Re: [cp-patches] Patch: Opening RandomAccessFiles requires excessive permission

[David Daney]

Christian Thalinger wrote:
> On Tue, 2005-12-06 at 10:00 -0600, Archie Cobbs wrote:
>
> > That's getting into the micro-optimzation realm, which is
> > fraught with danger and mistaken assumptions :-) E.g., on
> > some machines the time overhead of setting up a try/catch in
> > a method that wouldn't otherwise have one is higher than
> > the single comparison required to test for null. In particular,
> > any interpreter is going to have to test for null anyway,
> > so the second time it's already in cache, blah blah, etc.
>
>
> "...setting up a try/catch..."?  What do you mean?  Agreed on the
> interpreter thing, but who does benchmarks on interpreters?

On gcj using SJLJ exceptions there is overhead for entering a try block. 
 And for the dwarf unwinder there is overhead in the unwinding tables 
(but not in the code) for each try/catch.

That you don't care about the implications for platforms other than your 
own, does not imply that they do not exist.

David Daney