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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@xxx> 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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