chanwit wrote:

Th Ng runtime system executes floating point operations about 30% slower than pure Java (i.e. if Java takes 1 second Ng takes 1.3 seconds) if the operands are statically typed as float.

If the operands are untyped Ng is just under twice as slow as Java for floating point arithmetic.

The runtime system allows the behaviour of the operations to be changed on the fly via either a Category or the direct manipulation of the MetaClass for float.

You can have any number of Categories in operation and they will make no difference to the performance unless the category changes the semantics of an operation on float.

As the Ng runtime system supports semantics which are virtually identical to Groovy for arithmetic operations on primitive types (Groovy returns a double as the result of an operation on two floats Ng returns a float) I would say that the papers you are reading are tosh :)

John Wilson

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