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 [email protected], "Tomasz Janeczko" <[EMAIL PROTECTED]> 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" <[EMAIL PROTECTED]> > To: <[email protected]> > 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" <[EMAIL PROTECTED]> > > To: <[email protected]> > > 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 [email protected], "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 > > > > > > >
