I knew I was wrong as soon as I wrote it. I was out by 1000.
--- In [email protected], "Tomasz Janeczko" <gro...@...> wrote:
>
> 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" <paul.t...@...>
> 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" <sidhartha70@> 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
> >> >
> >>
> >
> >
> >
> >
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