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Hello,
You are right - moving from single core/CPU to double core/multithreading is
going to give way larger benefits than move from 32 to 64 bits.
Actually, there can be very little speed increase when going from 32 bit to 64 bit code, if any.
64 bit code does not give ANY computational advantage in regular integer arithmetic (which
is normally 32 bit) and with single precision IEEE (32 bit floating point).
64 bit will benefit only calculations involving large integers (64bit), double floating point (64 bit),
and applications involving addressing more than current 3GB limit of Windows.
On the other hand 64 bit applications are just larger, and it may happen that
it does not fit into in-processor cache as well as 32-bit counterpart, and this gives performance
penalty.
When it comes to AmiBroker, 64 bit vs 32 bit should have pretty marginal effect on speed,
that's why I am thinking that 32bit multi core/processor edition should get more focus.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "b" <b519b@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Wednesday, November 16, 2005 6:42 PM
Subject: Re: [amibroker] AmiBroker Computer Performance -- What Matters?
> Tomasz:
>
> If going from single to dual core (both 32 bit code) will
> give about a 2x speed increase, what is your estimate of
> the speed increase that one might expect when going from 32
> bit 64 bit code?
>
> I know that 64 bit code will theoretically give a huge
> increase in addressable RAM, but that will not affect most
> of us since the current 32 bit Windows code will address 4
> GB which is considerably larger than my database.
>
> Thus any advantage of 64 bit really comes down to
> computational advantages. How much of a speed advantage
> will 64 bit code give Amibroker? My guess is that going
> from single to dual core (both 32 bit) will give more gain
> than going from 32 to 64 bit.
>
> Is this guess right or wrong.
>
>
> --- Tomasz Janeczko <amibroker@xxxxxx> wrote:
>> ... Having this in mind, I am starting to think about
>> implementing multi-core support based on 32 bit code
>> first to avoid problems with external data sources. This
>> will still bring almost 2x speed increase on
>> dual-core processors such as Athlon 64x2 and most recent
>> dual-core Pentiums.
>
>
>
>
>
>
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