I am getting a MemoryError from a numpy.fromfile() call in an application I am trying to deploy. Normally I would assume that this would mean that I don't have enough memory available on the system. However, if I run vmstat (Linux) at the same time as my process, I see that I have 3+ Gigabytes of memory free, and no swap space being used. I can't think of a way to track down this problem, so I'm punting to the list. The only thing I can imagine is that someone Python has been allocated X amount of space (very small relative to the memory actually available), and is asking for more than X. I don't know if this is true, or if there is even a way to check it. Sigh. Version info: Linux RedHat 5 kernel 2.6.18-128.1.10.el5PAE Python 2.5.4 -- EPD_Py25 4.3.0 numpy 1.3.0 Can anyone suggest more tests that I can do? Thanks, Mike