QT definitely has inferior performance due to their limited bandwidth ... of course it's free. Switching to iqfeed improved performance greatly, so it is clearly much better th QT. I have really not streesed it very much, but I have not noticed anything detrimental in what I do.
A ----- Original Message ----- From: "przemyslawuk" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Sunday, December 07, 2008 3:35 PM Subject: [amibroker] Re: delays on iqfeed? > Hi, > I have exactly the same problem. I t very frustrating to watch my > charts moving, updating for 3 minutes after market close !!! > And it is with 4 symbols only. > I don't think the delay is AB fault (although I get a lot of problems > with real time data feed which are definitively AB problems). > I had IQfeed subscription to AB data feed and because of that delay > I decided to switch to QuoteTracker data feed from IQFeed and I still > get that delay, even with only one symbol streaming. > You can try it yourself, QT is free and will work with AB data feed. > Add one symbol to the portfolio and at the end of the day you will get > that delay. In my case it actually works well until lunch and then the > delay starts increasing. > > I was bombarding IQFeed with emails but they obviously say it is AB > or my internet connection. I tryied with 3 different internet links > and still the same problems. So it is IQFeed. > It was working fine before this volatility came to the markets and > whats irritating is that the problem doesn't go away on the "quiet" > days now. > > > --- In [email protected], "sidhartha70" <[EMAIL PROTECTED]> wrote: >> >> TJ is. Why? >> >> --- In [email protected], "gsmservplus" <domantas.rudys@> >> wrote: >> > >> > who is developing IQFeeD plugin for AB? >> > >> > --- In [email protected], "Tomasz Janeczko" <groups@> >> > wrote: >> > > >> > > You can also backfill after market close. And no, it is not AB >> > fault or bug. >> > > AmiBroker just displays what it receives from data source. >> > > Data quality is solely dependent on data vendor. >> > > >> > > Best regards, >> > > Tomasz Janeczko >> > > amibroker.com >> > > ----- Original Message ----- >> > > From: "gsmservplus" <domantas.rudys@> >> > > To: <[email protected]> >> > > Sent: Sunday, December 07, 2008 3:14 PM >> > > Subject: [amibroker] Re: delays on iqfeed? >> > > >> > > >> > > > >> > > > tomasz, >> > > > >> > > > not everybody can do backfill before market open.i switch on my >> > pc at >> > > > 12 ET and i`ve got 200 ticker in my database. so, is it only >> > chance >> > > > to solve this problem to do like you said? >> > > > and one more question.is it AB fault? because IQfeed cust serv >> > said >> > > > is everything alright from they side. >> > > > any chance to fix it in the future if its AB bug?because it is >> > > > nightmare, i f***d my database last thursday doing backfill like >> > you >> > > > said through AA explore and wait for backfill ticked,but at 12 >> > > > ET.half of my database was with a wrong data.and even when i try >> > to >> > > > backfill it today wrong data stays.only "force to backfill" could >> > > > help me.lost half a day to fix my database. >> > > > thanks for your time >> > > > >> > > > >> > > > >> > > > >> > > > >> > > > --- In [email protected], "Tomasz Janeczko" <groups@> >> > > > wrote: >> > > >> >> > > >> Hello, >> > > >> >> > > >> It was discussed in the past. Correct procedure with IQFeed is >> > > >> to start before market open, run single scan with "wait for >> > > > backfill" >> > > >> turned on. Do this BEFORE market open so IQFeed works faster. >> > > >> >> > > >> Once all symbols are backfilled and up-to-date you can turn this >> > > >> check box off and all symbols would stream and kept up-to-date. >> > > >> >> > > >> Please keep in mind that depending on symbols you use there can >> > > >> be few hundreds of ticks per second per symbol to be processed, >> > > >> so if you are tracking say 500 symbols, on high-activity periods >> > > >> (such as market open) you can receive as many as 50000 updates >> > per >> > > > second. >> > > >> Each update is about 100 bytes, so to transfer such amount of >> > data >> > > >> you need 50000*100 BYTES per second and that is about 50 Mbps, >> > > >> so 3Mbps internet connection is not enough to keep up with such >> > a >> > > > stream. >> > > >> (remember that connection speeds are expressed in BITS per >> > second, >> > > >> not bytes, and it takes 8 BITS to transfer one byte). >> > > >> >> > > >> Best regards, >> > > >> Tomasz Janeczko >> > > >> amibroker.com >> > > >> ----- Original Message ----- >> > > >> From: "gsmservplus" <domantas.rudys@> >> > > >> To: <[email protected]> >> > > >> Sent: Saturday, December 06, 2008 12:09 AM >> > > >> Subject: [amibroker] Re: delays on iqfeed? >> > > >> >> > > >> >> > > >> > could we expect any comments about this problem from Tomazs >> > > > Janeczko? >> > > >> > thanks >> > > >> > >> > > >> > --- In [email protected], "claudecaruana" >> > > > <claudecaruana@> >> > > >> > wrote: >> > > >> >> >> > > >> >> Hi, >> > > >> >> >> > > >> >> I too experienced the same 2 problems. >> > > >> >> >> > > >> >> As regards to the backfill problem, I resolved it by >> > backfilling >> > > >> >> through the AA window first, as opposed to manually pacing >> > > > through >> > > >> > the >> > > >> >> symbols: I run a simple exploration with "wait for backfill" >> > > >> > switched >> > > >> >> on, on all quotations. Once this is done all quotes are >> > updated >> > > > and >> > > >> >> streaming. >> > > >> >> >> > > >> >> I have not yet found a solution for the IQFeed delay. All I >> > can >> > > > say >> > > >> > is >> > > >> >> that it appears when there are a considerable number of >> > streaming >> > > >> >> symbols - if I have 5-10 symbols only which are streaming >> > then >> > > > the >> > > >> >> data is fine, but if I run the backfill on all my database >> > > > (approx >> > > >> > 450 >> > > >> >> symbols) then I am also experiencing a huge delay. >> > > >> >> >> > > >> >> I do not think this delay is due to the connection speed - I >> > am >> > > >> >> currently putting it down to the processing speed of my PC >> > and am >> > > >> >> looking to upgrade, but I am not sure this will resolve the >> > > > problem. >> > > >> >> >> > > >> >> I currently work around this by only subscribing to the >> > symbols >> > > > I >> > > >> > will >> > > >> >> be using for the day (by running the above routine I >> > mentioned >> > > > only >> > > >> > on >> > > >> >> a watchlist), then I update all the other symbols at the end >> > of >> > > > the >> > > >> >> day in order to stay updated from a historical perspective. >> > > >> >> >> > > >> >> hope this helps. Let me know if you find out something else >> > > > about >> > > >> > the >> > > >> >> IQFeed delay :) >> > > >> >> >> > > >> >> claude >> > > >> >> >> > > >> >> >> > > >> >> --- In [email protected], "gsmservplus" >> > <domantas.rudys@> >> > > >> >> wrote: >> > > >> >> > >> > > >> >> > hello, >> > > >> >> > >> > > >> >> > AB 5.20,windows vista,iqfeed client 4.4.0.3,virgin uk >> > > > broadband >> > > >> >> > internet provider with up to 3 Mb speed. >> > > >> >> > >> > > >> >> > my problem is: when i load my iqfeed data base after some >> > time >> > > > i >> > > >> > get >> > > >> >> > time delays on my stocks, forex ant futures RT data compare >> > > > with >> > > >> > my >> > > >> >> > PC time.every time delays are different from couple secs to >> > > > over >> > > >> > the >> > > >> >> > minute.as longer i`ve got AB and IQfeed opened as bigger >> > delay >> > > >> > is.but >> > > >> >> > it happens not always,but very often.IQfeed said is >> > everything >> > > >> >> > alright with my data and could be problem with software or >> > ISP. >> > > >> >> > p.s. time difference between IB TWS and my PC time is only >> > > > couple >> > > >> > (1-3 >> > > >> >> > sec.)seconds and never changes. >> > > >> >> > >> > > >> >> > >> > > >> >> > another problem is: when i start AB and start go through my >> > > >> > tickers >> > > >> >> > to backfill current day data(as i understand it can >> > backfill >> > > > only >> > > >> > 5 >> > > >> >> > tickers at the time, so every time when i start AB i`ve got >> > to >> > > > go >> > > >> >> > through all my database,i have around 200 tickers database) >> > > >> > sometimes >> > > >> >> > some tiskers gives wrong data, i mean, only one very long >> > > > candle >> > > >> > for >> > > >> >> > current with huge volume in hourly chart.after i >> > start "force >> > > >> >> > backfill"for those wrong ticker it gives right data >> > then.and >> > > >> > again it >> > > >> >> > happens not always, but very often. and IQ feed >> > cust.service >> > > >> > told me >> > > >> >> > could be problem with AB. >> > > >> >> > >> > > >> >> > any ideas about those two problems? thanks >> > > >> >> > >> > > >> >> >> > > >> > >> > > >> > >> > > >> > >> > > >> > ------------------------------------ >> > > >> > >> > > >> > **** 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 > > ********************************* > Yahoo! Groups Links > > >
