公开(公告)号：AU605562B2

公开(公告)日：1991-01-17

申请号：AU1325288

申请日：1988-03-17

Applicant: PRIME COMPUTER INC

Inventor： LEFSKY BRIAN ,  ARDINI JOSEPH L JR ,  SCHWARTS MICHAEL

IPC: G06F1/10 ,  G06F9/38 ,  G06F1/04

公开(公告)号：AU603876B2

公开(公告)日：1990-11-29

申请号：AU1326688

申请日：1988-03-18

Applicant: PRIME COMPUTER INC

Inventor： PRESANT STEPHEN D

IPC: G06F9/48 ,  G06F9/50 ,  G06F13/10 ,  G06F15/16 ,  G06F15/177 ,  G06F13/42

公开(公告)号：CA1273125A

公开(公告)日：1990-08-21

申请号：CA521346

申请日：1986-10-24

Applicant: PRIME COMPUTER INC

Inventor： CHAN CARL ,  FEUSTEL EDWARD A

IPC: G06F12/10 ,  G06F9/48 ,  G06F12/08

Abstract: Methods and apparatus are described for implementing fork operations on UNIX or UNIX-emulating operating systems, particularly in multi-user environments. The invention reduces the copy time, the number of page faults and, consequently the input-output ("I/0") operations between the central processing Unit, main memory and auxilliary memory. In one aspect of the invent-on, 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 optimal procedures based on the amount of excess capacity in main memory.

公开(公告)号：CA1246233A

公开(公告)日：1988-12-06

申请号：CA501912

申请日：1986-02-14

Applicant: PRIME COMPUTER INC

Inventor： IRUKULLA SUREN ,  PATEL BIMAL V

IPC: G06F7/537 ,  G06F1/02 ,  G06F1/035 ,  G06F7/52 ,  G06F7/535

Abstract: The invention relates to a range transformation method for transforming the normalized divisor in a division calculation to a range wherein the transformed value differs from one by no more than the quantity 2-n. The method and apparatus generate the transform multiplier value from a first high order ''q'' digits of the divisor and generate an out-of-range indicator signal from at least those same digits. The thus generated multiplier value is modified in response to the out-of-range indicator signal when an out-of-range condition is indicated. The apparatus employs a read-only-memory for enabling the generation of the transform multiplier value without requiring either large table look-up storage or multiplicative functions. As a result, various division methods requiring an initial transformation to provide a divisor which approaches one in value can be efficiently implemented.

公开(公告)号：CA1244140A

公开(公告)日：1988-11-01

申请号：CA501910

申请日：1986-02-14

Applicant: PRIME COMPUTER INC

Inventor： IRUKULLA SUREN ,  PATEL BIMAL V

IPC: G06F7/537 ,  G06F7/483 ,  G06F7/49 ,  G06F7/493 ,  G06F7/52 ,  G06F7/533 ,  G06F7/535

Abstract: The invention provides a method and apparatus for radix-.beta. non-restoring division. The division process occurs in four phases. In a first phase, the input operands are transformed to produce a divisor lying in a designated numerical range. Next, a transitional phase involves generating an initial radix-.beta. quotient digit from the transformed numerator. An iterative phase of the process generates succesive partial remainders according to a recursive method. From the sign and a single radix-.beta. digit of each of these partial remainders, the process generates a radix-.beta. quotient digit. Further, a fourth phase, which may run concurrently with the transitional and iterative phases, involves accumulating succesively generated quotient digits to produce a final quotient value.

公开(公告)号：AU1329288A

公开(公告)日：1988-10-13

申请号：AU1329288

申请日：1988-03-18

Applicant: PRIME COMPUTER INC

Inventor： LEFSKY BRIAN ,  NATUSCH MARY ELLEN

IPC: G06F11/00 ,  G06F11/10 ,  G06F11/20 ,  G06F12/08 ,  G06F12/12 ,  G06F12/16 ,  G06F12/00

公开(公告)号：AU1326688A

公开(公告)日：1988-10-13

申请号：AU1326688

申请日：1988-03-18

Applicant: PRIME COMPUTER INC

Inventor： PRESANT STEPHEN D

IPC: G06F9/48 ,  G06F9/50 ,  G06F13/10 ,  G06F15/16 ,  G06F15/177 ,  G06F13/42

公开(公告)号：AU1326588A

公开(公告)日：1988-10-13

申请号：AU1326588

申请日：1988-03-18

Applicant: PRIME COMPUTER INC

Inventor： ARDINI JOSEPH L JR ,  FARR BARBARA ,  LEFSKY BRIAN

IPC: G01R31/26 ,  G01R31/28 ,  G01R31/30 ,  G01R31/317

公开(公告)号：CA1223973A

公开(公告)日：1987-07-07

申请号：CA473958

申请日：1985-02-08

Applicant: PRIME COMPUTER INC

Inventor： RODMAN PAUL K ,  ARDINI JOSEPH L JR ,  PAPWORTH DAVID B

IPC: G06F15/16 ,  G06F12/00 ,  G06F12/08 ,  G06F12/084 ,  G06F15/177 ,  G06F13/16

Abstract: A multiprocessor data processing system in which a number of independent processors can concurrently operate on a shared memory even when one processor is performing a read-modify-write (RMW) operation, the system having a locking, content-associative write buffer and a controller for identifying RMW requests, for addressing the buffer and, for issuing directives to lock the buffer, to validate particular data blocks in the buffer and to transfer data back and forth between the processors, the memory and the buffer.

公开(公告)号：AU1828283A

公开(公告)日：1985-02-07

申请号：AU1828283

申请日：1983-07-11

Applicant: PRIME COMPUTER INC

Inventor： JONES PAUL R ,  ARDINI JOSEPH L ,  JONES WALTER A ,  PAPWORTH DAVID B ,  RODMAN PAUL K ,  BECKWITH ROBERT F ,  CHIH-PING CHEN

IPC: G06F15/00