On 14 Jan 2006, at 23:52, Helge Hess wrote:
Richard Frith-Macdonald wrote:
I'd like to get GNUstep working properly in the 64bit environment ...
it seems to be considerably faster than the 32bit environment on the
same machine (I had expected it to be about 20% faster but it seemed
more like double the speed when I was compiling).
Do you have an idea why this is? I would expect a 64bit env to be
quite
a bit _slower_ than a 32bit one for regular applications (<2GB memory
requirement, object oriented) due to the massively higher (ptr) memory
overhead and load times?
I think I foolishly spoke much too soon and had the wrong impression.
Going back and doing the same things again I found no significant
speed difference between the two environments, and after thinking
about it a bit I now suspect that disk i/o is the main issue ... and
I probably got the spurios impression of a major speed difference
because I compiled the base library first in the 32bit environment
(wheren everything had to be read from disk) and later in the 64bit
environment the system already had everything it needed in memory.
Obviously we need well designed benchmarks run repeatedly rather than
quick initial impressions of performance.
While the benchmark program in the base library can not be described
as well designed or comprehensive etc ... I thought it might be
interesting to run it anyway. It is at least a test of ObjC code
perfomance without and disk I/O (other than loading the program
itsself).
Unfortunately it was written for times when processors were much
slower .. and takes only about 7 seconds to run ... but it would
appear to show that the 64bit and 32bit code runs at pretty much the
same speed. Repeatedly running the benchmarks I found that the 64bit
code was consistently a little faster ... typically 7.03 seconds when
the 32bit version took 7.32 seconds, but I doubt that the difference
is really very meaningful.
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