Patent application number | Description | Published |
20090006064 | Replaying Distributed Systems - Replaying distributed systems involves playing a distributed system in a simulator using data from a real-world operation. In an example embodiment, a simulation process is to simulate a distributed system that has a first instance and a second instance. The simulation process includes a first simulation object corresponding to the first instance and a second simulation object corresponding to the second instance. In another example embodiment, communications between the first instance and the second instance are simulated within the simulation process using function calls between the first simulation object and the second simulation object. | 01-01-2009 |
20090248381 | Predicate Checking for Distributed Systems - Predicate checking in conjunction with distributed systems can enable an investigating user to check predicates in the context of instance states and/or distributed states of a distributed system. In an example embodiment, a method entails accepting distributed system simulation data and performing a simulation of a distributed system using the distributed system simulation data to create distributed system simulated states. At least a portion of the distributed system simulated states are exposed. The exposed portion of the distributed system simulated states is retrieved and stored as exposed states for the distributed system. The exposed states for the distributed system are compared to predicate states for the distributed system. If an inconsistency is detected between the exposed states and the predicate states based on the comparing at least one alarm is issued. | 10-01-2009 |
20090327458 | ONLINE PREDICATE CHECKING FOR DISTRIBUTED SYSTEMS - Exemplary methods, computer-readable media, and systems describe detecting a performance bug or a nontrivial correctness in a distributed system. The techniques describe using an online predicate checker by specifying a predicate on distributed properties of the distributed system. The process describes monitoring and checking the predicate when the system is deployed and providing a service. In response to detection of the performance bug, the process describes performing modifications of the predicate or installing new predicate. | 12-31-2009 |
20090327995 | ANNOTATION-AIDED CODE GENERATION IN LIBRARY-BASED REPLAY - Techniques for automatically generating replay-enabling code in a library based replay system. The technique requires a code template programmed by an operating system developer. Then, utilizing an application programming interface (API) annotation, either standard or user-defined, customized replay-enabled code is automatically generated for every specific API. | 12-31-2009 |
20090328002 | Analysis and Detection of Responsiveness Bugs - Described techniques increase runtime performance of software running in user space by analyzing and detecting soft hang program errors and giving suggestions for cures. This disclosure pertains to techniques for the analysis, detection, and cure of soft hang program errors. | 12-31-2009 |
20090328079 | SPACE SEPARATION FOR A LIBRARY BASED RECORD AND REPLAY TOOL - Techniques for separating application processes into a system space and a replay space are described in a record and replay tool. The technique permits applications to run in the replay space while a record and replay library runs and manages resources in system space ensuring accurate replay of saved data that are used by applications. | 12-31-2009 |
20100125758 | DISTRIBUTED SYSTEM CHECKER - A distributed system checker may check a distributed system against events to detect bugs in the distributed system. The events may include machines crashes, network partitions, and packet losses, for example. The distributed system checker may check a distributed system that can have multiple threads and multiple processes running on multiple nodes. To obtain control over a distributed system, a distributed system checker may insert an interposition layer between a process and the operating system on each node. | 05-20-2010 |
20110178788 | Predicate Checking for Distributed Systems - Predicate checking in conjunction with distributed systems can enable an investigating user to check predicates in the context of instance states and/or distributed states of a distributed system. In an example embodiment, a method entails accepting distributed system simulation data and performing a simulation of a distributed system using the distributed system simulation data to create distributed system simulated states. At least a portion of the distributed system simulated states are exposed. The exposed portion of the distributed system simulated states is retrieved and stored as exposed states for the distributed system. The exposed states for the distributed system are compared to predicate states for the distributed system. If an inconsistency is detected between the exposed states and the predicate states based on the comparing, at least one alarm is issued. | 07-21-2011 |