It appears that using the registry tweaks will allow setting the database size to some arbitrary large number, like 5 billion, but will this database size impact backtesting speed and RAM requirements? For example, if I store a month's worth of tick data and only backtest on a single day, will Amibroker load the entire dataset or just the bars needed? In case it is just the bars needed, is this the parameter specified by NumberOfBarsToLoad in tools->preferences->data?
--- In [email protected], "Tomasz Janeczko" <gro...@...> wrote: > > Yes that is all correct. And keep in mind that memory is needed for data alone (64 bytes per bar) > and AFL arrays during processing. 10million bars would be 640MB of continuous RAM + array memory (4 * number of bars * number of arrays > used in AFL) which can be problematic. Imagine 10 symbols -> 6.4 GB for quotation data. > So 200 symbols TICK data (10 million bars each) for 4 years - no it is unrealistic for physical hardware you have > unless you run 64 bit version with lots of RAM. > Sure the program can keep data on disk and does that, but currently used data (including any foreigh calls) > must be in RAM plus minimum in-memory cache size is 11 symbols. > > Best regards, > Tomasz Janeczko > amibroker.com > ----- Original Message ----- > From: Paul Ho > To: [email protected] > Sent: Thursday, November 13, 2008 10:54 AM > Subject: RE: [amibroker] Maximum tick data AB can handle ? > > > The canned version handles 500,000 bars, but if you ask Tomasz, there is a registry tweak to increase it to whatever system can handle, the more bars, the slower it is. > For example, I have 2 years worth of tick data for INDU, and is 2.5M bars. Depending on what you're storing, it could be more or less. > If you are storing something like emini, you'll need to set it to 5 - 10M bars for 4 years. > > > ---------------------------------------------------------------------------- > From: [email protected] [mailto:[email protected]] On Behalf Of thariman > Sent: Thursday, 13 November 2008 5:58 PM > To: [email protected] > Subject: [amibroker] Maximum tick data AB can handle ? > > > Tomasz, > > What is the maximum tick data AB can handle ? > I need to be able to store about 3-4 yrs worth of tick data for about 200 symbols. > Is this possible in AB ? > Or is it possible to store natively n-contracts records ? > > Thanks, > > Tony >
