Memory management system improving the efficiency of fork operat

Details Memory management system improving the efficiency of fork operat Memory management system improving the efficiency of fork operat

1985-10-24

1989-03-14

Zache, Raulfe B.

Boots, shoes, and leggings

364300, G06F 1500, G06F 1212

Patent

active

048129810

ABSTRACT:
Methods and apparatus for implementing fork operations on UNIX or UNIX-emulating operating systems, particularly in multi-user environments reduce the copy time, the number of page faults and, consequently the input-output ("I/O") operations between the central processing unit, main memory and auxilliary memory. In one aspect of the invention, fork operations are executed by redefining those pages of the parent process image resident in main memory as pages of a child process image and modifying the page maps accordingly. Page faults are thereby eliminated for pages located in auxiliary memory. Additional improvements in performance are obtained by monitoring the level of main memory utilization and selecting optical procedures based on the amount of excess capacity in main memory.

REFERENCES:
patent: 4104718 (1978-08-01), Poublan
patent: 4577274 (1986-03-01), Ho et al.
patent: 4584639 (1986-04-01), Hardy
patent: 4589093 (1986-05-01), Ippolito et al.
patent: 4758951 (1988-07-01), Sznyter, III
A UNIX System Implementation for System/370 by W. A. Felton, G. L. Miller, and J. M. Milner--published by AT&T Bell Laboratories Technical Journal, vol. 63, No. 8, Oct. 1984, pages 1751 through 1767.
Virtual Memory by Peter J. Denning--published in Computing Surveys, vol. 2, No. 3, Sep. 1970, pages 153 through 189.
The Evolution of UNIX System Performance by J. Feder--published by AT&T Bell Laboratories Technical Journal vol. 63, No. 8, Oct. 1984, pp. 1794-1814.

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