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TJ,
Just to illustrate the 'black magic element' of all this... I just set up one line of code as you suggested,
Buy = 1;
I've now run a few scans across my filter watchlist using that code.
So far I've seen variations in scan time from 22 seconds to almost 4 mins... that's using an IQ Feed DB.
Is this kind of behavior normal...?
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>
> You don't provide any formula or any details to help you,
> but you should try
>
> Buy = 0; Sell = 0;
>
> scan. It will show you "data access" only speed. It is *BASE* time
> below which you can go down because the data source is limiting you.
>
> On my eSignal intraday database that has 200000+ bars per symbol
> scanning 124 symbols with such basic formula takes 6 seconds
> (all symbols streaming and backfilled already)
>
> Any time above that base time is caused by the formula you wrote.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "sidhartha70" <sidhartha70@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Tuesday, September 01, 2009 11:39 PM
> Subject: [amibroker] Re: Scan times
>
>
> > TJ,
> >
> > doesn't seem to help... I'm running it now with 'wait for backfill' unchecked. Same huge wait time.
> >
> > Scan's are like black magic I find... the time they take seems to bear no resemblance to the code behind them... worse than that,
> > I have seen huge variations in the time taken to run exactly the same scan across the same number of bars & same symbol list.
> >
> > Often they seem to jam up or have a 'mini hang'.
> >
> > I'm at a loss. Any ideas...? 14 mins can't be right. Anything more than a couple of mins can't be right surely...? Even that
> > sounds a lot.
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@> wrote:
> >>
> >> Uncheck "wait for backfill".
> >>
> >> Best regards,
> >> Tomasz Janeczko
> >> amibroker.com
> >> ----- Original Message -----
> >> From: "sidhartha70" <sidhartha70@>
> >> To: <amibroker@xxxxxxxxxxxxxxx>
> >> Sent: Tuesday, September 01, 2009 9:54 PM
> >> Subject: [amibroker] Scan times
> >>
> >>
> >> > I'm confused.
> >> > I have a scan that I call every 5 mins (or hope to). This scan is used to set up a series of static arrays that I use elsewhere
> >> > in
> >> > my code.
> >> >
> >> > The scan code is 30 lines long. A 'check' of the code says it takes 0.035 secs to run.
> >> >
> >> > I'm running the code over a defined filter which is a watch list of symbols. It runs across 24 symbols.
> >> >
> >> > My DB has 100,000 bars in it.
> >> >
> >> > Even with everything backfilled, I have seen this scan take 14 mins to run. That can't be right can it...??
> >> >
> >> >
> >> >
> >> >
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> >
> >
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