impressive).
> But this got me wondering: how long does it take in Smalltalk?
> So, I made a small class, with one instance variable: instancevar, and
> three methods: instancevar, instancevar: and runTest. The two former
> just gets/sets instancevar, and runTest does:
> | anInt |
> ^ Time
> millisecondsToRun: [1
> to: 5000
> do: [:z |
> self instancevar: z.
> anInt := self instancevar.
> Transcript show: anInt printString;
> Now, I didn't have the "Transcript show" in it the first time I ran it.
> Squeak printed: 1
> Dolphin printed: 1
> Question 1: Very nice. But am I missing something, where the compiler
> figures out that my instancevar is not used for anything else, and
> ignores it?
Nah, it's just that Smalltalk can do 5000 get/sets in less than a
millisecond. On your machine, anyway. Mine takes 3 milliseconds for
this test. Try 50,000 iterations.
More information about the Squeak-dev