Hello, Incorrect. 1 MB of cache will keep not 250 bars, but as much as 250 THOUSAND (250000) bars.
4 byte per bar in the array. 4000 bytes per 1000 bars and 4MB per million bars in a single array. Best regards, Tomasz Janeczko amibroker.com ----- Original Message ----- From: "paultsho" <[email protected]> To: <[email protected]> Sent: Saturday, August 22, 2009 3:52 PM Subject: [amibroker] Re: AmiBroker 5.28.0 BETA released > That depends on how many arrays you use in your afl. > for example, if each field on a record is loaded, it uses up 40 bytes > but each array is only 4 bytes * nSize. 1 M of L2 cache will keep 250 bars of > a single array, ie 25000 bars will need 10 M of > cache. There are roughly 400 bars of 1 min per day session or 2000 bar per > week. > > --- In [email protected], "sidhartha70" <sidharth...@...> wrote: >> >> Brilliant TJ. Thanks. >> >> Question... I want to start looking at some n-sec timeframes. >> >> Mainly 15 sec, and 30 sec. >> I currently use a 25,000 bar 1 min DB which runs super quick because it >> keeps all the data within the CPU cache, and also gives >> me about a weeks work of data on the e-mini's which is all I need for day >> trading. >> >> To get 15 sec & 30 sec intervals, I assume I am best to set my DB base >> interval to 15 sec, and then set a 30 sec interval up via >> preferences>intraday....?? >> >> Any ideas how far I can push the number of bars to in my DB and keep all the >> data in CPU cache still to keep the speed high...?? >> >> I'm running an Intel Xeon X5365 CPU. >> >> TIA >> >> --- In [email protected], "Tomasz Janeczko" <groups@> wrote: >> > >> > Hello, >> > AmiBroker 5.28.0 BETA released: >> > >> > http://www.amibroker.com/devlog/2009/08/22/amibroker-5-28-0-beta-released/ >> > >> > >> > Best regards, >> > Tomasz Janeczko >> > amibroker.com >> > >> > > > > > ------------------------------------ > > **** 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 > > >
