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Thanks.
According to this Microsoft page,
"Executables that can use the 3-GB address space are required to have the bit IMAGE_FILE_LARGE_ADDRESS_AWARE set in their image header."
http://www.microsoft.com/whdc/system/platform/server/PAE/PAEmem.mspx
Can you confirm that Amibroker (broker.exe) has the required info in it's image header?
If so, I will try modifying boot.ini with the /3G switch.
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>
> 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@xxx
> 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@ 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/
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__,_._,___
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