[MITgcm-support] combining multi-PE NetCDF files into a single file

[Martin Losch]

Eli,Ed,

I have just checked in a fix for the problems that I described earlier.  
Ed, I am pretty sure that this should also work with Matlab7, but I  
don't have Matlab7 available, could you please test it?

mnc_assembly.m should now work with output from multiple processors OR  
multiple tiles, but maybe not with mulitple tiles on multiple  
processors.

Martin

On Feb 1, 2005, at 5:48 PM, Martin Losch wrote:

> Eli, Ed,
>
> I have had difficulties with mnc_assembly and Matlab6.1. You'll have  
> to replace all "||" and "&&" by "|" and "&" in order to make it work  
> with Matlab_pre7 (I don't have Matlab7 so I cannot test it with a  
> later version.
>
> Stick to the example in  
> develmopment/edhill/mnc_assemply/mnc_assem_test.m: the argument vars  
> has to be a structure (not a cell as described in the help section of  
> mnc_assembly).
>
> Another problem:
> For my output mnc_assembly does not assemble anything, but writes only  
> one tile to the output file. I don't know why this is, but I suspect  
> is has to do with the bi,bj's in my netcdf files:
> they are all 1. Ed, I don't know whether I have this because don't use  
> the latest version of the code (haven't tried it, yet), or because  
> bi,bj=1 if you use only 1 tile per processor? Your examples all have  
> nPx=nPy=1 and nSx,nSy>1, whereas I have nSx=nSy=1 and nPx,nPy>1
>
> what do you think?
>
> Martin
>
>
> On Feb 1, 2005, at 5:02 PM, Ed Hill wrote:
>
>> On Tue, 2005-02-01 at 13:16 +0200, Eli Galanti wrote:
>>> hello,
>>>
>>> when running with packege mnc on several processors, how do I  
>>> combine the files
>>> into a single file?
>>>
>>> for example:
>>>
>>> grid.0000.000001.nc
>>> grid.0000.000002.nc
>>> grid.0000.000003.nc
>>> grid.0000.000004.nc
>>
>>
>> Hi Eli,
>>
>> A few of us have been using a MatLAB tool called "mnc_assembly.m"  
>> which
>> I just checked into CVS.  You can get it at:
>>
>>   MITgcm/utils/matlab/mnc_assembly.m
>>
>> and more information (including two complete sets of examples) is
>> available from our CVS server at these locations:
>>
>>   MITgcm/utils/matlab/README.txt
>>   development/edhill/mnc_assembly
>>
>> Please be aware that the tool was written to work with both MatLAB v7
>> (R14+) and the MatLAB NetCDF Toolbox:
>>
>> http://woodshole.er.usgs.gov/staffpages/cdenham/public_html/MexCDF/ 
>> nc4ml5.html
>>
>> so it may have some problems with older MatLAB versions.  And if you
>> have problems, send your bug reports to this list!
>>
>> Ed
>>
>> -- 
>> Edward H. Hill III, PhD
>> office:  MIT Dept. of EAPS;  Rm 54-1424;  77 Massachusetts Ave.
>>              Cambridge, MA 02139-4307
>> emails:  eh3 at mit.edu                ed at eh3.com
>> URLs:    http://web.mit.edu/eh3/    http://eh3.com/
>> phone:   617-253-0098
>> fax:     617-253-4464
>>
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