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Hello,
That depends if given symbol is in the "active" (i.e. streaming) list or not.
If it is - then turning on/off "wait for backfill" does not make difference.
If it is not, then with "wait for backfill" turned on it will of course wait for "missing" bars
before proceeding to next symbol.
Charts on the other hand, always refresh immediatelly with data that are present right now.
If symbol is not present in the active list it is automatically added and backfill request
may be sent but this does not block chart from refreshing - it will refresh immediatelly,
and once backfill data eventually arrives it will refresh once more.
In other words - charts are asynchronous with regards to backfill. AA can be synchronous
("wait for backfill" turned ON) or asynchronous ("wait for backfill" turned OFF).
That's the only difference. AFL execution IS IDENTICAL regardless where it occurs.
Of course with different zoom levels / different AA range you may be using different number of bars,
but that should be obvious.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "sidhartha70" <sidhartha70@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Tuesday, August 04, 2009 5:14 PM
Subject: [amibroker] Re: Speeding exporation intraday
> I'd be interested to hear TJ's answer on this eToke...
>
> Because I was asking from very similar questions of support & TJ recently... namely that equivalent AFL on charts seems to execute
> much quicker than a scan or exploration. Which obviously leads one to think that other operations that occur in a scan or
> exploration, outside of the AFL execution, are what take the time...
>
> Why this time is greater with a streaming feed I don't know...
>
> --- In amibroker@xxxxxxxxxxxxxxx, "etoketrader" <etoke@xxx> wrote:
>>
>> Hi, for testing I am currently running:
>>
>> n Last quotations = 1
>> A very basic AFL code which lists closing price.
>> QuickAFL turned on
>>
>> I am concerned about the comparison between how it runs outside of market hours vs how it runs during.
>>
>> BR,
>> eToke
>>
>>
>>
>> --- In amibroker@xxxxxxxxxxxxxxx, "sidhartha70" <sidhartha70@> wrote:
>> >
>> > How many quotations are you running the explorations over...?
>> >
>> > --- In amibroker@xxxxxxxxxxxxxxx, "etoketrader" <etoke@> wrote:
>> > >
>> > > Tried that. I always run the first backfill before market hours. After that, backfill setting does not seem to make any
>> > > difference as long as everything has already been backfilled and all symbols are streaming.
>> > >
>> > > BR
>> > > eToke
>> > >
>> > >
>> > > --- In amibroker@xxxxxxxxxxxxxxx, "murthysuresh" <murthysuresh@> wrote:
>> > > >
>> > > > backfill before the start of the market hours. turn off backfill as you only need to do it at the beginning of the session.
>> > > >
>> > > > --- In amibroker@xxxxxxxxxxxxxxx, "etoketrader" <etoke@> wrote:
>> > > > >
>> > > > > Hi,
>> > > > >
>> > > > > I currently run IQFeed on 500 symbols. Exploration outside of market hours run under 1 minute but slow down to 6 minutes
>> > > > > during market hours.
>> > > > >
>> > > > > Can anybody recommend some ideal settings to speed up intraday explorations while streaming?
>> > > > >
>> > > > > thanks,
>> > > > > eToke
>> > > > >
>> > > >
>> > >
>> >
>>
>
>
>
>
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