Mik and I did some decompiling of inter-type declarations tonight. For the
example we looked at, the generated code for a declare implements had the
same structure as a straight inter-type declaration. Inter-type
declarations are not directly inlined, but follow a structure that adds
two addtional method calls into the chain. However, I would expect a JIT
to inline the code so that the performance numbers should be much closer.
We will ask one of the performance team to look at this tomorrow.
I'm sure Jim will have a much deeper insight on this...
-- Adrian
Adrian_Colyer@xxxxxxxxxx
"Gregor Kiczales" <gregor@xxxxxxxxx>
Sent by: aspectj-dev-admin@xxxxxxxxxxx
14/07/2003 18:59
Please respond to aspectj-dev
To: <aspectj-dev@xxxxxxxxxxx>
cc:
Subject: [aspectj-dev] FW: [aspectj-users] Using AOP to
implement double dispatching technique
this thread contains some performance numbers that make AspectJ look bad
anyone already know what's going on here? If so, and you don't have time
for a long message, send me a note and I'll write it up.
But one way or another we should reply, before this 10x AspectJ
performance
hit becomes an "established fact".
-----Original Message-----
From: aspectj-users-admin@xxxxxxxxxxx
[mailto:aspectj-users-admin@xxxxxxxxxxx] On Behalf Of Vankeirsbilck, Rudi.
(BE - Merelbeke)
Sent: Thursday, July 10, 2003 7:14 AM
To: aspectj-users@xxxxxxxxxxx
Subject: RE: [aspectj-users] Using AOP to implement double dispatching
technique
It is the result of the "introduction"-code.
You say that the introductions are really "inserted", are you sure that
ajc does not wrap them with other infrastructural code? That could
explain the difference in performance.
After applying the redesign to introduce an interface Screen performance
has decreased again:
Testing display of points using immediate method dispatching:70
Testing display of points using double dispatching:230
Testing display of graphical elements using instanceof and casting:230
Testing display of graphical elements using AOP:621
Therefor, I am really convinced that ajc does some wrapping somewhere.
Decompiling the code confirms this. There are a number of (static
however) methods that wrap around the calls.
Rudi.
-----Original Message-----
From: Stefan Hanenberg [mailto:shanenbe@xxxxxxxxxxxxxxxxxxxxxxx]
Sent: donderdag 10 juli 2003 15:47
To: aspectj-users@xxxxxxxxxxx
Subject: Re: [aspectj-users] Using AOP to implement double dispatching
technique
Testing display of points using immediate method dispatching:70
Testing display of points using double dispatching:240 Testing display
of graphical elements using instanceof and casting:250 Testing display
of graphical elements using AOP:351
just a question:
Is this measurement the result of the "around"- or the
"introduction"-code?
From my point of view the introduction code's performance cannot
distinguish from the double-dispatch, because it is exactly the same
code (introductions are really just "inserted").
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