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> "Robert E. McGrath" <mcgrath@xxxxxxxxxxxxx> writes: > > > In general, any update to the file in parallel needs to be done > > thoughtfully, and generally should be done in batches rather than > > small increments. > > > > Extending by single records is inefficient in all cases, but > > very costly in parallel, since it updates a global state. > > > > Does that mean parallel programmers generally don't use unlimited > dimensions? Or they use them, but batch their extends to avoid this > problem? As Bob says, it is certainly possible to use unlimited dimensions in parallel, but as you say, I think most people batch their extends. > Or do they use them, but do something else to prevent this problem. Nothing else really occurs to me as a good solution. :-) Quincey > Thanks for helping me understand this! > > Ed > > > -- > Ed Hartnett -- ed@xxxxxxxxxxxxxxxx >