Although the documentation on message forwarding [1] explains that
alot of stuff needs to happen, it does not say "Warning: Don't do this
in performance-critical applications". So I made a test tool which
forwarded a simple message with one integer argument to a class which
would add it to its 'sum', an instance variable.
Sending this message 10,000 times and comparing the difference in
elapsed time with a similar task that sends a similar message
directly, I found that the average overhead for forwarding one message
on my Intel Core 2 Duo Mac Mini was about 20 microseconds.
That would be unacceptably slow for an iterated operation in a my
application, and I decided to not use message forwarding in this
particular case.
Has anyone ever seen better performance for message forwarding?
Jerry Krinock
[1]
http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/Articles/chapter_13_section_5.html
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