|
PureBytes Links
Trading Reference Links
|
There is another method: "max cache size (MB)",
however it only applies when min. 11 symbols is reached.
You can run your windows with /3G switch in boot.ini
this will give you extra gigabyte of addressable space.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "ozzyapeman" <zoopfree@xxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Friday, May 08, 2009 1:34 AM
Subject: [amibroker] Re: AB Crashes when switching symbols
> Tomasz - thanks for the reply.
>
> I am reluctant to use 64 bit AB only because I auto trade and last time I read, people were having issues with AB 64 bit in this
> regard, and I think you also mentioned to consider that package as still experimental.
>
> On AB 5.25 32 bit, reducing max. symbols to 11 does not help in my case, as the 11 symbols in memory are big enough to cause the
> crash.
>
> Would it be possible in the next AB update to somehow allow the user to limit the cache some other way, i.e. not based on number
> of max symbols but on overall memory usage? It should automatically flush data from the cache if it starts to approach overload.
>
> In the meantime, I will reduce the length of my historical data, and see if that helps.
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>>
>> You simply forgot that Windows 32 bit limits applicaiton space to 2GB.
>> It does NOT matter how much you have RAM or page file,
>> as long as you run 32 bit app / windows , the application addressable space is 2GB
>> (or 3GB if running /3G switch in boot.ini)
>>
>> http://msdn.microsoft.com/en-us/library/aa366912(VS.85).aspx
>>
>> There is simply NOT enough memory.
>>
>> 1.25GB is size ON DISK.
>>
>> In memory you need way MORE because you need space not only for data,
>> but also for AFL arrays.
>>
>> Not to mention that Windows usually DOES NOT have that much
>> CONTIGUOUS memory available.
>>
>> Use 64 BIT WINDOWS and 64 BIT VERSION of AmiBroker instead
>> http://www.amibroker.com/x64
>>
>> or ... reduce amount of data if you want to use 32 bit win/app.
>>
>> By the way, this:
>> In-memory cache size (max. symbols): 20000
>> is completely over the roof.
>>
>> Set it to 11 if you want to use very long intraday histories, then AmiBroker
>> will flush unused symbols out of RAM.
>>
>> And ALWAYS the latest (i.e. 5.25) as it uses less memory.
>>
>> Best regards,
>> Tomasz Janeczko
>> amibroker.com
>> ----- Original Message -----
>> From: ozzyapeman
>> To: amibroker@xxxxxxxxxxxxxxx
>> Sent: Friday, May 08, 2009 12:21 AM
>> Subject: [amibroker] AB Crashes when switching symbols
>>
>>
>>
>>
>> Recently I built up my database to include 12 Forex pairs with historical 1-min data going back 10 years or so on each symbol.
>> The total size of the database is only 1.25 GB, which does not seem too bad.
>>
>> The problem is that when I switch charts from one symbol to another, I notice that mem usage in windows task manager indicates
>> that AB (Broker.exe) keeps growing by 150mb or so, each time I switch symbols, and does not go down. If I switch symbols 6 or 7
>> times, AB finally crashes.
>>
>> This is especially cumbersome when I want to Merge each symbol with the latest weekly historical data. After merging a few
>> symbols, AB crashes.
>>
>> I am running WinXP on a dual quad-core with 8GB RAM, with allowable page file up to 25 GB. The crashes happen on AB 5.24 and
>> 5.25. I imagine the same thing would happen on 5.20 but I have not reverted that far back.
>>
>> In AB, I have the following set in
>>
>> Tools--> Preferences --> Data:
>>
>> In-memory cache size (max. symbols): 20000
>>
>> (Max MegaBytes): 1000
>>
>> Number of bars to load: 100
>>
>>
>> AB does not allow me to set max. symbols to any less than 10. I imagine if I could set that to 1 or 2, that would keep the
>> cache sufficiently low in terms of memory usage.
>>
>> So the question is - what settings do I need to set, in the Data tab or other tabs, in order to ensure less memory usage to
>> avoid crashes? Again, I only have 12 symbols in the database, and I imagine many users out there have far more than that.
>>
>> This problem is preventing me from trading more than a couple of symbols at a time, without running into crashes.
>>
>> Any feedback greatly appreciated.
>>
>
>
>
>
> ------------------------------------
>
> **** 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 ****
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
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/amibroker/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/amibroker/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:amibroker-digest@xxxxxxxxxxxxxxx
mailto:amibroker-fullfeatured@xxxxxxxxxxxxxxx
<*> To unsubscribe from this group, send an email to:
amibroker-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|