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Hello,
The answer is simple Pentium-4 is marketing trick from Intel,
all they did is to increase the length of the instruction pipeline which helped
to increase clocks speeds to extreme values. Extremely long pipeline however
works in media/streaming data apps but does not work in regular (business) apps.
This was done because buyers pay attention to clock speeds instead
of real performance.
The result is that Pentium-4 in regular applications (excluding streaming media)
is actually slower than Pentium-3 when running same clock speed.
Of course P4 are available with higher clocks speeds and this is what buyers receive
(high clock speed, low performance).
Xeons are faster because they are based on Pentium-III architecture.
Anyway, I strongly recommend Athlons which are more powerful and cost less.
And yes harddisk performance is a big factor if data can not be held entirely in RAM.
So RAM size matters the most.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "tycanadian2003" <tyler.schlosser@xxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Wednesday, June 22, 2005 11:10 AM
Subject: [amibroker] AmiBroker Computer Performance -- What Matters?
> Hi,
>
> I am doing a few studies of my trading system that require a LOT of
> computing power. I need to run a few thousand optimization steps. I
> know CPU matters, but I'm wondering what specifically matters (FLOPS,
> MIPS, Cache size, etc.), as well as what other factors make a big
> difference (RAM, Hard Drive speed, etc.). Basically, I'm curious what
> to emphasize or expect if I were to obtain some new PC's.
>
> Normally I would just test and see what makes a difference, but I am a
> bit baffled by what I am seeing. My stock database is roughly 560 MB.
> Here are some system specs along with backtest times for my system:
>
> P4 1.8 GHz, 1 GB RAM, 10,000RPM SCSI Ultra 160 -- 8.5 minutes
> P4 1.8 GHz, 512 MB RAM, 10,000RPM SCSI Ultra 160 -- 9.2 minutes
> P3 0.733 GHz, 768 MB RAM, 10,000RPM SCSI Ultra 160 -- 9.6 minutes
> P3 0.733 GHz, 256 MB RAM, 10,000RPM SCSI Ultra 160 -- 9.8 minutes
> Dual P4 Xeon 3.06 GHz, 2.5 GB RAM, 10,000RPM SCSI Ultra 320 (running
> two simultaneous instances of AmiBroker, two backtests simultaneously) -
> - 4.1 minutes (total time for a total of two backtests)
>
> Basically, I am wondering why the P4 with 512MB RAM barely outperforms
> the P3 with 256 MB RAM, but the Xeon system is much faster than the P4
> systems. Is hard drive bandwidth really that big of a factor? Both
> the P4 system with 1GB RAM as well as the Xeon system seem to grab all
> the RAM they need (with some still left over).
>
> Any thoughts on this would be welcome. Thanks.
>
>
>
>
>
>
>
>
> Please note that this group is for discussion between users only.
>
> To get support from AmiBroker please send an e-mail directly to
> SUPPORT {at} amibroker.com
>
> For other support material please check also:
> http://www.amibroker.com/support.html
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
Please note that this group is for discussion between users only.
To get support from AmiBroker please send an e-mail directly to
SUPPORT {at} amibroker.com
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