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Re: THREDDS and grib
- To: Kevin O'Brien <Kevin.M.O'Brien@xxxxxxxx>
- Subject: Re: THREDDS and grib
- From: John Caron <caron@xxxxxxxxxxxxxxxx>
- Date: Thu, 24 Apr 2008 09:36:16 -0600
- Cc: Unidata netCDF Java Support <support-netcdf-java@xxxxxxxxxxxxxxxx>, Ethan Davis <edavis@xxxxxxxxxxxxxxxx>
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- In-reply-to: <480E5985.4010200@noaa.gov>
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Hi Kevin:
I havent had time to reproduce this yet, but im guessing one source of the
slowdown is using opendap
URLS in the compound aggregation. It would be interesting to time 1) the single
aggregations, 2) the
compound agg as it exists, and 3) the compound agg, but replace the opendap
URLs with direct netcdf
files,
see attached file
Replace:
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
<aggregation type="union">
<netcdf
location="http://data1.gfdl.noaa.gov:8780/thredds/dodsC/pr_daily_20C3M-1_R1_18610101-20001231";
/>
<netcdf
location="http://data1.gfdl.noaa.gov:8780/thredds/dodsC/tasmax_daily_20C3M-1_R1_18610101-20001231";
/>
<netcdf
location="http://data1.gfdl.noaa.gov:8780/thredds/dodsC/tasmin_daily_20C3M-1_R1_18610101-20001231";
/>
</aggregation>
</netcdf>
With:
<netcdf xmlns="http://www.unidata.ucar.edu/namespaces/netcdf/ncml-2.2";>
<aggregation type="union">
<netcdf>
<aggregation dimName="time" type="joinExisting">
<netcdf
location="file:/data/gfdl_cm2_1/CM2.1U-D4_1860-2000-AllForc_H1/pp/atmos/ts/daily/tasmax_A2.18610101-19001231.nc"
ncoords="14600" />
<netcdf
location="file:/data/gfdl_cm2_1/CM2.1U-D4_1860-2000-AllForc_H1/pp/atmos/ts/daily/tasmax_A2.19010101-20001231.nc"
ncoords="36500" />
</aggregation>
</netcdf>
<netcdf>
<aggregation dimName="time" type="joinExisting">
<netcdf
location="file:/data/gfdl_cm2_1/CM2.1U-D4_1860-2000-AllForc_H1/pp/atmos/ts/daily/tasmin_A2.18610101-19001231.nc"
ncoords="14600" />
<netcdf
location="file:/data/gfdl_cm2_1/CM2.1U-D4_1860-2000-AllForc_H1/pp/atmos/ts/daily/tasmin_A2.19010101-20001231.nc"
ncoords="36500" />
</aggregation>
</netcdf>
<netcdf>
<aggregation dimName="time" type="joinExisting">
<netcdf
location="file:/data/gfdl_cm2_1/CM2.1U-D4_1860-2000-AllForc_H1/pp/atmos/ts/daily/tasmin_A2.18610101-19001231.nc"
ncoords="14600" />
<netcdf
location="file:/data/gfdl_cm2_1/CM2.1U-D4_1860-2000-AllForc_H1/pp/atmos/ts/daily/tasmin_A2.19010101-20001231.nc"
ncoords="36500" />
</aggregation>
</netcdf>
</aggregation>
</netcdf>
