VS FORTRAN

Compiler, library and interactive debugging for IBM z/OS and z/VM applications

IBM® VS FORTRAN includes a compiler, a library and interactive debugging facilities. It compiles and generates applications for the IBM z/OS® and IBM z/VM® platforms.

VS FORTRAN delivers:

  • Scalar, vector and parallel processing—performs vector and parallel processing and standard sequential (serial) processing within a single program.
  • IBM OS/390® enhancements—includes I/O and other enhancements for the IBM OS/390 platform.
  • Language support—complies with language standards and extensions.

Scalar, vector and parallel processing

  • Provides optimized scalar processing for high serial program performance.
  • Offers vector processing on the IBM ES/3090 Vector Facility and expanded processing for enhanced vector performance on the ES/9000 Vector Facility.
  • Supports automatic parallelism and explicit parallel language for applications on IBM multiprocessing hardware.

OS/390 enhancements

  • VS FORTRAN supports I/O data striping for faster execution of sequential I/O on OS/390.
  • OS/390 users can specify the number of I/O buffers to be used on a unit-by-unit basis.
  • There are 225 buffers allowed and maintained by the library I/O routines and buffer residency above the 16 MB area using IBM DFSMS 1.1 or greater.
  • VS FORTRAN provides data-in-virtual support for OS/390.

Language support

  • VS FORTRAN complies with the FORTRAN 77 language standard.
  • It provides expanded compatibility with the IBM RS/6000® XL Fortran language for improved cross-platform and host-workstation cooperation.
  • VS FORTRAN includes industry-standard extensions to Fortran to provide multi-vendor compatibility.
  • It supports extended-precision (64-bit) integers.
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VS FORTRAN

Compiler, library and interactive debugging for IBM z/OS and z/VM applications

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System requirements

VS FORTRAN runs on OS/390 and VM/ESA.

For MVS environments


Operating SystemSoftwareHardware
MVS/ESA, OS/390, z/OS Minimum requirement is MVS/ESA Version 4 and MVS/ESA DFP Version 3 or higher. Current operating system is z/OS (see Related Software link). Runs on any hardware that supports the required software. Current hardware is zSeries Server (see Related Hardware link).

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For VM environments


Operating SystemSoftwareHardware
VM/ESA, z/VM Mininum requirement is VM/ESA Version 1.0 or later. Current operating system is z/VM (see Related Software links). Runs on any hardware that supports the software. Current hardware is zSeries Server (see Related Hardware link).

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