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Dennis,
Thanks. I hope I've not set AB up wrong - don't think so. AB is in 1
window. The 5 symbol linked charts (each created from file>new>blank
chart are all visible simultaneously) - each with a different time
interval - the MDI option is off. The charts are 1min, 2min, 5min,
15min & daily. If I run an explore in 5min periodicity, AB will run
through 100 symbols in ~ 3 seconds total... usually generating 10-30
hits. The output includes most of the indicators on the 5 min
chart. The chart itself takes 3-4 sec to draw when I move from 1 sym
to another. So... all those 100 sym MUST have been calculated in the
background because many/most of those symbols were not charted that
day. I keep hitting my head on this - how often are these symbols
being recalculated... is it everytime a new price comes in? is it
controlled by the preference>intraday>chart refresh? is it just when
a new bar appears (ie, a bar is completed). If it is the first
choice, can you think of any code that would decrease the frequency
or limit it to just when the bar is completed?
If I want to continue w AB in RT mode, I have to solve this problem.
I will just run a single window of price/vol and just 1 short MovAvg
for the coming week to see if my data problem goes away - or not.
BTW- for clarity my db is 7400 bars/symbol (740000 total bars=23 Meg).
I have not used setbarsrequired as each chart calls for bar0---last
in 3 loops of the afl (& no arrays in loops). When I change chart
sym, the charts are finished drawing in 1-2 sec (it takes another 2
sec or so to finish writing some plottext statement - and that might
be d/t my refresh rate).
Dan
--- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@xxx> wrote:
>
> Dan, my comments are embedded:
>
> On Jun 27, 2008, at 10:23 PM, monitorit wrote:
>
> > Hi Dennis,
> > Perhaps you can help me - you'd be the first on this problem :(
> > The problem I described is ~daily.
>
> I will do my best..
>
> > MY AB workspace displays the quotes window, 1-2 t&s windows + 5
> > symbol-linked chart windows (1 min, 2 min, 5 min, 15 min and
daily).
> > Each chart window has 8 sheets - but all these are empty except
the
> > first sheet with 1-3 panes each and 1 window has a study on the
> > second sheet. Total time (sum) for the 5 charts via 'display
chart
> > timing' is ~400 msec. Running through these charts afterhours is
no
> > problem (local db is enabled).. I see all charts windows
completed in
> > about 4 seconds after changing symbols.
>
> My charts are as simple as I can make them. Just one Main chart
which
> run everything. Can run as fast as 200ms to as slow as 10s
depending
> on the trading parameters I am using and the amount of history and
> especially the number of bars I am displaying. I might have
another
> simple chart running in another tab just to keep another symbol
> database up to date.
>
> > What do you think are the best settings for the pref>data
> > tab 'default db settings' in-memory cache size (max symbols),
(max
> > megabytes) and number of bars to load... for a 7400 bar, 100
symbol
> > db (and perhaps for a longer db with more symbols). What do these
> > fields actually mean/do?
>
> Good questions, wish I knew all those answers. My settings:
>
> I only run about a dozen symbols.
> I keep 300,000 5 second bar database
> Cache max 82 MB.
> I load up to 100,000 bars, but only about 3,000 1 minule bars when
> trading.
>
> > I have 4GB (3 GB available in vista32) and
> > no other programs running... so is it best to use >1000 megabytes?
>
> I have a 2GB virtual XP32 running only AB. I use all default
settings.
>
> > What is number of bars to load (does db setting overwrite this?)?
>
> I override this in my AFL with SetBarsRequired()
>
> > DB settings has a 'flush cache' button. Doesn't seem to do
anything
> > for me. Does it work for you?
>
> It would just reload it again if it were flushed.
>
> > Refresh and refresh all has no
> > effect. If I do a refresh current sym, I get new data for that
sym
> > but then no further updates for any symbol.
>
> Refresh just forces AFL to run one cycle on the chart.
>
> I use RequestTimedRefresh() to make my chart refresh all the time
even
> if not quotes are coming in.
>
> > My db is 7400 1min bars*100 sym... are you working with a similar
> > size?
>
> Like I said, 300,000 5 second bars for just a few symbols.
>
> > BTW, I know what you mean about getting hypnotized so I get
alerted
> > to the quote delay with the following in the 1min chart - you can
> > probably get it to work with shorter periods or make it say
something:
> >
> > delayedcolor=IIf(TimeNum()<Now(4)-120 OR DateNum()<Now(3),32,16);
> > //for time at bar start-- 32=colorred, 16=colorblack , red if
> > last bar start-time is earlier than 1min20 sec of system time
> > //my bar times are at start of interval so min# could be 101
> >
> > Plot( C, "Close", delayedcolor, styleNoTitle | ParamStyle
("Style") |
> > GetPriceStyle() );
>
> Assuming that it is not the AFL that is stalled, I could write
> something that would monitor how long since the last quote came
in.
> However, in my case, I suspect that the AFL may not be running any
> passes when my charts freeze.
>
> OTOH, I could have another chart running in another tab which just
> pings messages to the main chart through a static variable to make
> sure it is alive, and alert me if it has stalled. Thanks for
jogging
> that Idea.
>
> Best regards,
> Dennis
>
>
> > Thanks, Dan
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, Dennis Brown <see3d@> wrote:
> >>
> >> Hello,
> >>
> >> I have something that happens once every few days with my RT
charts.
> >>
> >> At some point in the day, the chart stops updating. I also have
> >> getRTData() functions in my AFL that also stop.
> >>
> >> I don't know if it is the data feed that stops handing the quotes
> > to
> >> AB, or if XP is not giving the data, or if the AFL loop stops
> >> running. Everything looks normal, but I notice that my broker's
> >> charts have moved ahead and my AB charts have stalled (My
broker's
> >> charts are prone to stalling in fast markets and my AB charts
keep
> > on
> >> ticking). This can be disconcerting when you are in a fast trade
> > and
> >> you go blind without realizing it.
> >>
> >> I am using DTN IQFeed, but the same thing happened with eSignal
in
> >> previous years. The data feed plug-in indicates everything is
> > green
> >> and working.
> >>
> >> Clicking on the chart refresh button starts the chart running
again.
> >>
> >> I am usually in a panic when this happens, so I have not been
able
> > to
> >> properly go through debug steps to isolate the problem area.
> >>
> >> So my questions are:
> >>
> >> 1. Does anyone know the root cause of this?
> >> 2. Is there a way to detect that the chart has stopped updating
> >> (other than by eye)?
> >> 3. Is there a way to automatically jump start the updating again
> > when
> >> it happens?
> >>
> >> Thanks for any insights.
> >>
> >> If nobody can help, I will ask support.
> >>
> >> Best regards,
> >> Dennis
> >>
> >
> >
> >
> > ------------------------------------
> >
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> >
> > To get support from AmiBroker please send an e-mail directly to
> > SUPPORT {at} amibroker.com
> >
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> >
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> >
> >
> >
>
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