Re: [amibroker] Re: Speed Issues, AmiBroker Email List Archive

On Sat, Dec 6, 2008 at 6:25 AM, sidhartha70 <sidhartha70@xxxxxxxxx> wrote:

TJ,

Thanks for your assitance here.
As I explained the reason I made the number so large was to make sure
I captured ALL of IQ Feed's 1 Min data AND daily data. I accept that I
could have made the number 1mil instead of 2mil and achieved the same
objective. However, for purposes of longer term intraday backtesting,
I see no alternative other than to change the registry setting and
load more bars than recommeneded.

Anyway, this is all a learning process. Because most of us don't
understand how AB manages data as intimately as you, we are not aware
of how a larger DB critically effects performance (due to CPU cache
being overloaded). Perhaps it's worth spelling this out a little more
detail so that we are all 'in the know'.

I have now decided to have one large DB for longer term backtesting
where live performance is not critical... and a much lighter weight,
smaller DB for live trading.

Thanks again.

--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx> wrote:
>

> The original poster ignored recommended settings, ignored
> warnings displayed by AmiBroker, used registry hack to
> disable 500k bar limit and entered 20x more than recommended
> "number of bars" for 1-minute IQFeed database (2 million bars
instead recommended 100k)
>
> If you load 40 tonnes onto Ferrari it won't go. And that's no surprise.
>
> Always, I mean ALWAYS use recommended settings (as presented in
tutorials
> and videos) and it will work perfectly.
>
> As with any machine, any equipment, etc, if you load 20x more than
manufacturer recommends
> you can expect it to run at least 20x slower or not run at all.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----

> From: "monitorit" <monitorit@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Saturday, December 06, 2008 3:34 AM
> Subject: [amibroker] Re: Speed Issues
>
>
> > Hi
> > May I ask how many tickers are being continuously updated during live
> > market hours? This would include the number of tickers that were
> > exposed to an AA or were displayed on a chart since the current
> > session of AB started + any additional tickers displayed in the
> > realtime quote window (at least in my experience and with another
> > data provider). Do you notice any problem after market hours when
> > all the data is already local?
> > I've given up trying to keep >30+ tickers live
> > (with some days better than others.. ? d/t velocity of market
> > activity or something else between AB -the internet - and my
> > provider) but don't see a problem with chart redraws just the data
> > update gets delayed. Even when I switch to a different ticker -
> > redraw is quick - but the last bar can be several minutes old on a 1
> > min chart.
> >
> > Dan
> >
> >
> > --- In amibroker@xxxxxxxxxxxxxxx, "sidhartha70" <sidhartha70@>
> > wrote:
> >>
> >> Hi All,
> >>
> >> Just when I think I seem to have got to the bottom of speed issues
> > for
> >> live trading with AmiBroker... I find myself needing a little more
> > advice.
> >>
> >> I have 4 charts... each chart has a total chart timing of about
> > 0.045
> >> secs.
> >>
> >> However, the 4 charts in total, have a total redraw time of between
> >> 0.5 - 0.65 secs.
> >>
> >> Does this sound reasonable...?? Not quite sure how we get 0.5 from
> >> 0.045 * 4....? If not, any ideas where the extra redraw time is
> > coming
> >> from...?
> >>
> >> Second... I'm finding AB, again, very difficult to use for live
> >> trading with this kind of redraw speed. What can I do to make it
> >> faster...?? Any ideas....? (for reference ALL charts have the
> >> following line at the end of their code, SetBarsRequired( 1000,
> > 200 );)
> >>
> >> TIA
> >>
> >
> >
> >
> > ------------------------------------
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> >
> >
> >
>

------------------------------------

**** IMPORTANT ****
This group is for the discussion between users only.
This is *NOT* technical support channel.

*********************
TO GET TECHNICAL SUPPORT from AmiBroker please send an e-mail directly to
SUPPORT {at} amibroker.com
*********************

For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
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