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Dennis,
I'm not sure what this problem is d/t - but like I've said before
(remember I'm a computer non-pro) the problem seems related to the
#quotes/unit time coming into AB - that is the bottleneck. Once
the 'limit' is exceed, subsequent quotes can't come 'in' as fast as
they were able to before. If that fraction really describes the
bottleneck then it should not make a difference if you use a tick db
or a 1 hour db (ignoring any overhead that AB might have in determing
its time to start a new bar and the H,L,C of the bar just completed).
I don't think the afl's are the problem because I've seen the same
problems when just running 1 chart of just price, short simple MA and
volume. I don't know if the realtime chart refresh interval has any
influence (I use AB pro and have used refresh intervals from 0 - 15
for my 1 min db without obvious differences). TJ thought my problem
was related to my data provider's plugin - you have a different
provider/plugin I'm sure.
There was a ton of trading after Tues FOMC release... but let us know
if you observe the situation again (or that 1 min ahead of reality
bar I mentioned - which for you would translate to 5 sec ahead of
reality).
Thanks for all you provide to this board.
Dan
--- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@xxx> wrote:
>
> Dan,
>
> I had no more than 3 or 4 tickers updating in a 5 second database.
> The fastest chart timeframe was 1 minute.
> Two charts running with one fast execution time and one slow
execution
> time (0.43 seconds) (.5 sec total time)
> I also have my bar times set to start of bar.
> This is the first time I have noticed this problem.
>
> BR,
> Dennis
>
>
> On Dec 19, 2008, at 10:24 PM, monitorit wrote:
>
> > Almost exactly what I've been questioning - only difference is at
> > worst my lagging data [stock only] reaches market closing data
within
> > 5-15 min after close. The lag is a function of number of tickers
> > updating [generally not a problem when < a dozen, always a problem
> > when >60] and market [not my] trading intensity. As you noted, I
too
> > see the data displayed correct for the time displayed... its just
> > that the time is behind reality. Always corrects with AB exit
and AB
> > restart [no computer shutdown needed]. BTW, I have my charts set
to
> > show bar start (not end) times. If I do a plugin refresh current
> > symbol OR if I restart AB the 1min interval chart will have a
lastbar
> > time that will be 1 min ahead of reality.
> >
> > How many tickers were updating when you noticed the problem?
> >
> > Please share any insights.
> > TIA,
> > Dan
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@> wrote:
> >>
> >> Hello,
> >>
> >> On tuesday this week, after the Fed announcement, I noticed that
> > my
> >> real time ES chart was 12 minutes behind the time of day and my
> > real
> >> time brokers chart. I waited for hours and even into the night
and
> > it
> >> still kept "real time" updates 12 minutes behind real time. The
> >> system clock had the right time. The chart did not have the data
> > at
> >> the wrong time, the data was correct for the time shown. Other
> >> tickers had up to date data.
> >>
> >> Finally I gave up waiting for it to self correct and restarted AB
> > and
> >> the IQ Feed. A soon as it restarted the chart came back to the
> >> current time.
> >>
> >> I am confused. How can the real time chart get in a mode where
it
> > is
> >> not up to current time?
> >> If the data feed was giving 12 minute delayed quote data, that
> > would
> >> do it.
> >> Are there any other possibilities?
> >>
> >> I remember others talking about delayed quotes. Is this
> > describing
> >> the same thing perhaps?
> >>
> >> Best regards,
> >> Dennis
> >>
> >
> >
> >
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