From: Padhu
To: [email protected]
Sent: Monday, April 06, 2009 8:42 PM
Subject: Re: [amibroker] Re: erratic eSignal backfill- Did anyone get this
working?
I see same issues with AB 5.2 with esignal plugin just freezing during AA
RT scan...Number of symbols in watchlist is 230 and esignal max symbols is
200...BUT AB i think internally handles
how many symbols are fetched at one time during backfill....still it
hangs...only way is to close and restart AB untill next time...
If anyone has found a fix , pls let me know. I am also looking to prune the
symbols down to 175 to see if the problem goes away.
----- Original Message -----
From: Herman
To: brian_z111
Sent: Friday, December 12, 2008 8:16 AM
Subject: Re: [amibroker] Re: erratic eSignal backfill
Thanks Brian, for testing.
I am confused by it but not too worried. I backfill my eSignal DB of
2000+ symbols (at 90000 bars each about a 2.5 GByte DB) about once a week. I
never timed it but it may take from 30-60 minutes. I can live with this
once-a-week problem :-) This is my development DB. I don't need the eSignal DB
for trading, IB is OK for that.
I never had a warning from eSignal regarding exceeding my limit. This
only happens during RT scanning.
herman
Friday, December 12, 2008, 8:01:16 AM, you wrote:
> Herman,
> I'm still thinking about this one ... it would be nice to know the
> cause before trying to work around it.
> I did two tests today:
> - 600 symbols (S&P500 plus a few) ... 3000 * 1 min bars == 6 days ==
> 93kb per bar ... downloaded all OK .... eS DataManager popped up a
> warning at approx 30/60/90% of download == every 200 symbols ... I
> clicked OK and the download sailed on .... it would have kept going
> even if I hadn't acknowledged the popup.
> - 500 symbols (S&P) ... 100,000 * 1 min bars == 208 days == 3125KB
> per bar == way over the max possible bakfill (approx 6 months for 1
> min bars) ... download locked up after only 4% == approx 20
> symbols ... this is way below the cumulative byte for 200 symbols *
> backfill limit .... no warning about exceeding symbol limit.
> I am not sure about what the cause is ... eS fault, AB plugin fault
> OR throttling by eS OR something else.
> brian_z
> --- In [email protected], "brian_z111" <brian_z...@...> wrote:
>> I use eS - I am not a heavy user or particularly knowledgeable.
>> I have also had this occur.
>> I concluded it was because I was exceeding my symbol limit.... I
> was a
>> bit surprised about this.
>> eS allow unlimited symbols, theoretically, but only x number at a
> time
>> (I have the base 200).
>> I expected to be able to backfill (exploration) with an unlimited
> no.
>> of symbopls because it is not using them simultaneously (streaming)
> as
>> per the quote window ..... the AB manual says that the AB plugin
>> rotates a symbol out of the list as it is filled and enters the
> next
>> one .... logically I assume the plugin can present the request to
> eS
>> servers one symbol at a time so why should it lock up on excess
> symbols?
>> Anyway, it does.
>> I didn't reach a conclusion whether the AB plugin wasn't doing what
> the
>> manual said it would or if I was misunderstanding something.
>> I think eS is cutting off the download.
>> The only solution I found was to batch the download via watchlists
> (as
>> per D's suggestion) ... I do manually turn off the plugin after
> each
>> batch ... not sure if I need to .... instinct told me to do that
> and I
>> didn't push it because of the effort required.
>> Perhaps you could check with AB support if the symbol rotation
> feature
>> was/is/should be working OR has that been discontinued for some
> reason.
>> I believe it would work if you find a way to auto start AB and
> batch
>> explore etc
>> brian_z
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