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If there were 2 M bars specified in the database but only 1M bars
are stored in a particular ticker, Is the overhead involved in
loading this ticker the same as if 2M bars were stored?
/Paul.
--- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx>
wrote:
>
> For others experiencing same problem:
> the reason was over-the-roof number of bars specified in File-
>Database Settings.
> There were 2 MILLION bars entered in 1-minute database, which is
> 20x more than recommended setting of 100 000 bars.
>
> The IQFeed should be setup EXACTLY as shown in the video
> http://www.amibroker.com/video/IQFeed.html
>
> Specifying 20x more "number of bars" causes 20x more overhead and
> CPU cache misses because instead just using 3MB cache for one
symbol at 100k bars,
> 2 million bars it requires 62MB. This effectively means that your
on-chip
> CPU cache is flushed non-stop and that forces CPU to use much
slower (10x) RAM memory.
>
> Best regards,
> Tomasz Janeczko
> amibroker.com
> ----- Original Message -----
> From: "Tomasz Janeczko" <groups@xxx>
> To: <amibroker@xxxxxxxxxxxxxxx>
> Sent: Friday, December 05, 2008 11:56 PM
> Subject: Re: [amibroker] Re: Speed Issues
>
>
> > Hello,
> >
> > Indeed the times you get do not sum up.
> > On my rather low-end computer (dual core, 3 year old athlon)
using eSignal as a data source
> > and 8 charts displayed simultaneously and all visible, the total
display time is only 0.094 sec
> > and it is perfectly responsive.
> >
> > I guess that this has to do something with the database settings
> > you are using. Please send screenshots of your File->Database
> > settings to support.
> >
> > Best regards,
> > Tomasz Janeczko
> > amibroker.com
> > ----- Original Message -----
> > From: "sidhartha70" <sidhartha70@xxx>
> > To: <amibroker@xxxxxxxxxxxxxxx>
> > Sent: Friday, December 05, 2008 6:41 PM
> > Subject: [amibroker] Re: Speed Issues
> >
> >
> >> Addition to this post...
> >>
> >> I now have 4 charts opened with a simple price chart displayed
> >> (Dragged from 'Basic Charts'). Each chart is displayed
in 'sheet1' of
> >> the chart. No other 'sheets' contain anything at all. Each
chart is
> >> maximised (hence only one visible at a time) and accessable via
the
> >> MDI tabs.
> >> I have 4 intervals displayed... 1 min, 2 min, 3 min and 5 min.
> >> I use an IQ Feed DB. I'm using 8Gb ram and a 3Ghz octo core
processor.
> >>
> >> Each price chart has a total time of approx 0.0075 secs.
> >>
> >> The total redraw time for the four charts together is approx
0.45 secs.
> >>
> >> Again... this total redraw time seems both very high... and
makes no
> >> sense.
> >>
> >> Any total chart redraw times of this magnitude seem to make AB
quite
> >> unresponsive.
> >>
> >> Is anyone actually using AB for live trading using multiple
charts
> >> displayed...? If so, please tell me how and what I'm doing
wrong?
> >> Because right now, I can't seem to get the requisite speed for
that to
> >> be an enjoyable reality.
> >>
> >>
> >> --- 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
> >>>
> >>
> >>
> >>
> >> ------------------------------------
> >>
> >> **** 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:
> >> http://www.amibroker.com/devlog/
> >>
> >> For other support material please check also:
> >> http://www.amibroker.com/support.html
> >>
> >> *********************************
> >> Yahoo! Groups Links
> >>
> >>
> >>
> >
> > ------------------------------------
> >
> > **** 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:
> > http://www.amibroker.com/devlog/
> >
> > For other support material please check also:
> > http://www.amibroker.com/support.html
> >
> > *********************************
> > Yahoo! Groups Links
> >
> >
> >
>
------------------------------------
**** 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:
http://www.amibroker.com/devlog/
For other support material please check also:
http://www.amibroker.com/support.html
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