By gst
via weblog.plexobject.com
Published: Aug 22 2007 / 03:28
I have been reading Joe Armstrong’s Erlang book recently and one of the assignment is to compare performance of processes and message communication by creating a ring of processes and sending messages. The assignment needs to be done in two languages so I Java as another language.
Comments
bago replied ago:
I don't understand why his java inner classes are not "static": this is a waste of resources. Follower and Loader should be declared static.
I didn't run the benchmark myself, but before running benchmark the code should be written correctly ;-)
andrewm replied ago:
Threads in Erlang are not the same as OS-level threads in Java. they are closer to non-preemptive coroutines. no suprise that you can't allocate a bazillion OS-level threads. Languages like Erlang and Oz are designed to allow the creation of many lightweight threads. For instance, in the Oz book, one example allocates 10,000 threads!
A better performance comparison would allocate multiple activities to a single OS-level thread and switch between them using simple Java classes. It's nowhere near as elegant as in Erlang, but that's the way it is done in Java.
Also, pattern matching as a dispatch mechanism for messages is one of Erlang/Oz's great strengths. I find it more powerful than an object dispatch mechanism.
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