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Thanks for the quick follow-up, Ed. Two amplifications on your answer would be helpful:nc_set_log_level(3); (There is also a fortran version.)I noticed this mentioned in passing in the mail archives, but do not see it in any of the manuals. I'll just give "nc_set_log_level(5, err)" a try in the f90 code. I am using the Version 4.1.3 NetCDF Installation and Porting Guide and Fortran 90 Interface Guide, among others. Am I missing a useful source of documentation?If this doesn't work, fire up the parallel debugger and see where HDF5 andnetCDF are failing to get along... That is my normal inclination. However, the code isn't crashing. put_var() is just returning a ""NetCDF: HDF error" and continuing on its way - with data missing in the file. The parameters look the same as other valid iterations (I am trapping the error and printing them out) so I am not sure what to look for at that point. Any clues appreciated.
I have tried the TotalView debugger with the libraries and it is really a nightmare if you don't know the code intimately. The problem is that there a lot of recursive calls which make debugging more difficult. This is not a trivial library to debug. I spend several days looking and I was not able to find the source of my parallel problem. Our parallel I/O in ROMS is broken with the new versions of the NetCDF library. It works only with NetCDF 4.1.1. Several changes were done after that and the parallel I/O no longer works with independent I/O access . I need to go back to the parallel debugger when I get the chance. This is the third time that it happens so it is a little annoying. Still, the performance of parallel I/O with the NetCDF4/HDF libraries is not that great... I cannot even match the performance of serial I/O. There is room for a lot of improvements. I did noticed a lot of inefficient MPI communications during my debugging session. In my opinion, the parallel stuff needs to be redesigned and written from scratch to see if we can improve the performance. It is nice to know about the nc_set_log_level call to get detailed information. Best, H ---------------------------------------------------------------------- Hernan G. Arango Institute of Marine and Coastal Sciences arango@xxxxxxxxxxxxxxxxxx Rutgers University off: (732) 932-6555 x266 71 Dudley Road FAX: (732) 932-6520 New Brunswick, NJ 08901-8521, USA http://marine.rutgers.edu/po/arango http://www.myroms.org http://www.ocean-modeling.org