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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 amibroker@xxxxxxxxxxxxxxx, "monitorit" <monitorit@xxx> 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
>
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