Guess I shoulda known that ... Thanks for the link.
d On Sat, Dec 6, 2008 at 1:45 PM, Tomasz Janeczko <[EMAIL PROTECTED]>wrote: > That is normal Windows behaviour: > http://support.microsoft.com/kb/293215 > > You are not looking at "memory usage" but rather at so called "working > set". > It is built-in Windows strategy to trim application working set when its > top-level window is minimized. > That occurs with EVERY application run on Windows. > > Best regards, > Tomasz Janeczko > amibroker.com > > ----- Original Message ----- > *From:* dingo <[EMAIL PROTECTED]> > *To:* [email protected] > *Sent:* Saturday, December 06, 2008 6:24 PM > *Subject:* Re: [amibroker] Re: Speed Issues > > 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 >> >> >> >> > >
