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[IDV #XKA-295690]: issue with color shaded plan view

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  • Subject: [IDV #XKA-295690]: issue with color shaded plan view
  • Date: Wed, 30 May 2012 16:19:58 -0600
> >
> > Ticket Details
> > ===================
> > Ticket ID: XKA-295690
> > Department: Support IDV
> > Priority: Normal
> > Status: Closed
> >
> One small query, every time create a new display control. unpackfloats
> with copy=true gets called up ignoring the value of
> arguement copy coming in in the following constructor as arguement:
> public CachedFlatField(CachedFlatField that, boolean copy,
> FunctionType type, Set domainSet,
> CoordinateSystem rangeCoordSys,
> CoordinateSystem[] rangeCoordSysArray,
> Set[] rangeSets, Unit[] units);
> 
> The partial stack trace is as follows:
> visad.data.CachedFlatField.<init>(CachedFlatField.java:171)
> visad.data.CachedFlatField.cloneMe(CachedFlatField.java:214)
> ucar.visad.Util.clone(Util.java:1228)
> ucar.unidata.data.grid.GridUtil.setParamType(GridUtil.java:3041)
> ucar.unidata.data.grid.GridDataInstance.setParamType(GridDataInstance.java:404)
> ucar.unidata.data.grid.GridDataInstance.getGrid(GridDataInstance.java:587)
> ucar.unidata.idv.control.DisplayControlImpl.getGrid(DisplayControlImpl.java:3448)
> ucar.unidata.idv.control.DisplayControlImpl.getGrid(DisplayControlImpl.java:3431)
> ucar.unidata.idv.control.PlanViewControl.loadDataAtLevel(PlanViewControl.java:1174)
> ucar.unidata.idv.control.PlanViewControl.loadDataAtLevel(PlanViewControl.java:1142)
> ucar.unidata.idv.control.PlanViewControl.setData(PlanViewControl.java:699)
> ucar.unidata.idv.control.ImagePlanViewControl.setData(ImagePlanViewControl.java:114
> 
> I mean to say a fresh new copy of flatfield gets created or atleast a
> fresh new copy of its range samples gets created
> in addition to the one created which is returned by getDataInner()
> function of the DataSource classes.
> As a result of this the memory spike goes for a high jump.
> A sample test run says that if I can display an 11.2 K x 11.2 K image in
> 1.3 GB of RAM, still it needs 1.7 GB of RAM only due to this.
> Although after GC, it stands at 800 MB RAM.
> It may a design decision but just out of curosity I wanted to know what
> is the reason behind this.
> thanks for listening to me patiently.

In many situations, the IDV need to create a copy when doing the calculation 
and set this parm to true. Do you really need a fresh copy? I am not surprise 
for the memory
spike if as you are dealing with large dataset.


Yuan 
> I am marking copy of this mail to Don Sir too as I discussed it with him
> too but he was a bit busy. May be he can also help us in
> understanding this.
> 
> regards
> Ghansham
> 
> 
> 
> 


Ticket Details
===================
Ticket ID: XKA-295690
Department: Support IDV
Priority: Normal
Status: Closed