|
PureBytes Links
Trading Reference Links
|
If scan times vary that much on your end it may mean that your scan
is triggering backfill over and over again. This may happen if you are exceeding
the symbol limit of your subscription. You should check File->Database Settings->Configure
"number of streaming symbols" - this should be set to number equal to
your subscription limit and the total number of symbols under scan
and currently displayed in charts and in RT window should not exceed
that limit. Otherwise constant backfill requests will slow down the operation
because IQFeed does take time to respond to backfill request.
As I wrote, when all symbols are on the RT streaming list and backfilled already, it takes 6 seconds to run
such scan on 124 symbols.
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "sidhartha70" <sidhartha70@xxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Wednesday, September 02, 2009 9:46 AM
Subject: [amibroker] Re: Scan times
> TJ,
>
> Sorry. I should have mentioned, I have n=1 and 'n last quotations' selected.
>
> TIA
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>>
>> Hello,
>>
>> PRECISION. That is a key word. Follow precisely what I write.
>>
>> I wrote something different:
>>
>> Buy = 0;
>>
>> *NOT* 1
>>
>> It makes huge difference because with 100000 bars, buy = 1 means
>> OUTPUTTING 100000 lines of texts per symbol, so in your case it will be outputing
>> 2.4 million lines of texts. Not something that can be done in few seconds.
>>
>> Best regards,
>> Tomasz Janeczko
>> amibroker.com
>> ----- Original Message -----
>> From: "sidhartha70" <sidhartha70@xxx>
>> To: <amibroker@xxxxxxxxxxxxxxx>
>> Sent: Wednesday, September 02, 2009 12:37 AM
>> Subject: [amibroker] Re: Scan times
>>
>>
>> > 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@> 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@>
>> >> 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...??
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >> > ------------------------------------
>> >> >> >
>> >> >> > **** 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
>> >> >> >
>> >> >> >
>> >> >> >
>> >> >>
>> >> >
>> >> >
>> >> >
>> >> >
>> >> > ------------------------------------
>> >> >
>> >> > **** 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
>> >> >
>> >> >
>> >> >
>> >>
>> >
>> >
>> >
>> >
>> > ------------------------------------
>> >
>> > **** 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
>> >
>> >
>> >
>>
>
>
>
>
> ------------------------------------
>
> **** 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
>
>
>
------------------------------------
**** 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
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/amibroker/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/amibroker/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:amibroker-digest@xxxxxxxxxxxxxxx
mailto:amibroker-fullfeatured@xxxxxxxxxxxxxxx
<*> To unsubscribe from this group, send an email to:
amibroker-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|