hmb1

@czender hi Charlie, I extracted this formula from your code - The area of an RLL cell. **area=(lon1-lon0) * ( sin(lat1) - sin(lat0) )** Sorry to be pedantic but do...

Hi Charlie, As with C language the operators ( *-, /=, -=, += ) only really make sense when the LHS of the expression is an lvalue or in ncap2...

1) The only rew chunk map output from ncks was 1032x29x35 2) time to chunk Please see [http://skyglow.ess.uci.edu/hbutowsk/chunking_bm_rew.html#time_to_chunk](http://skyglow.ess.uci.edu/hbutowsk/chunking_bm_rew.html#time_to_chunk) what is noticable is how fast the SSD on skyglow is --...

what I meant to say was that there is only one rew compatible map output from ncks. that is 1032x29x35. As mentioned before I cannot rechunk "cnk-tst-1032-29-35.nc" on skyglow with...

**why is nccopy faster than ncks for rechunking this large variable** var size 98128 x 277 x 349 Had a good look at the nccopy code: 1) nccopy uses a...

**why is nccopy faster than ncks for rechunking this large variable** I am with you on the variable level cache. I guess deep within the netcdf library is the function...

Hi Charlie, have crunched some bm's for: shapes shape(time=129,y=801,x=1600, NC_FLOAT) shape(time=256,y=801,x=1600, NC_FLOAT) please see below (its a bit rough) [http://skyglow.ess.uci.edu/hbutowsk/chunking_bm_shapes.html](http://skyglow.ess.uci.edu/hbutowsk/chunking_bm_shapes.html) Its becoming apparent that the best chunking map for spatial...

**working rhea** my workflow on a rhea compute node is to create target NetCDF file on /tmp. (example command. **nccopy -k 4 -c time/400,y/277,x/349 cnk-tst-cnt-spt.nc /tmp/cnk-tst.nc &** and then run...

**benchmark workflow** 1) Choose a 3D variable shape. ( timeD, yD, xD) Create a NetCDF3 64 bit file with the single variable of type NC_FLOAT with the given shape Populate...

**best chunking for several shapes** Have summarised the best chunking parameters for 4 given shapes: see the below web- page [http://skyglow.ess.uci.edu/hbutowsk/chunking_bm_shapes.html](http://skyglow.ess.uci.edu/hbutowsk/chunking_bm_shapes.html) ...Henry