The performance of large‐scale systems must be thoroughly tested under various levels of workload, as load‐related issues can have a disastrous impact on the system. However, load testing often requires a large amount of time, running from hours to even days. In our prior work, we reduced the execution time of a load test by detecting repetitiveness in individual performance metric values, such as CPU utilization, that are observed during the test. However, as we explain in this paper, disregarding combinations of performance metrics may miss important information about the load‐related behavior of a system. In this paper we revisit our prior approach, by proposing an approach that reduces the execution time of a load test by detecting whether a test no longer exercises new combinations of the observed performance metrics. We study three open source systems, in which we use our new and prior approaches to reduce the execution time of a 24‐hour load test. We show that our new approach is capable of reducing the execution time of the test to less than 8.5 hours, while preserving a coverage of at least 95% of the combinations that are observed between the performance metrics during the 24‐hour tests.
During the past decade, artificial intelligence technologies, especially Computer Vision (CV) technologies, have experienced significant breakthroughs due to the development of deep learning models, particularly Convolutional Neural Networks (CNNs). These networks have been utilized in various research applications, including astronomy, marine sciences, security, medicine, and pathology. In this paper, we build a framework utilizing CV technology to support decision-makers during the Hajj season. We collect and process real-time/instant images from multiple aircraft/drones, which follow the pilgrims while they move around the holy sites during Hajj. These images, taken by multiple drones, are processed in two stages. First, we purify the images collected from multiple drones and stitch them, producing one image that captures the whole holy site. Second, the stitched image is processed using a CNN to provide two pieces of information: (1) the number of buses and ambulances; and (2) the estimated count of pilgrims. This information could help decision-makers identify needs for further support during Hajj, such as logistics services, security personnel, and/or ambulances.
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