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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.
>
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