On Thu, Aug 19, 2010 at 4:54 AM, James McCreight <mccreigh at gmail.com> wrote: > Thanks Glynn- > that's exactly the problem. I've never heard of ulimit (I try not to keep so > many files open!). SO glad I know! We have some documentation here: http://grass.osgeo.org/wiki/Memory_issues Please expand it, if needed. thanks Markus