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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.tsho@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
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 amibroker@xxxxxxxxxxxxxxx, "sidhartha70" <sidhartha70@xxx> 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 amibroker@xxxxxxxxxxxxxxx, "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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