Why is backtesting redownloading all my data?

[NinjaTrader_JoshP]

Is this a multi-instrument strategy? Please try to reproduce with SampleMACrossOver.

[cunparis]

Is this a multi-instrument strategy? Please try to reproduce with SampleMACrossOver.

I'll try with that one.

In the mean time, I just made a new strategy. Multi-timeframe but 1 instrument (QM). I ran it and the first time it was quick, so I run it again and it's been hanging there since 03 and it's now 10 so that's 7 minutes to recover data that I already have, data that was recovered in a few minutes just a few minutes ago.

I don't see why Ninjatrader is asking IQFeed for the data. If IQFeed is slow it wouldn't surprise me, but it shouldn't be in the loop at this point. I'll try with the Sample strategy tomorrow...

2008-10-30 21:59:15:953 WARNING: Starting Strategy
2008-10-30 21:59:18:857 (IQ Delta) Data.Bars.GetBarsNow: instrument='QM ##-##' from='2005-10-11' to='2008-10-29' sessionBegin='00:00:00' sessionEnd='00:00:00' excludeWeekend=False period=Daily splitAdjusted=False dividendAdjusted=False bars=0
2008-10-30 21:59:38:396 (IQ Delta) Data.Bars.GetBarsNow: instrument='QM ##-##' from='2005-10-11' to='2008-10-29' sessionBegin='00:00:00' sessionEnd='00:00:00' excludeWeekend=False period=1 Min splitAdjusted=False dividendAdjusted=False bars=0
2008-10-30 22:02:53:540 WARNING: Starting Strategy
2008-10-30 22:02:53:543 WARNING: Starting Strategy
2008-10-30 22:03:01:838 (IQ Delta) Data.Bars.GetBarsNow: instrument='QM ##-##' from='2005-10-11' to='2008-10-29' sessionBegin='00:00:00' sessionEnd='00:00:00' excludeWeekend=False period=1 Min splitAdjusted=False dividendAdjusted=False bars=0

[NinjaTrader_JoshP]

Ok. Let us know how it goes tomorrow. Thanks.

[cunparis]

Is this a multi-instrument strategy? Please try to reproduce with SampleMACrossOver.

Works fine.

I'll see if I can come up with a way to reproduce it. Something is causing NT to hang and it just gets stuck there. It seem to happen on certain symbols and not others.

[NinjaTrader_JoshP]

Ok. Thanks. Let us know when you can reproduce it.

[cunparis]

Ok. Thanks. Let us know when you can reproduce it.

I was having lots of problems so I did the reset instruments and now everything works just fine. In fact, tests that were taking several minutes now take several seconds.

[NinjaTrader_Ray]

Happy it's resolved and thanks for reporting back.

[cunparis]

Happy it's resolved and thanks for reporting back.

Hopefully if anyone else starts experience a slow down in performance, they will stumble upon this thread and reset their instrument list.

Seriously, these forums are what sets Ninjatrader apart from the competition. It was *the* deciding factor for me. Who can beat free great support on saturdays!

[Owlman]

Similar problem

Hi,

I was having similar problems running backtests, I thought I was going to have to use a calendar to time them... Anyway, reset the instruments, restarted Ninja and retried the backtest, it finished in less than a minute. Then I changed one thing and reran the backtest. Instead of a one minute chart I changed it to a 144 tick chart. That was 15 minutes ago and it's still sitting there telling me the request cannot be aborted. In fact Ninja seems to have hung completely. I can't even Alt-Tab to any charts (currently connected to Zenfire).

Anything else I can try?

Thanks,
Ian

[cunparis]

Hi,

I was having similar problems running backtests, I thought I was going to have to use a calendar to time them... Anyway, reset the instruments, restarted Ninja and retried the backtest, it finished in less than a minute.

Resetting fixed a slowing down problem for me once but now I've added several indexes which are not in the default instrument list so I don't want to reset the list and have to re-enter all that.

[NinjaTrader_JoshP]

Owlman,

144 tick charts means for a very resource intensive data set. We recommend you either decrease the testing interval or try on a less intensive chart type. Also, please try to be on an as-strong-as-possible machine for backtesting.