Re: [amibroker] Data Math

["Tomasz Janeczko" <groups@xxxxxxxxxxxxx>]

Hello,

No. AmiBroker is smart enough not to require all data to be loaded at the same time.
It goes through symbols sequentially in first pass, collects signals, compresses them
so they take minimum required memory, then second phase occurs (actual backtesting).
This way you can backtest _way_ more data that you have RAM in your computer.

Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message ----- 
From: "progster01" <progster@xxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, October 05, 2007 11:15 PM
Subject: [amibroker] Data Math


> 
> 64 bytes per quote x 500,000 bars (default max # saved) = 32 MB
> for a single quote array (e.g. Open)
> 
> For OHLCV:  32 MB x 5 = 160 MB
> 
> 10 x 160 MB = 1.6 GB
> 20 x 160 MB = 3.2 GB
> 
> 500,000 / 1440 minutes-per-day = @ 347 days
> 
> So, depending on the specifics of computer memory, which quotes you
> are using, etc., you could backtest on a portfolio of something like
> 10 - 20 symbols with something like 2 years of minute data per symbol.
> 
> Is that approximately right?
> 
> 
> 
> 
> 
> 
> 
> 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 NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> http://www.amibroker.com/devlog/
> 
> 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.

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