On Apr 28, 2005, at 5:48 PM, Paul Pogonyshev wrote:
Arend wrote:On Mon, 25 Apr 2005, Paul Pogonyshev wrote:Unfortunately, I was wrong. Performance hit is around 10%: 6885 seconds CPU time against 6106 seconds. Timing may be not very precise as I used the box during regression runs, but the main picture is clear.
Which CPU, compiler? I may try to run some tests myself.
Athlon XP 2500+, GCC 3.2.
On my Pentium M with GCC 3.4, I get about 7-8% performance penalty.
So what do people think about this? Is it too much?
I'm a bit surprised by these numbers. I was under the impression that the overhead of accessing global variables would somehow compensate for the cost of dereferencing. I still think it is a good thing to have, but maybe the idea of using accessor macros to be able to switch that on or off could be given another thought? Maybe something like:
#define board(engine) engine->board
vs
#define board(engine) g_board
Are you interested in numbers using GCC 4.0 on a G4 and /or a G5? If so could someone remind me what's needed to make measurements?
Thanks,
marco
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