International Business Machines Corporation

Yarden Nir-Buchbinder

Shmuel Ur

Aviad Zlotnick

Orna Raz-Pelleg

Dan S Pelleg

Rachel Tzoref

Eitan D Farchi

Christopher Ward

Brian L Peterson

Daniel Citron

Testing a computer program comprises identification of resource access requests by the computer program to a resource provided by an underlying host. The resource access requests may be intercepted and a determined response may be returned instead of the actual response of the underlying host. In some exemplary embodiments, the resource may a clock of the underlying host and the response may be the time of the clock. In some exemplary embodiments, the computer program may be tested to check for validity during execution on a cloud computing environment, in which access to resources may yield results that on a non-cloud computing environments are generally not expectable. The testing may be performed on a non-cloud computing environments and simulate scenarios applicable to cloud computing environments.

Verification of a computer program in respect to an unexpected response to an access request

A method for software processing includes extracting from software code under test respective items of meta-information pertaining to elements of the software code and receiving respective quality data regarding the elements of software code. The quality data and meta-information are processed in a computer so as to assign respective metrics to the items of the meta-information responsively to the quality data regarding the elements of the software code to which the items pertain. At least some of the meta-information is presented to a user in accordance with the assigned metrics.

Cross-concern code coverage assessment

Detecting locking discipline violations on shared resources. For example, a method of detecting locking discipline violations of shared resources of a computing platform, by a testing process to be executed concurrently with one or more other processes on said computing platform, the testing process comprising: locking a shared resource of said computing platform; reading a value of the shared resource; locally storing the value of the shared resource; rereading the value of the shared resource after a predefined time period; and generating a locking discipline violation report if the value of said shared resource as reread by said rereading is different from the value of said resource as locally stored by said locally storing.

Detecting locking discipline violations on shared resources

A method for providing codebase modification assistance includes receiving training data including learning application code prior to modification and the same learning application code subsequent to modification, the modification being of a known type. Portions of the learning application code that have been changed by the modification are detected. One or more substrings are identified from names associated with the detected portions of the learning application code that have been changed. A target application code that is to be modified according to the known type of modification of the training data is received. The identified one or more substrings are searched for from names associated with portions of the received target application code. The portions of the target application code for which the one or more substrings have been found within associated names are displayed.

Provision of code base modification using automatic learning of code changes

Systems and methods for detecting a potential deadlock in a computing execution environment are provided. A plurality of locks taken during one or more test runs are monitored. A runtime identity and a code location for each of the plurality of locks are identified during each test run. One or more locks among the plurality of locks are classified as same locks based on the runtime identity and code location identified for each lock.

Deadlock detection by lock classification

A method for software processing includes accepting quality information, which includes names of elements of software code and respective quality indications regarding tested acceptability of the elements. The names are processed to extract a list of substrings that occur in the names. Respective metrics are assigned to the substrings responsively to the quality indications of the elements in whose names the substrings occur. At least some of the substrings are presented to a user in accordance with the assigned metrics.

Software quality assessment based on semantic similarities

A method for preventing deadlocks in a multiprocessing environment is provided. The method comprises receiving one or more strongly connected components (SCCs) as input, wherein a first SCC represents a set of locks such that each pair of locks in the set may potentially be involved in a deadlock situation; creating a first gate lock for the first SCC, wherein a first process or process element acquires the first gate lock before acquiring a first lock in the first SCC and releases the first gate lock after releasing a number of locks in the first SCC; and removing the first gate lock, in response to determining that the first gate lock introduces new deadlocks.

Deadlock prevention in a computing environment

The invention provides an improved method for detecting concurrent bugs in multi-threaded software having at least one command to access a non-atomic variable. The non-atomic variable may have a plurality of memory words. In one approach, the method generally involves storing the memory words as atomic variables and replacing the at least one command to access the non-atomic variable with separate instructions to access each of the atomic variables. A thread-switch command is inserted between the atomic variable access commands to increase the likelihood of exposing and detecting synchronization problems.

Growing community of inventors

Haifa, Israel

Yarden Nir-Buchbinder