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Monitorit,
I still trying to work out exactly what your issue is...? Is it speed
ultimately...? If so, I can tell you from my own experience 'symbol
linking' degrades performance of AB very significantly. I had to turn
symbol linking off...
--- In amibroker@xxxxxxxxxxxxxxx, "monitorit" <monitorit@xxx> wrote:
>
> 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@> 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
> > >>
> > >
> > >
> > >
> > > ------------------------------------
> > >
> > > Please note that this group is for discussion between users only.
> > >
> > > To get support from AmiBroker please send an e-mail directly to
> > > SUPPORT {at} amibroker.com
> > >
> > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> > > http://www.amibroker.com/devlog/
> > >
> > > For other support material please check also:
> > > http://www.amibroker.com/support.html
> > > Yahoo! Groups Links
> > >
> > >
> > >
> >
>
------------------------------------
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