By W Langel; T. Helgaker, P. Jorgensen, J. Olsen, T. Helgaker
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Extra resources for Molecular electronic-structure theory part 1
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A process that wants to UPDATE component i reads the register during slot 2i − 1 and then write backs its contents in the next step, with its new value replacing the old value of component i. Brodsky and Fich [10] show that, with 2m−1 registers, it is possible to improve the UPDATE time to O(log m). The registers are conceptually organized as a strict balanced binary tree, where each of the m leaves contains the value of a different component and, provided no UPDATES are in progress, each internal node contains How Hard Is It to Take a Snapshot?
Similarly, during bottom-write phases, a process performing an UPDATE writes its new value to the bottom-field of the specified component and processes performing SCANS read from the top-fields. This ensures that writes to top-fields don’t interfere with reads from top-fields and writes to bottom-fields don’t interfere with reads from bottom-fields. In addition, each register contains a third field to which processes write when they UPDATE the corresponding component. The information in this field allows a process performing a SCAN to determine whether the top-field or the bottom-field contains the value of the most recent UPDATE to that component.
One of the common issue is having cross-platform starting scripts. The usage of an automated installer tool such as IzPack [5] can accommodate the platform specific discrepancies and prevent the usage of environment variables or manual user configuration which is often error prone and leads to increased support effort. 3 Testing To assess the robustness of an open source software, an extensive regression test suite is needed. Unit testing is now widely available and many tools exist [10] to automate the execution of these tests and generate reports.
Molecular electronic-structure theory part 1 by W Langel; T. Helgaker, P. Jorgensen, J. Olsen, T. Helgaker
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