International Business Machines Corporation

King Company

Scott Thomas Jones

Frank Eliot Levine

Mark Joseph Hamzy

Phani Gopal V Achanta

Michael Wayne Brown

Robert John Urquhart

Riaz Yousuf Hussain

Michael Richard Cooper

Enio Manuel Pineda

Mark Wayne VanderWiele

Milena Milenkovic

Marc Leslie Cohen

Michael A Paolini

Graham Alan Chapman

William Preston Alexander, Iii

David Earl Blaschke

Maciek Klimkowski

Steven L Pratt

Michael Aaron Kaply

Kean G Kuiper

Jeffrey Allen Jones

Ravi Ravisankar

Luc Rene Smolders

Alvaro Sanchez-Cifuentes

Peter A Zannucci

Lee Martin Tartak

Mark Wayne Vander Wiele

A computer implemented method, apparatus, and computer program product for managing garbage collection. Monitoring is performed for a garbage collection state in a virtual machine. Responsive to detecting the garbage collection state, a priority for a set of garbage collection threads is increased.

Managing garbage collection in a data processing system

A capture system captures detectable attributes of a user. A differential system compares the detectable attributes with a normalized model of attributes, wherein the normalized model of attributes characterize normal representative attribute values across a sample of a plurality of users and generates differential attributes representing the differences between the detectable attributes and the normalized model of attributes. Multiple separate avatar creator systems receive the differential attributes and each apply the differential attributes to different base avatars to create custom avatars which reflect a selection of the detectable attributes of the user which are distinguishable from the normalized model of attributes.

Creating a customized avatar that reflects a user's distinguishable attributes

A sample is generated based on an event. Further, an interrupt handler captures information for an interrupted thread on a current processor. In addition, an affinity of the interrupted thread is set such that the interrupted thread runs only on the current processor without being able to migrate to a different processor. A sampler thread that runs on the current processor retrieves a call stack associated with the interrupted thread after the affinity of the interrupted thread has been set to the current processor. The affinity of the interrupted thread is restored after the call stack has been retrieved.

Performing call stack sampling by setting affinity of target thread to a current process to prevent target thread migration

A computer implemented method, apparatus, and computer usable program code for sampling call stack information. Monitoring for an event is performed during an execution of a plurality of threads by a set of processors. A portion of the plurality of threads is identified based on a policy to form a set of identified threads in response to an occurrence of the event. Call stack information is collected for the set of identified threads using an under utilized processor in a set of processors in response to identifying the portion of the plurality of threads, wherein the call stack information is used to profile a processor in the set of processors.

Call stack sampling to obtain information for analyzing idle states in a data processing system

Disclosed is a method to track allocation of a plurality of objects in a heap. A data processing system, during an object allocation, prevents an object from being moved to another place in memory or being deleted. The data processing system prevents such activity concurrently with garbage collection on a second object not currently being allocated. The data processing system notifies a profiler of object information based on the object allocation via a callback function, wherein object information is a one-to-one mapping of the object address. The data processing system revives garbage collector processing of the object.

Method for simultaneous garbage collection and object allocation

Disclosed is a computer program product to track allocation of a plurality of objects in a heap. A data processing system, during an object allocation, prevents an object from being moved to another place in memory or being deleted. The data processing system prevents such activity concurrently with garbage collection on a second object not currently being allocated. The data processing system notifies a profiler of object information based on the object allocation via a callback function, wherein object information is a one-to-one mapping of the object address. The data processing system revives garbage collector processing of the object.

Virtual machine tool interface for tracking objects

A computer implemented method, apparatus, and computer program product for processing events. Events occurring during execution of an application are monitored to form monitored events. A plurality of sequences of method types and transition types from the monitored events are identified to form an identified plurality of sequences of method types and transitions types. Overhead compensation values are identified for the identified plurality of sequences of method types and transitions types to form identified overhead compensation values. Observed metrics for the monitored events are adjusted using the identified overhead compensation values.

Compensating for instrumentation overhead using sequences of events

A computer implemented method for sampling call stack information. Responsive to identifying a set of interrupts, a determination is made as to whether all processors in a plurality of processors have generated the set of interrupts. A number of addresses are identified for a set of interrupted threads identified by the set of interrupts response to a determination that all of the processors have generated the set of interrupts. A determination is made as to whether the identified address falls within a set of address ranges. Responsive to a determination that the identified address falls within the set of address ranges, a sampler thread is notified to obtain call stack information.

Call stack sampling for a multi-processor system

A computer implemented method, apparatus, and computer usable program code for sampling call stack information. An accumulated latency time is monitored for a set of threads executing in a data processing system. The call stack information is obtained for the thread in response to a thread in the set of threads having an associated accumulated latency exceeding a threshold.

Call stack sampling for threads having latencies exceeding a threshold

A computer implemented method, apparatus, and computer program code for profiling an application. Execution of an application is monitored. A set of metrics relating to execution of the application occurring during monitoring execution of the application are collected to form a set of observed metrics. An execution environment overhead occurring with respect to the set of observed events is identified to form an identified execution environment overhead. The set of observed metrics is adjusted using the identified execution environment overhead to form a set of calibrated metrics.

Compensating for instrumentation overhead using execution environment overhead

Methods, systems, and products are provided that display memory statistics for a keydrive that do not require the keydrive to be plugged into another device. Displaying memory statistics according to embodiments of the present invention include receiving a command resulting in a change to the memory usage of the keydrive, calculating memory statistics describing the current state of memory usage of the keydrive, storing the memory statistics in memory on the keydrive, and displaying the memory statistics on a display on the keydrive. Calculating memory statistics describing the current state of memory usage of the keydrive may be carried out by calculating a total memory usage of the keydrive. Calculating memory statistics describing the current state of memory usage of the keydrive may also be carried out by calculating a percent of total memory used.

Displaying memory statistics for a keydrive

A text modification mechanism is provided for formatting data such that the information can be reasonably deciphered by a human, but cannot be easily recognized by computer recognition techniques. The text modification mechanism alters printed text so that computer recognition of characters becomes difficult. Modification of the text may be accomplished with manipulation of the fonts or the background. The mechanism may also modify the text based on user preferences.

Method, apparatus, and program to prevent computer recognition of data

The present invention provides a method and apparatus in a data processing system for printing characters. Data received includes glyphs for output on an output device, wherein the glyphs are to be output using a selected device font. Monitoring for unsupported glyphs in the selected device font is performed. In response to detecting a glyph unsupported by the selected device font, a back up system font is used to output the glyph to the output device.

Growing community of inventors

Austin, TX, United States of America

Scott Thomas Jones