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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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On Wed, 2008-02-13 at 09:49 -0700, Ed Hartnett wrote: > Thomas Green <thomas.green@xxxxxxxxxxxxxxxx> writes: > > > Fellow NetCDF users, > > > > I am currently evaluating NetCDF on a number of platforms but I am > > having difficulty with using NetCDF4 on a NEC SX-6. I follow the > > instructions and get everything compiled without any problems but I have > > problems at runtime. (I have tried both parallel and serial versions). > > > > I have traced the problem to the new HDF5 library which fails on its own > > make tests (and I can also use the NetCDF4 library using NetCDF3 classic > > mode). I have emailed the HDFgroup support but since NEC is not > > supported by them there is not much they can do. > > > > I am really after anyone out in NetCDF world who is on the bleeding edge > > with NetCDF4 and is on an NEC. The new NetCDF4 capabilities are really > > useful and I have them running on Linux with no problems. > > > > Any pointers welcome. I can provide the support request I emailed > > help@xxxxxxxxxxxx if people need more details about the error. > > > > Many thanks, > > > > Tom > > Howdy Tom! > > As you note, if the HDF5 library won't work, there's not much to be > done on the netCDF end. > > If I were you, I might try and get HDF5 to work on NEC. Frequently, > porting to a new machine is not that big of a deal. > > However, the HDF5 porter is no doubt firing up his email to tell me > that it can also be very difficult. (Hi Kent!). Of course he is > correct. > > But frequently this task is easiest for a platform specialist, so if > you know the NEC, you might be the best person to try it. > > Thanks! > > Ed Ed, Many thanks for the vote of confidence on my porting abilities. I might try and dig a bit more into the source code. My first idea was the io performance affecting the HDF5 library since if I change the option in the HDF tests to stress the IO less it seems to get a bit further (eventually same error though) but it could also be a coincidence. We currently have to use a large chunksize with NetCDF3 files on the NEC to realise its full io potential (approx 32mb). I was trying to find out how HDF5 behaves with io which requires large data transfers so its uses the faster pathway but I got as far as HDF property lists but didnt have time to dig much further. I will post here if I get any further. Thanks again, Tom --- Thomas Green Unified Model System Analyst Met Office FitzRoy Road Exeter EX1 3PB United Kingdom http://www.metoffice.gov.uk
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