memory leak when using png driver?

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NCL users,

I have code that loops through a file to create a set of maps for a
year. I open the file and get the variable plotted before the loop to
plot the maps.

e.g.

read data

do loop though days
  wks_type = "png"
  rez=2560
  output="png"
  temp = pr_wtr(day,:,:)
  wks = gsn_open_wks(output,name) ; open a png file
  gsn_define_colormap(wks,"prwtr") ; choose colormap
  ...set plot parameters...
  plot=gsn_csm_contour_map_ce(wks,temp,res)

end do

The problem is that the code isn't releasing memory and it starts taking
over all the memory in the machine (30G!). Is there a way to release the
memory? Or, do I likely have an error somewhere? We are using NCL 5.1.1
on a 64 bit Linux redhat machine (V 2.6.18-164.6.1.el5)

Thanks
Cathy Smith

(short code that produces error)

;************************************************
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"

;************************************************
begin

;************************************************
; read in netCDF file
;************************************************
  a = addfile("/Datasets/20thC_ReanV2/monolevel/pr_wtr.eatm.1902.nc","r")
  pr_wtr = short2flt( a->pr_wtr )

 do id=0,364*4
 nd=id+1
 temp = pr_wtr(id,:,:)
name1=sprinti("%4.4i", nd)
 name="/scratch60d/csmith/20th/prcpx." + name1
print(name)
 rez=2560
 output="png"
 output@wkWidth = rez ; must be square; deviations
 output@wkHeight = rez ; either way are wasted
  wks = gsn_open_wks(output,name) ; open a png file
  gsn_define_colormap(wks,"prwtr") ; choose colormap

  res = True
  res@cnFillOn = True ; turn on color fill
  res@gsnSpreadColors = True ; use full range of color map
res@mpMinLonF=0
res@mpMaxLonF=360
res@gsnAddCyclic=True
res@mpMinLatF = -90
res@mpMaxLatF = 90

  plot=gsn_csm_contour_map_ce(wks,temp,res) ; now draw as
one plot

  end do
end

)

- --
NOAA/ESRL PSD and CIRES CDC
303-497-6263
http://www.esrl.noaa.gov/psd/people/cathy.smith/
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Received on Fri Feb 5 16:23:17 2010