Peter H. Hauschildt
Dept. of Physics and Astronomy & Center for Simulational Physics,
University of Georgia, Athens, GA 30602-2451
Email: yeti@hal.physast.uga.edu
David K. Lowenthal
Dept. of Computer Science,
University of Georgia, Athens, GA 30602
Email: dkl@cs.uga.edu
E. Baron
Dept. of Physics and Astronomy, University of
Oklahoma, 440 W. Brooks, Rm 131, Norman, OK 73019-0225;
Email: baron@phyast.nhn.ou.edu
We describe two parallel algorithms for line opacity calculations based on a local file and on a global file approach. The performance and scalability of both approaches is discussed for different test cases and very different parallel computing systems. The results show that a global file approach is more efficient on high-performance parallel supercomputers with dedicated parallel I/O subsystem whereas the local file approach is very useful on farms of workstations, e.g., cheap PC clusters.