You can find the code below. I just change the call to m by m1 to test the two methods.

I started again in a fresh pharo 6 image and now the results seem all similar for the following code. I will do all my tests again to see if it was my fault but it takes a lot of time (2 hours for each full test).

What sould be the expected results ? Should an instance of an anonymous class be as fast as a regular instance when calling the same code, being defined in the anon class or its super class ?

A implements m ^100 printString and B subclass of A implements m1 ^100 printString

a := B new.

class := A newAnonymousSubclass
        addSlot: (InstanceVariableSlot named: #y); compile: 'm1
    ^100 printString'; yourself.
c := A new becomeForward: class new.

res := Dictionary new.
col1 := OrderedCollection new.
col2 := OrderedCollection new.

10000 timesRepeat: [
    Smalltalk garbageCollect .
    col1 add: [1000000 timesRepeat: [ a m ]] timeToRun].

10000 timesRepeat: [
    Smalltalk garbageCollect .
    col2 add: [1000000 timesRepeat: [ c m ]] timeToRun].

res at: 'a' put: col1.
res at: 'c' put: col2.
res inspect

Steven.

Le 2017-06-16 17:31, Denis Kudriashov a écrit :

Hi Steven.

 

Could you show code which you measure?

2017-06-16 17:17 GMT+02:00 Steven Costiou <steven.costiou@kloum.io>:

I have been playing a bit with anonymous subclasses, and instances of anon subclasses seem slower to execute code than "regular" subclasses instances, but sometimes they reach equivalent performances (for code defined in anon-subclasses). I don't understand why.

I have a class A with a method m.
B is subclass of A with a new method m1.
Anon-A is an anonymous class of A which also implements the m1 method.

I did various tests of speed and:

- when executing m, compiled in A, instances of Anon-A are around 10% slower than instances of B

- when executing m1, compiled in B and in Anon-A, performances are equivalent between instances of B and of anon-A

Is that a particular behavior of anonymous subclasses, like their instances can easily find behavior defined in their class but have to perform extra-work to find methods defined in their superclass (which is not anonymous) ? Is that vm related ? Other ?

Steven.