...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 [email protected], "ozzyapeman" <zoopf...@...> 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 [email protected], "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: [email protected] > > 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 [email protected], "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: [email protected] > > >> 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 > > > > > > > > > > > >
