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...and one more question: I have a number of computers. One runs WinXP 32 bit, with 32 Bit AB 5.25, which I would test out this /3G boot.ini switch.
The other PC is running Vista Ultimate 64 bit with same 32 Bit AB 5.25. Does the /3G switch apply also to VistaU64? If not, what is recommended on VistaU 64 to manage memory on the AB database in order to reduce crashes?
--- In amibroker@xxxxxxxxxxxxxxx, "ozzyapeman" <zoopfree@xxx> wrote:
>
> 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@> 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@
> > 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:
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