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I think after 10000 symbols, the CPU will become the bottle
neck, not RAM. Also the loading time of 37000 symbols into RAM wouldnt be trival
either.
I personally would suggest importing the data into native
AB format, at least that would increase the loading speed considerably and stick
to no more than 10000 symbols in any backtest.
Hi
Tomasz,
We have just
released our comprehensive US listed + delisted stock database back to
1950. This has over 37000 symbols in it and comprises almost 2GB of data
in MetaStock format. However, the in-memory cache size “max symbols”
setting is limited to 20000 symbols – is it possible to increase this number
for those of our users with plenty of RAM to burn?
Best
regards,
Richard Dale.
Norgate Investor Services
-
Premium quality Stock, Futures and Foreign Exchange Data for
markets
in Australia, Asia, Canada, Europe, UK & USA -
www.premiumdata.net
From: amibroker@xxxxxxxxxps.com
[mailto:amibroker@yahoogroups.com] On Behalf Of Tomasz
Janeczko
Sent: Friday, 11 April 2008 4:05 AM
To:
amibroker@xxxxxxxxxps.com
Subject: Re: [amibroker] Speed issues
with Premium Data
Yes, for best results
increase both, however do not enter more than your RAM size is because then
Windows would swap to hard disk anyway.
Best regards,
Tomasz
Janeczko
amibroker.com
----- Original Message
-----
Sent: Thursday, April 10, 2008 9:44
PM
Subject: Re: [amibroker] Speed issues with Premium
Data
Thank you, Tomasz, I'll try that. Do I also need to
change the "in memory cache size (max. symbols)"?
The PremiumData
database with all the backlisted symbols is huge, so maybe I just haven't
sized the data preferences big enough.
ges
On Thu, Apr 10, 2008 at 12:59 PM, Tomasz Janeczko <groups@xxxxxxxxxxcom>
wrote:
If you want caching and faster use of MS
databases, go to File->Database Settings
and change "Local database
storage" to "Enabled", also you may go to
Tools->Preferences->Data
and increase 'in-memory cache'.
Best regards,
Tomasz
Janeczko
amibroker.com
----- Original Message
-----
From: "ges" <ges8ges@xxxxxxcom>
To: <amibroker@xxxxxxxxxps.com>
Sent: Thursday,
April 10, 2008 8:36 PM
Subject: [amibroker] Speed issues with Premium
Data
> I've used QuotesPlus with AB for quite a while and just
got
> PremiumData's historical data and delisted data and am
having speed
> problems with PremiumData.
>
> With
QuotesPlus, after the first run of an exploration or backtest, AB
>
keeps the data in memory and subsequent runs are very fast and there
>
is not the constant disk access to bog the computer down when doing
>
other tasks.
>
> With PremiumData I can't get the same
behavior. Is this because the
> PremiumData data is in Metastock
format? Or is it my database settings?
>
> I have tried
changing the database settings every way I can think of,
> but I can't
get AB to handle the PremiumData the same speedy way that
> id does QP
data.
>
> Is there some change to database prefs/settings that
will allow AB to
> keep the PremiumData in memory or is this just a
limitation of the
> Metastock data format?
>
> Thanks for
any suggestions.
>
>
ges
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