TJ, I've been following this thread and experimenting with memory usage and noticed something I don't understand: With and IQ 1 min database and 500k bars (just an experiment) and > 500 tickers. I started a scan with wait for backfill and noticed the memory usage via Task Manager was increasing. I minimized AB and the memory usage immediately dropped t0 around 16 meg. Also I let it run minimized and the memory started increasing and then I restored it and minimized it again and it dropped right back to 16 meg. What's going on?
d On Sat, Dec 6, 2008 at 6:25 AM, sidhartha70 <[EMAIL PROTECTED]> 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 [email protected], "Tomasz Janeczko" <[EMAIL PROTECTED]> 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" <[EMAIL PROTECTED]> > > To: <[email protected]> > > 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 [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 > > > >
