Abstract: A reconnection system re-forms a control tree for an application that is executed in parallel without terminating execution of the application. The reconnection system detects when a node of a control tree has failed and directs the nodes that have not failed to reconnect to effect the re-forming of the control tree without the failed node and without terminating the application. Upon being directed to reconnect, a node identifies new child nodes that are to be its child nodes in the re-formed control tree. The node maintains the existing connection with each of its current child nodes that is also a new child node, terminates the existing connection with each of its current child nodes that is not also a new child node, establishes a new connection with any new child node that is not a current child node, and directs each new child node to reconnect.

Abstract: A reconnection system re-forms a control tree for an application that is executed in parallel without terminating execution of the application. The reconnection system detects when a node of a control tree has failed and directs the nodes that have not failed to reconnect to effect the re-forming of the control tree without the failed node and without terminating the application. Upon being directed to reconnect, a node identifies new child nodes that are to be its child nodes in the re-formed control tree. The node maintains the existing connection with each of its current child nodes that is also a new child node, terminates the existing connection with each of its current child nodes that is not also a new child node, establishes a new connection with any new child node that is not a current child node, and directs each new child node to reconnect.

Abstract: A multiprocessor computer system comprises a plurality of nodes and an application placement module operable to place an application on a selected group of the compute nodes. The application placement module includes a system tool helper operable to manage operation of a system tool on the selected group of the compute nodes, the system tool operable to monitor execution of the application. Managing system tool operation comprises at least one of distributing, executing, and ending the system tool on one or more compute nodes.

Abstract: A multiprocessor computer system comprises a plurality of nodes and an application placement module operable to place an application on a selected group of the compute nodes. The application placement module includes a system tool helper operable to manage operation of a system tool on the selected group of the compute nodes, the system tool operable to monitor execution of the application. Managing system tool operation comprises at least one of distributing, executing, and ending the system tool on one or more compute nodes.