Hi again, My observations confirm what monitorit says. Doing the calculations from other end- database settings : 1min/1100bars/34kb per symbol. Backfill of 60 symbols took me 47min (before the market open and I was not runing AB the day before).
60symbols * 34kb per symbol -> ~2Mb during 47min -> gives avarege backfill transfer of 0.7kb/s !!!!!!!!!!!!!!!!!! WHERE IS THE BOTTLENECK? Obviously streaming large number of symbols and runing scans whole day with a 0.7kb/s transfer has to cause delays. And I noticed that if I only use Quotetracker the delay is not that large. If I can download files from internet at 500kb/s the backfill should have similar transfer rate. Can other users of AB confirm the numbers I get by running similar test on their database? --- In [email protected], "monitorit" <[EMAIL PROTECTED]> wrote: > > Tomasz, I use qpFeed not IQfeed but have had a problem forever that > is somewhat the same. There is NO problem when just updating a few > symbols continuously-but- if I try to keep about 75-100 symbols > updating, the quotes come in slower and slower. The people at the > quote provider say they get no complaints and there is no problems > sending out the quotes. Can you try to set up a 1 minute db with > about 100 tickers, the layout has 5 windows all symbol-linked (1min, > 2min, 5min, 15min and daily). Use any simple indicator with the > price (ie 10 bar MA). Run any simple AA to cause all 100 tickers to > update. Then see how long the symbols take to get up to date and > more important, come back a few hours later and see the time of the > last bar compared to the time on your clock.. has it fallen behind? > You can just leave the original symbol displayed- no need to change > symbols after the first change after running the AA. I know we have > discussed this before- but I wonder if you have done my little > experiment yourself? > Thanks again and I remain convinced AB is the best by far. > Dan >
