Abstract: An embodiment of a method of virtualizing a process identifier begins with creation of a child process from a parent process. The parent process creates the child process by making a system call. If the parent process executes before the child process begins to execute, at a kernel level and without interruption the parent process maps a free virtual process identifier to a kernel process identifier for the child process. If the child process executes before the parent process begins to execute, at the kernel level and without interruption the child process determines the kernel process identifier. The child process then maps the free virtual process identifier to the kernel process identifier.

Abstract: Provided are a method, system, and article of manufacture for monitoring patterns of processes accessing addresses in a storage device to determine access parameters to apply. Processes accessing addresses of data in a storage device are monitored. The processes are granted access to the addresses according to first access parameters that indicate how to arbitrate access by processes to the addresses. A condition occurring in response to a pattern of processes accessing addresses is detected. A determination is made of one of the processes in the pattern and the address accessed by the determined process. Indication is made that second access parameters apply for the determined address. The second access parameters are used to grant access to the determined address for subsequent accesses of the indicated address.

Abstract: Provided are a method, system, and article of manufacture for recovery of application faults in a mirrored application environment. Application events are recorded at a primary system executing an instruction for an application. The recorded events are transferred to a buffer. The recorded events are transferred from the buffer to a secondary system, wherein the secondary system implements processes indicated in the recorded events to execute the instructions indicated in the events. An error is detected at the primary system. A determination is made of a primary order in which the events are executed by processes in the primary system. A determination is made of a modified order of the execution of the events comprising a different order of executing the events than the primary order in response to detecting the error. The secondary system processes execute the instructions indicated in the recorded events according to the modified order.

Abstract: Provided are a method, system, and article of manufacture for varying access parameters for processes to access memory addresses in response to detecting a condition related to a pattern of processes access to memory addresses. A monitored condition is detected during application execution. An instrumentation program is invoked to monitor processes accessing data at addresses in a memory device in response to detecting the monitored condition. Information is logged on processes and the addresses they access in the memory device in response to invoking the instrumentation program. The logged information on the processes and the addresses they access is forwarded to an application analysis system in response to detecting a monitored condition during application execution.

Abstract: Provided are a method, system, and article of manufacture for providing a process exclusive access to a page including a memory address to which a lock is granted to the process. A request is received for a memory address in a memory device from a requesting process. A lock is granted to the requested memory address to the requesting process. The requesting process is provided exclusive access to a page including the requested memory address for a page access time period. The exclusive access to the page provided to the requesting process is released in response to an expiration of the page access time period.

Abstract: An embodiment of a method of checkpointing parallel processes in execution within a plurality of process domains begins with a step of setting communication rules to stop communication between the process domains. Each process domain comprises an execution environment at a user level for at least one of the parallel processes. The method continues with a step of checkpointing each process domain and any in-transit messages. The method concludes with a step of resetting the communication rules to allow the communication between the process domains.

Abstract: A method of checkpointing and restarting processes that share a file that is open begins with a step of assigning a priority to one of the processes that share the file. This identifies a priority process. The method concludes with a step of reopening the file when restoring the priority process.

Abstract: A system and method for replication of network state for transparent recovery of network connections are provided. The system and method avoid having to identify and intercept the internal non-deterministic events of a network stack by adopting a state-capture approach. This state-capture approach views the network state of the primary and replica application instances from the viewpoint of an external client. In this way, only network state changes of the primary application instance that are communicated to an external client need to be replicated at the replica application instance. Other network state changes, e.g., internal network state changes, that are not communicated to the external client need not be replicated at the replica application instance. In other words, the illustrative embodiments permit differences in internal network state for those network states that are not made public to the external world, i.e. outside the application instance.

Abstract: A method of restoring processes within a process domain begins with a step of restoring a tree of processes in which at least two of the processes share at least a resource. The method continues with a step of restoring a checkpoint state of each resource used by the processes after a time when a possible need for a restoration state of the resource exists. According to an embodiment, the restoration state comprises information used by the method during the step of restoring the tree of processes. According to another embodiment, the restoration state comprises information used by the method during the step of restoring the checkpoint state of one or more particular resources. The method concludes with a step of resuming execution of each process after restoration of the checkpoint state of the resources used by the process.

Abstract: An embodiment of a method of checkpointing a virtual memory for a process comprises: accessing a page table that correlates logical addresses for the process to physical locations; saving memory resident pages identified for the process from the page table; and saving disk swap pages identified for the process from the page table, the step of saving disk swap pages being performed after the step of saving the memory resident pages.