公开(公告)号：PL322830A1

公开(公告)日：1998-02-16

申请号：PL32283096

申请日：1996-07-11

Applicant: IBM

Inventor： BITTINGER REED RICHARD ,  FRAENKEL MICHAEL LEVI ,  HOUSEL BARRON CORNELIUS ,  LINDQUIST DAVID BRUCE

IPC: G06F13/00 ,  G06F12/00 ,  G06F15/00 ,  G06F17/30 ,  H04L29/06 ,  H04L29/08

Abstract: A method, apparatus and computer program product for reducing the data transmitted over an external communication link from a first application resident in a first computer to a second application resident in a second computer. The method, apparatus and computer program product include storing a data stream from the first application to be provided to the second application in response to a request from the second application in a cache resident in the first computer to create a server base cache entry and in a cache resident in the second computer to create a client base cache entry. Requests from the second application are interrogated to determine if a client base cache entry corresponding to the interrogated request exists and to determine if a server base cache entry corresponding to the interrogated request exists. The response data stream is intercepted prior to transmission of the response on the external communication link and compared to the server base cache entry to provide difference data corresponding to the difference between the intercepted response and the server base cache entry. The difference data is sent over the external communication link and acquired by the second computer which reconstructs the response data stream by combining the client base cache entry with the difference data to create a response data stream which is provided to the second application.

公开(公告)号：DE69029504T2

公开(公告)日：1997-07-17

申请号：DE69029504

申请日：1990-08-13

Applicant: IBM

Inventor： BLANDY GEOFFREY OWEN ,  EMMES DAVID BRUCE ,  HILL RONALD FRANKLIN ,  LINDQUIST DAVID BRUCE ,  PLAMBECK KENNETH ERNEST ,  SCALZI CASPER ANTHONY ,  SCHMALZ RICHARD JOHN

IPC: G06F12/10 ,  G06F12/14

Abstract: A single non-privileged instruction copies a page of data from a source virtual address to a destination virtual address, regardless of which of plural electronic storage media contain the page locations, and without the intervention of any supervisory program when media and virtual addressing have been previously determined for the locations of the subject pages. The instruction is not required to specify which of the plural media it will use, does not require its user to know what backing media it will access, does not require main storage (MS) to be one of its backing media, and allows different types of physical addressing to be used by the different backing media. The instruction can lock any page for use in an MP. No physical direction of data movement is provided within the non-privileged machine instruction, which only designates virtual direction of movement. The separation of virtual direction from physical direction is done by avoiding instruction control over selection of electronic media. The non-privileged instruction can nevertheless express a preference for obtaining a copy of the destination page in an electronic medium in which the content of the page can be processed by further instructions. Also, the instruction can cause invocation of a privileged control program to avoid the need for a following condition code test instruction. A privileged instruction is also provided to wait for the completion of the unprivileged instruction and to invalidate a non-main storage (MS) medium page whether it is unlocked or locked, either correctly or incorrectly.

公开(公告)号：DE69029504D1

公开(公告)日：1997-02-06

申请号：DE69029504

申请日：1990-08-13

Applicant: IBM

Inventor： BLANDY GEOFFREY OWEN ,  EMMES DAVID BRUCE ,  HILL RONALD FRANKLIN ,  LINDQUIST DAVID BRUCE ,  PLAMBECK KENNETH ERNEST ,  SCALZI CASPER ANTHONY ,  SCHMALZ RICHARD JOHN

IPC: G06F12/10 ,  G06F12/14

Abstract: A single non-privileged instruction copies a page of data from a source virtual address to a destination virtual address, regardless of which of plural electronic storage media contain the page locations, and without the intervention of any supervisory program when media and virtual addressing have been previously determined for the locations of the subject pages. The instruction is not required to specify which of the plural media it will use, does not require its user to know what backing media it will access, does not require main storage (MS) to be one of its backing media, and allows different types of physical addressing to be used by the different backing media. The instruction can lock any page for use in an MP. No physical direction of data movement is provided within the non-privileged machine instruction, which only designates virtual direction of movement. The separation of virtual direction from physical direction is done by avoiding instruction control over selection of electronic media. The non-privileged instruction can nevertheless express a preference for obtaining a copy of the destination page in an electronic medium in which the content of the page can be processed by further instructions. Also, the instruction can cause invocation of a privileged control program to avoid the need for a following condition code test instruction. A privileged instruction is also provided to wait for the completion of the unprivileged instruction and to invalidate a non-main storage (MS) medium page whether it is unlocked or locked, either correctly or incorrectly.