DATA FLOW AND STORAGE ALLOCATION FOR THE PDQ-5 PROGRAM ON THE PHILCO-2000
Technical Report
·
OSTI ID:4695617
PDQ-5 is a FORTRAN program that solves the twodimensional few-group time- independent neutron-diffusion equations. The discrete approximation of these equations results in a matrix eigenvalue problem. The iteration technique (three- line cyclically reduced successive overrelaxation) employed by the program to effect the inversion of very large matrices requires sweeping of data repetitively from magnetic tapes. The internal speed of the computer relative to tape speed is such that, if only one iteration were performed per tape sweep, the program would run effectively at tape speed despite efficient buffering of the tape data. The device employed in PDQ-5 to circumvent this problem is the use of simultaneous iterations; i.e., more than one iteration per tape sweep. The storage allocation described is that used to support a variable number of simultaneous iterations. (auth)
- Research Organization:
- Westinghouse Electric Corp. Bettis Atomic Power Lab., Pittsburgh
- DOE Contract Number:
- AT(11-1)-GEN-14
- NSA Number:
- NSA-17-028228
- OSTI ID:
- 4695617
- Report Number(s):
- WAPD-T-1589
- Country of Publication:
- United States
- Language:
- English
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