Michelle L Lang

US Patent:

6879939, Apr 12, 2005

Filed:

Dec 27, 2002

Appl. No.:

10/330972

Inventors:

Michelle J. Lang - Minneapolis MN, US
William Judge Yohn - Shoreview MN, US

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G06F015/16

US Classification:

702186, 709229

Abstract:

A method and apparatus for controlling a distribution of sizes of input/output (I/O) operations in testing a data processing system. A plurality of I/O operations of different sizes are issued in response to a set of distribution parameter values. Each distribution parameter value specifies a number of I/O operations to issue for one or more sizes of I/O operations. The I/O operations are verified for correctness after completion. While issuing the I/O operations, performance characteristics of the data processing system are measured. In response to the performance characteristics relative to target performance characteristics, the distribution parameter values are selectively adjusted.

US Patent:

7032133, Apr 18, 2006

Filed:

Jun 6, 2002

Appl. No.:

10/164877

Inventors:

Michelle J. Lang - Minneapolis MN, US
William Judge Yohn - Shoreview MN, US

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G06F 11/00

US Classification:

714 33, 714 32

Abstract:

A method and apparatus for testing a computing arrangement. In various embodiments, a plurality of parameter definitions are established, including a static-value parameter and a dynamic-value parameter. A plurality of sets of parameter values are established in association with the parameter definitions. A results storage area has portions respectively associated with the sets of parameter values. A test program is associated with the parameter definitions and is configured to execute using one set of parameter values at a time. The test program inputs a parameter value associated with a static parameter, automatically generates a value for each dynamic parameter, and exercises the computing arrangement using the parameter values in a set, the value of each parameter affecting behavior of the computing arrangement via the test program. The test program further stores data resulting from execution of the test program in portions of the results storage area respectively associated with the sets of parameter values. In another embodiment, a feedback mechanism adjusts parameter values in the sets to automate the process of constructing suitable sets of values.

US Patent:

7058665, Jun 6, 2006

Filed:

Jun 21, 2002

Appl. No.:

10/177085

Inventors:

Michelle J. Lang - Minneapolis MN, US
William Judge Yohn - Shoreview MN, US

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G06F 17/30

US Classification:

707201, 8205, 711113, 711141

Abstract:

A method and apparatus for testing data coherency in a file system implemented on a data processing arrangement. A record of file addresses is maintained for addresses that are not targeted by write operations, and word address ranges for write operations are selected from the record of file addresses not targeted by other write operations. A plurality of asynchronous write operations that specify word address ranges and data to be written are issued. For each completed write operation, an asynchronous read operation that references the address range of the completed write operation is issued. The data returned from the read operation is verified against data issued in the completed write operation. The record of file addresses not targeted by write operations is updated when the verifying step is complete.

US Patent:

7065676, Jun 20, 2006

Filed:

Dec 27, 2002

Appl. No.:

10/330714

Inventors:

Michelle J. Lang - Minneapolis MN, US
William Judge Yohn - Shoreview MN, US

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G06F 11/00

US Classification:

714 33, 714 32

Abstract:

A system and method for testing memory management functions of a data processing system. A controller is configured to start and monitor progress of one or more programs, and each of the one or more programs is configured to start a number of threads as specified by input parameter values. At least one or more of the threads are configured to create, modify, and delete one or more memory areas. A feedback activity measures performance characteristics of the data processing system while the one or more threads are executing and selectively adjusts the parameter values in response to the performance characteristics relative to target performance characteristics.

US Patent:

7200721, Apr 3, 2007

Filed:

Oct 9, 2002

Appl. No.:

10/268238

Inventors:

Michelle J. Lang - Minneapolis MN, US
William Judge Yohn - Shoreview MN, US

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G06F 12/00

US Classification:

711141, 711129, 711153

Abstract:

A method and apparatus for testing cache coherency in a multiprocessor data processing arrangement. Selected values are written to memory by a plurality of threads, and consistency of the values in the memory with the values written by the plurality of threads is verified. Performance characteristics of the data processing system are measured while writing the values, and in response to the performance characteristics relative to target performance characteristics, parameters that control writing by the plurality of threads are selectively adjusted.

US Patent:

6795790, Sep 21, 2004

Filed:

Jun 6, 2002

Appl. No.:

10/165505

Inventors:

Michelle J. Lang - Minneapolis MN
William Judge Yohn - Shoreview MN

Assignee:

Unisys Corporation - Blue Bell PA

International Classification:

G06F 15173

US Classification:

702123

Abstract:

A method and apparatus for creating sets of parameters values for scenarios for testing a computing arrangement. In a first phase of parameter optimization, each parameter value is adjusted one at a time, and a measured performance characteristic controls when to stop considering alternative values for the parameter. When the performance characteristic satisfies selected criteria relative to the target data set, another parameter value is selected for adjustment. Each parameter is assigned to a group as a function of the level of change of the performance characteristic from one value of the parameter to another. In a second phase of parameter optimization, each parameter value is adjusted in order of parameters in groups that exhibit greater levels of change of the performance characteristic to parameters in groups that exhibit lesser levels of change of the performance characteristic.