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Why do you think so? I am using 60000+ symbols QP2 database
(stocks and all mutual funds) without any speed issues.
It does not matter for the CPU how many symbols are
there.
Still you are correct that AB native format would be
fastest.
Best regards,
Tomasz
Janeczko
amibroker.com
----- Original Message -----
Sent: Friday, April 11, 2008 6:34
AM
Subject: RE: [amibroker] Speed issues
with Premium Data
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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