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Yes
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "polomorabe" <paul.moore@xxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Saturday, September 12, 2009 5:59 PM
Subject: [amibroker] Re: Backtest execution speed.
> Thanks Tomasz,
>
> One final question, to help me understand this better. Using the "local database" as the source means that the external database
> (TC2000) is not used, right? This mans that when AB is started, the database is not updated with TC2000's latest updates, since
> the last time AB was used?
>
> Does this mean that if I want to run several backtests, I run the first one with TC2000 as the source, and for subsequent
> backtests, use "local database" as the source?
>
> Paul
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>>
>> Hello,
>>
>> Well 16 minutes for 3700 symbols backtest is not bad (especially considering the fact
>> that it is outside of capabilities of any other T/A software - which will simply blow up and refuse to take that many symbols).
>>
>> TC2000/TCNet is slow. And no data from TC are not retrieved from "RAM".
>> They are retrieved by calling TC API which is slow (TC is visual basic program), even
>> if data are in cache the plugin still needs to check if data were not updated in the meantime
>> and it takes time because of TC API.
>>
>> If you are trying to run backtest at maximum speed switch data source to "(local database)".
>>
>> And do not use "TuneUp" and any other "enhancers", "boost" , "turbo" programs because all they do is just eating CPU cycles and
>> memory
>> and cause problems.
>>
>> Best thing you can do is to install Windows WITHOUT any add-ons.
>>
>> Best regards,
>> Tomasz Janeczko
>> amibroker.com
>> ----- Original Message -----
>> From: "polomorabe" <paul.moore@xxx>
>> To: <amibroker@xxxxxxxxxxxxxxx>
>> Sent: Saturday, September 12, 2009 2:10 PM
>> Subject: [amibroker] Backtest execution speed.
>>
>>
>> > I've been backtesting ideas, and would like to get some feedback about backtest performance.
>> >
>> > I'm using a 3GHz P4 machine with 2GB RAM under WinXP, and when I work on a collection of about 3,700 symbols, the execution
>> > time
>> > is 20 minutes on the first run, and 16 minutes thereafter. I have configured the database as follows, to ensure that the
>> > database
>> > is kept in RAM after the first run:
>> > On Tools->Data:
>> > - In-memory cache size (max symbols): 10,000
>> > - Max megabytes: 1000
>> > On File->Database Settings:
>> > - Data source: TC200x/TCNet Plug-in
>> > - Local data storage: <enable>
>> >
>> > When executing, I notice at the bottom on the screen that each ticker retrieval takes 12-16 ms. Is this a normal response time
>> > for
>> > data that is supposedly being accessed from RAM? Using TuneUp 2009, I confirmed that the memory was not full during the test
>> > (42%
>> > free).
>> >
>> > I'm using AB professional v5.2.
>> >
>> > Can anyone help, or have I misconfigured something?
>> >
>> > Many thanks,
>> > Paul
>> >
>> >
>> >
>> > ------------------------------------
>> >
>> > **** IMPORTANT PLEASE READ ****
>> > This group is for the discussion between users only.
>> > This is *NOT* technical support channel.
>> >
>> > TO GET TECHNICAL SUPPORT send an e-mail directly to
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>> >
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>> >
>> >
>> >
>>
>
>
>
>
> ------------------------------------
>
> **** IMPORTANT PLEASE READ ****
> This group is for the discussion between users only.
> This is *NOT* technical support channel.
>
> TO GET TECHNICAL SUPPORT send an e-mail directly to
> SUPPORT {at} amibroker.com
>
> TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> http://www.amibroker.com/feedback/
> (submissions sent via other channels won't be considered)
>
> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> http://www.amibroker.com/devlog/
>
> Yahoo! Groups Links
>
>
>
------------------------------------
**** IMPORTANT PLEASE READ ****
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