International Business Machines Corporation

Mei-Hui Wang

Robert O Dryfoos

Peter Grimm Sutton

Shawfu Chen

Allan Feldman

Jason A Keenaghan

David Y Hu

Peter A Lewis

Daniel S Gritter

Gerald B Strait

Alice M Williams-Obleton

Colette Manoni

Joshua B Wisniewski

Barry M Baker

Sunil Shenoi

Yuk S Tam

A common symbol table is generated, which includes symbols of a plurality of independent applications. The symbols included in the common symbol table are common symbols of the applications. The bulky information associated with the common symbols are stored in the common symbol table, and stubs used to locate the common symbols are stored in local tables of the applications.

Generating a common symbol table for symbols of independent applications

A method for enhancing debugger performance of hardware assisted breakpoints across multiple units includes deferring all active location breakpoints within the multiple modules, and subsequently activating each valid location breakpoint in a present one of the multiple modules being entered.

Method for enhancing debugger performance of hardware assisted breakpoints

A plurality of batch lists are maintained by a channel in order to improve the efficiency of the channel in performing messaging between a sender and a receiver. For example, a Next Batch list is used to prefetch messages to be sent to the receiver from the sender; a Current Batch list includes the messages currently being transmitted to the receiver or waiting confirmation; and an Acknowledged Batch List includes the messages confirmed by the receiver. This allows the functions of prefetching messages, sending messages and deleting confirmed messages to be performed in parallel.

Method, system and program storage device for accessing memory to perform messaging using a channel coupled to a sender and a receiver

Performance of channels used in communicating between senders and receivers

A highly available, high-performance memory queue. Locking of the queue is minimized in order to provide a highly available queue and to improve performance of the queue. Multiple updates of the queue can occur under a single lock. Further, messages of the queue are persistent. A time-initiated checkpointing process, as well as the storing of message information on a recovery log, ensures the persistence of the queue messages.

High-performance memory queue

Memory resident queues are monitored at predefined time intervals. When the monitoring indicates that a particular queue is not being serviced at a desired level, then action is taken to sweep one or more messages from the queue. The sweeping of the messages frees up system resources associated with the messages, thus allowing other tasks to be serviced. If, after the sweeping, it is determined that the queue can handle additional messages, then one or more messages are placed back on the queue.

Managing memory resident queues to control resources of the systems using the queues

The use of aliases in the debugging of applications is facilitated. Aliases are used in debugging, even when the aliases are not known to the debug generation stage of the compiler. That is, aliases are used in debugging, even when debug information is not generated by the compiler for the aliases. In order to use the aliases in debugging, the aliases are resolved to their formal names, and then debug information corresponding to the formal names, and thus, the aliases, is obtained.

Facilitating the use of aliases during the debugging of applications

When a processor becomes inactive, queues resident in the memory of that processor become inaccessible. Thus, in order to access those queues, an active processor takes over ownership of one or more of the inaccessible queues. Each queue may be rebuilt prior to its take over to ensure that it has up-to-date information.

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Brookfield, CT, United States of America

Mei-Hui Wang