Mark A Boegel

US Patent:

54406978, Aug 8, 1995

Filed:

Oct 18, 1993

Appl. No.:

8/138602

Inventors:

Mark A. Boegel - Rochester MN
Douglas O. Bolstad - Rochester MN
Stephen A. Knight - Rochester MN
Harvey G. Kiel - Rochester MN
Robert R. Nelson - Oronoco MN
Pamela A. Wright - Rochester MN

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 1310

US Classification:

395500

Abstract:

A computer system comprises a CPU, a main memory, and plurality of I/O Processors (IOPs), coupled to each other by a system I/O bus. The IOPs perform slave processing functions relating to I/O devices. A simulation protocol is defined for the IOPs, whereby the host CPU can command an IOP to execute a simulation script. The simulation script defines one or more I/O devices to be simulated, and specifies a simulated workload associated with the devices. The IOP executes the simulation script by sending simulated input streams to the host and receiving output destined for the simulated I/O devices from the host on the system I/O bus. An IOP may simulate multiple I/O devices, and may simulate I/O devices concurrently with servicing real I/O devices. In typical use, one or more applications programs will execute on the CPU concurrently with the execution of one or more simulation scripts in the IOPs attacked to the system I/O bus. The behavior of the system under such conditions can be used for capacity planning forecasts, for developing and debugging the application software, for reproducing and diagnosing intermittent error conditions, or for performing other tasks in which it is necessary to determine the characteristics of the system under hypothetical conditions.

US Patent:

60119152, Jan 4, 2000

Filed:

Oct 7, 1997

Appl. No.:

8/946239

Inventors:

Kenneth Dale Aaker - Rochester MN
Mark Arnold Boegel - Rochester MN
Harvey Gene Kiel - Rochester MN
Thomas Edwin Murphy - Binghamton NY
Paul Francis Rieth - Apalachin NY
Anthony Paul Vinski - Rochester MN

Assignee:

International Business Machines Corporation - Armonk NY

International Classification:

G06F 9445

US Classification:

39550044

Abstract:

Provided are a method and system for replacing terminals, linked in a client server relationship with a central server, interacting with hardware specific programs within the central server, and wherein each terminal is identified by hardware specific programs within said central server via specific hardware attributes, and where the specific hardware attributes include at least a port identification and an I/O processor identification associated with the port identification. The method and system achieve the foregoing via the following. A processor is substituted for a selected terminal. Particular hardware attributes of the selected terminal are identified. The identified particular hardware attributes of the selected terminal are emulated using communications software. And, the processor is coupled to the central server via the communications software such that the processor interacts with hardware specific programs within the central server such that the substituted processor interacts with the hardware specific programs in a fashion indistinguishable from the selected terminal.