diff between onbarupdate and onmarket update

[junkone]

from a strategy coding perspective, what is the diff between on market update and on barupdate. why is there 2 options. which should be used for what reason.

[NinjaTrader_Bertrand]

Hi junkone,

The OnBarUpdate() is called for every bar's update - http://www.ninjatrader-support.com/H...dateEvent.html

This takes into account the CalculateOnBarClose setting - http://www.ninjatrader-support.com/H...BarClose1.html

When set to false, the OnBarUpdate() is called for every incoming tick.

The OnMarketData() is called for every change in Level1 data, for example Bid/Ask/Last/Volume - http://www.ninjatrader-support.com/H...arketData.html

OnMarketDepth would be used for Level2 data changes - http://www.ninjatrader-support.com/H...rketDepth.html

[junkone]

what defines tick in terms of IB as datasoruce. is it every bid/ask or is it the 5 sec update that IB sends.
the reason, i am very curious is that, my strategy subscribes to custom events. i can trace the processing to the event handler and it seems to process it. however further processing is not happening and the only bottle neck that i can see is that the strategy did not get a new barupdate tick and was waiting for it to come. i have seen it wait for the tick for as much as 20 seconds.

[NinjaTrader_Bertrand]

Hi junkone, tick is whatever update your datasource gives you, so for example if you run it on CalculateOnBarClose = false you could have an idle time because no fresh tick has come in that would have triggerd your OnBarUpdate(). Have you debugged your strategy with Print() statements?

[junkone]

what is the tick update frequency for IB.
my barupdate runs only on tick updates. the only issue is that randomly its seems to be very delayed

[NinjaTrader_Bertrand]

For the last in the OnBarUpdate() I think it would be the snapshot, so you could try accessing bid / ask changes in the OnMarketData(). How do you determine the tick arrives delayed in those instances?

[junkone]

i can track my event till the point where it is calling onbarupdate. basically, i have a print events passed to the chart functiolaity within the onbarupdate. i dont see those refreshes on a consistent interval.

[NinjaTrader_Bertrand]

There is no constant tick refresh / update, this will depend on the current market - have you tried another datasource to compare?