Andrew,
In theory yes you are right, but remember that a 64bit Integer can also
be calculated by a 32bit processor, but only in two CPU cycles, this is
where the theoretical advantage of the 64 bit architecture lies.
However in reality introducing the 64bit processor also introduces a
number of new hardware related problems (peak bandwidth, sustained
bandwidth, access latency), which have to do with he amount of data that
two components (i.e. the CPU and RAM) can exchange over a given period.
The catch 22 is that with increased processing power, the latency
problem is getting worse (a side-effect of faster CPU's is more bus
cycles worth of delay for each memory access) Vendors are trying to
compensate in various ways, for example widening the bus. So, a 64bit
processor alone cannot speed up your application, the 12G RAM will help,
but your actual bandwidth may not be, in real terms, too different from
a 32bit system with far less RAM because of latency problems. 64bit
hardware designs are improving... this is where the real promise lies.
I hope this explanation is a bit clearer, lol
Peter
Andrew Miehs wrote:
On 30/07/2007, at 8:02 AM, Peter Stavrinides wrote:
Apologies Ron this was supposed to be directed at Andrew Miehs!
Peter Stavrinides wrote:
From your comments Ron you obviously didn't understand a thing I
wrote, because you have just repeated me!
Dear Peter,
Obviously! :-)
On 29/07/2007, at 2:34 PM, Peter Stavrinides wrote:
This is currently where the true benefit of switching to a 64-bit
processor lays, it has nothing to do with the memory address
space, which is exactly that, just space for more complex
computations
I was mainly referring to this sentence.
It is NOT true to say that it has nothing to do with memory space.
Some of our Java processes are running > 12G RAM - this would not be
possible with 32bit - at least not with Java.
(Yes it could be done with multiple processes and some for of
communication between them)
Memory space is ONE of the factors - and to be honest the one that was
more important for our application than the 15% speedup.
Regards
Andrew
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Peter Stavrinides
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