Hi Zeke, Thanks for the input. I did arrive at a solution after contacting SAS tech support. The problem related to an I/O mismatch originating in the usage of proc nlp with huge datasets. I was able to correct this by specifying the -SGIO option in the command line when launching SAS. This is the scatter-read / gather-write method which provides improved throughput in accessing the available cache. I hope that is helpful to others that may encounter similar issues, though I suspect this will be specific to the usage of proc nlp with large (~50 GB) datasets. To clarify, this was occuring in a desktop Windows environment w/SAS 9.4, was unrelated to RAM usage or available memory (I have 16 GB, no more than 8-10 used when the proc failed), and was also unrelated to log output (as I indicated was re-directed to a dummy file via proc printto, a step I suggest for any doing large, multi-step simulations that will quickly choke your log).
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