1Dept. of Physics and Astronomy, University of Georgia, Athens, GA 30602-2451; yeti@hal.physast.uga.edu

2Dept. of Physics and Astronomy, Arizona State University, Tempe, AZ 85287-1504

3Dept. of Physics and Astronomy, University of Oklahoma, 440 W. Brooks, Rm 131, Norman, OK 73019-0225; baron@phyast.nhn.ou.edu

4Dept. of Physics, Wichita State University, Wichita, KS 67260-0032; allard@eureka.physics.twsu.edu

We describe the parallel implementation of our generalized stellar
atmosphere and NLTE radiative transfer computer program `PHOENIX`. We
discuss the parallel algorithms we have developed for radiative
transfer, spectral line opacity, and NLTE opacity and rate calculations.
Our implementation uses a MIMD design based on a relatively small
number of `MPI` library calls. We report the results of test
calculations on a number of different parallel computers and
discuss the results of scalability tests.

- Introduction
- Basic numerical methods
- Machines used for testing
- Parallel radiative transfer
- Parallelization of the line opacity calculation
- Parallelizing NLTE calculations
- Performance for realistic full model calculations
- Conclusions
- References
- Figures
- About this document ...