try using get1DJavaArray() instead of copyTo1DJavaArray(). This will avoid the
copy if its already a float and in order, which should be the common case for
grib.
Jeff McWhirter wrote:
I have traced some code reading in a big 3D grid. The first column
below shows elapsed time since last call,
second column shows memory delta snce last call. The >...< are nested
code blocks, showing the elapsed time.
This chunk of code takes 5.2 seconds. Note, 1.5 seconds is just in the
toFloatArray code, converting the
ArrayFloat.D3 to a 1D float array.
Can we optimize this so the initial Array is of a form that eliminates
this conversion?
Perhaps we could pass in preference that tells the geogrid that the
client will be asking
for 1D float data?
-Jeff
105 68 >GeoGridAdapter.getFlatField:Relative_humidity:time=2
1 2 >GeoGridAdapter.getSpatialDomainSet
0 2 GeoGridAdapter isTimeDependent = false
1 1 <GeoGridAdapter.getSpatialDomainSet ms: 1
1 1 >GeoGridAdapter.geogrid.readVolumeData
3710 18834 <GeoGridAdapter.geogrid.readVolumeData ms: 3710
0 2 >toFloatArray array:ucar.ma2.ArrayFloat$D3
0 1 >Array.copyTo1DJavaArray copy
1 1 >Array.copyTo1DJavaArray factory
1066 376 <Array.copyTo1DJavaArray factory ms: 1066
1 1 >MAMAth.copy
3 1 >MAMath.iterate
441 2 <MAMath.iterate ms: 440 cnt=6569800
1 1 <MAMAth.copy ms: 445
0 1 <Array.copyTo1DJavaArray copy ms: 1512
0 2 >Array.copyTo1DJavaArray getStorage
0 1 <Array.copyTo1DJavaArray getStorage ms: 0
1 2 <toFloatArray ms: 1514 length:6569800
0 11 <GeoGridAdapter.getFlatField:Relative_humidity:time=2 ms: 5226
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