Long Execution Times / Large WorkSpace Size

Hi,

I am having trouble with very long plot times. It is a large (~200,000
data points), and sometimes noisy, data set. An example is at

http://rasp.inn.leedsmet.ac.uk/RASPtableGM8/RASPtableGM.html?date=20120720&param=wstar&time=1300&zoom=7&centre=52.555029,-0.613068

This took NCL >15 mins to plot.

I have found that RasterFill (rather than the default AreaFill) can
dramatically speed things up for a contour plot, but I have not (yet)
applied this to all parameters.

I have also had a fatal Workspace Exceeded message. The machine has a
reasonable amount of memory (18 GiB).

It would seem from
http://www.ncl.ucar.edu/Document/Graphics/Resources/ws.shtml

that as soon as the total workspace exceeds wsThresholdSize (Default:
4194304 Bytes) the program "goes into swap", with obviously a massive
penalty on runtime. Does this mean that increasing this value will defer
this problem?

Clearly, it is advantageous to delete variables that are no longer
required: could you confirm that when a variable goes out of scope on
return from a function or procedure it is automatically deleted?

Thanks in advance for any pointers you can offer.

Regards

PaulS

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Received on Fri Jul 20 08:21:02 2012