Software Environment
Most SX supercomputers run the SUPER-UX operating system (OS), and come with FORTRAN and C++ compilers. Cray has also developed an Ada compiler which is available as an option. Some vertical applications are available through NEC, but in general customers are expected to develop much of their own software.
The Earth Simulator uses a custom OS called "ESOS" (Earth Simulator Operating System). It has many features custom designed for the Earth Simulator which are not in the regular SUPER-UX OS.
In addition to commercial applications, there is a wide body of free software for the UNIX environment which can be compiled and run on SUPER-UX, such as Emacs, and Vim. A port of GCC is also available for the platform.
Read more about this topic: NEC SX Architecture
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