Have you updated to the latest IQ Feed download client...? 4.6.0.7...? I have and have experienced no problems...
Users of the new IQ Feed download client have reported lower CPU loads and lower internet bandwidth saturation... Try it... see if it helps. --- In [email protected], "etoketrader" <et...@...> wrote: > > Hi Tomasz, > > Agreed on load imposed by the rapid update of 500 symbols. No question about > it. > > What I would like to understand is what elements (hardware, or system > optimisation) would help reduce the duration of a scan. > > Unfortunately running the 64bit version is out of the question because of the > realtime plugin issue. This rules out the possibility of adding a large > amount of RAM although I don't know whether that alone would help. > > Are there any other ways I might be able to increase the speed? Would copying > the entire db on several GB of a RAM disk before a market session be worth > trying? > > Best regards, > eToke > > > > > > --- In [email protected], "Tomasz Janeczko" <groups@> wrote: > > > > Hello, > > > > You need to understand that there can be even 800 ticks PER SECOND on one > > symbol > > If you are for example following 500 symbols, it presents the stream of > > 400000 updates per second. > > Even when processing took as little as 2 microseconds per update (1 > > millionth part of the second) > > this would mean 80% CPU utilisation. So yes, if there are lots of quotes > > streaming > > on lots of symbols you will see higher CPU usage and possible also slower > > exploration. > > > > Best regards, > > Tomasz Janeczko > > amibroker.com > > ----- Original Message ----- > > From: "etoketrader" <etoke@> > > To: <[email protected]> > > Sent: Tuesday, August 04, 2009 6:09 PM > > Subject: [amibroker] Re: Speeding exporation intraday > > > > > > > hi Tomasz, > > > > > > that makes sense. > > > > > > However in my case all my symbols are already active both on and off > > > market hours. > > > > > > When quotes are being updated constantly during market hours, a test > > > exploration code which displays the closing price takes > > > approx. 6 - 10 times the duration of when the quotes are also streaming > > > but outside of market hours (i.e. hardly any updates). > > > > > > My question is if there is anything I can do to speed this up. > > > > > > BR > > > > > > eToke > > > > > > > > > > > > --- In [email protected], "Tomasz Janeczko" <groups@> wrote: > > >> > > >> Hello, > > >> > > >> That depends if given symbol is in the "active" (i.e. streaming) list or > > >> not. > > >> If it is - then turning on/off "wait for backfill" does not make > > >> difference. > > >> > > >> If it is not, then with "wait for backfill" turned on it will of course > > >> wait for "missing" bars > > >> before proceeding to next symbol. > > >> > > >> Charts on the other hand, always refresh immediatelly with data that are > > >> present right now. > > >> If symbol is not present in the active list it is automatically added > > >> and backfill request > > >> may be sent but this does not block chart from refreshing - it will > > >> refresh immediatelly, > > >> and once backfill data eventually arrives it will refresh once more. > > >> In other words - charts are asynchronous with regards to backfill. AA > > >> can be synchronous > > >> ("wait for backfill" turned ON) or asynchronous ("wait for backfill" > > >> turned OFF). > > >> > > >> That's the only difference. AFL execution IS IDENTICAL regardless where > > >> it occurs. > > >> Of course with different zoom levels / different AA range you may be > > >> using different number of bars, > > >> but that should be obvious. > > >> > > >> Best regards, > > >> Tomasz Janeczko > > >> amibroker.com > > >> ----- Original Message ----- > > >> From: "sidhartha70" <sidhartha70@> > > >> To: <[email protected]> > > >> Sent: Tuesday, August 04, 2009 5:14 PM > > >> Subject: [amibroker] Re: Speeding exporation intraday > > >> > > >> > > >> > I'd be interested to hear TJ's answer on this eToke... > > >> > > > >> > Because I was asking from very similar questions of support & TJ > > >> > recently... namely that equivalent AFL on charts seems to > > >> > execute > > >> > much quicker than a scan or exploration. Which obviously leads one to > > >> > think that other operations that occur in a scan or > > >> > exploration, outside of the AFL execution, are what take the time... > > >> > > > >> > Why this time is greater with a streaming feed I don't know... > > >> > > > >> > --- In [email protected], "etoketrader" <etoke@> wrote: > > >> >> > > >> >> Hi, for testing I am currently running: > > >> >> > > >> >> n Last quotations = 1 > > >> >> A very basic AFL code which lists closing price. > > >> >> QuickAFL turned on > > >> >> > > >> >> I am concerned about the comparison between how it runs outside of > > >> >> market hours vs how it runs during. > > >> >> > > >> >> BR, > > >> >> eToke > > >> >> > > >> >> > > >> >> > > >> >> --- In [email protected], "sidhartha70" <sidhartha70@> wrote: > > >> >> > > > >> >> > How many quotations are you running the explorations over...? > > >> >> > > > >> >> > --- In [email protected], "etoketrader" <etoke@> wrote: > > >> >> > > > > >> >> > > Tried that. I always run the first backfill before market hours. > > >> >> > > After that, backfill setting does not seem to make any > > >> >> > > difference as long as everything has already been backfilled and > > >> >> > > all symbols are streaming. > > >> >> > > > > >> >> > > BR > > >> >> > > eToke > > >> >> > > > > >> >> > > > > >> >> > > --- In [email protected], "murthysuresh" <murthysuresh@> > > >> >> > > wrote: > > >> >> > > > > > >> >> > > > backfill before the start of the market hours. turn off > > >> >> > > > backfill as you only need to do it at the beginning of the > > >> >> > > > session. > > >> >> > > > > > >> >> > > > --- In [email protected], "etoketrader" <etoke@> wrote: > > >> >> > > > > > > >> >> > > > > Hi, > > >> >> > > > > > > >> >> > > > > I currently run IQFeed on 500 symbols. Exploration outside of > > >> >> > > > > market hours run under 1 minute but slow down to 6 > > >> >> > > > > minutes > > >> >> > > > > during market hours. > > >> >> > > > > > > >> >> > > > > Can anybody recommend some ideal settings to speed up > > >> >> > > > > intraday explorations while streaming? > > >> >> > > > > > > >> >> > > > > thanks, > > >> >> > > > > eToke > > >> >> > > > > > > >> >> > > > > > >> >> > > > > >> >> > > > >> >> > > >> > > > >> > > > >> > > > >> > > > >> > ------------------------------------ > > >> > > > >> > **** IMPORTANT PLEASE READ **** > > >> > This group is for the discussion between users only. > > >> > This is *NOT* technical support channel. > > >> > > > >> > TO GET TECHNICAL SUPPORT send an e-mail directly to > > >> > SUPPORT {at} amibroker.com > > >> > > > >> > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at > > >> > http://www.amibroker.com/feedback/ > > >> > (submissions sent via other channels won't be considered) > > >> > > > >> > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: > > >> > http://www.amibroker.com/devlog/ > > >> > > > >> > Yahoo! Groups Links > > >> > > > >> > > > >> > > > >> > > > > > > > > > > > > > > > ------------------------------------ > > > > > > **** IMPORTANT PLEASE READ **** > > > This group is for the discussion between users only. > > > This is *NOT* technical support channel. > > > > > > TO GET TECHNICAL SUPPORT send an e-mail directly to > > > SUPPORT {at} amibroker.com > > > > > > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at > > > http://www.amibroker.com/feedback/ > > > (submissions sent via other channels won't be considered) > > > > > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: > > > http://www.amibroker.com/devlog/ > > > > > > Yahoo! Groups Links > > > > > > > > > > > >
