XY dot plot slows down over time

In my VI I am using Express XY graph to plot a continous stream of XY coordinates over a contstant domain and range. I would like to keep the trail of these points.
Initially, plotting is very fast. But it eventually slows down to a crawl as point keep coming in. I have disabled autoscaling and smooth updates, but still the same problem.
Is there any solution to this, other than periodically reseting the graph?

Hello Amir,
I�m assuming that your data is being streamed into an array, and that you are then plotting that array on the XY graph. If this is the case, the XY graph has to rewrite itself every time, since XY graphs are a one-shot display. They are not set up for streaming. As your data keeps streaming in, the array gets bigger and bigger, causing the XY graph to take longer to refresh, slowing everything down.
One solution is to only plot the last x number of data points (x based on how fast you want it to refresh vs how much data you want to see). I�m including an example of a circular buffer than does just this. You�ll have to modify it for your data and for the XY graph, but the idea is the same.
If none of these suggestions help, please
post the software and versions you are using, the applicable portions of your code, and any other information that may help, and I�ll be happy to look further into it.
Have a nice day!
Robert Mortensen
Software Engineer
National Instruments
Attachments:
CircularBuffer.vi ‏29 KB

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              >> 2 weeks or even twice a week.
              >>
              >>
              >> Tom Barnes <pleasereplyinnewsgroup.weblogic.developer.interest.jms@newsgrou
              >>
              >> ps.bea.com> wrote:
              >>
              >>>Hi Kevin,
              >>>
              >>>Is the number of messages in the destination higher at
              >>>these times?
              >>>
              >>>If there is "very little activity" how can you
              >>>measure a slowdown?
              >>>
              >>>Can you force server side thread-dumps the next
              >>>time this occurs?
              >>>
              >>>Tom
              >>>
              >>>Kevin Sharfman wrote:
              >>>
              >>>
              >>>>Hi,
              >>>>
              >>>>Our system makes use of queues extensively. We, pumps trhough tens
              >>>
              >>>of thousands
              >>>
              >>>>of messages every day . Every few days, our Weblogic 7 SP5 JMS queue
              >>>
              >>>slows down
              >>>
              >>>>with very little activity. After restarting the instance, everything
              >>>
              >>>goes back
              >>>
              >>>>to normal. We have about 14 queues in our system with a very high
              >rate
              >>>
              >>>of throughput.
              >>>
              >>>>Any ideas as to what slows down the queue requiring a restart.
              >>>>
              >>>>The JMS file store is excluded from anti-virus and backup software.
              >>>>
              >>>>Kevin
              >>>
              >>
              >
              

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