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one thing you don't provide is how your data base is
setup. Is it using a plugin? Is the "Data Source" set to "(local
database)" with the "Local Ddata storage" set to "Enable"? What is the
"Number of bars..." set to?
d
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.
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Please note that this group is for discussion between users only.
To get support from AmiBroker please send an e-mail directly to
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