Tuesday, March 8, 2011

market data engines hate java autoboxing

(See also post on market data and size of Object)

High volume market data systems deal with primitives like ints, chars and bools (bit) These often need to go into collections, like vector of int. These systems avoids runtime memory allocation like a plague.

Specifically, Java collections auto-boxing results in excessive memory allocation -- a new object for every primitive item. A major justification for c++ STL, according to a CS veteran.

Sun also says autoboxing is inappropriate for high performance.

C# generic collection is free of autoboxing, just like STL.

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