![]() We present the upgrade to version 2.0 which has a broader scope of interfaced interpolation tools, now providing access to fastNLO. MCgrid is a software package that provides access to interpolation tools for Monte Carlo event generator codes, allowing for the fast and flexible variation of scales, coupling parameters and PDFs in cutting edge leading- and next-to-leading-order QCD calculations. We demonstrate that our prototype's performance is better than comparable systems and comes close to the theoretical lower bound for a log-based transaction manager. We evaluated our prototype and other sys- tems under a variety of workloads. This design is easier to maintain, simpler to integrate into existing OSs, and efficient. We implemented a transactional file API inside the Linux kernel which integrates easily and seamlessly with existing kernel facilities. In this paper we describe our latest prototype and the evo- lution that led to it. Our sec- ond prototype was all in user level, and while it was easier to develop, it suffered from high overheads. Our first prototype was a standalone kernel component within the Linux kernel, but it complicated the kernel considerably and duplicated some of Linux's existing facilities. transactional file access with min- imal impact on existing programs. We explored several tech- niques how to provide. Applications using transactions can become simpler, smaller, easier to develop and maintain, more reliable, and more secure. User applications, however, use a different file- access API (POSIX) which does not offer transactional guarantees. Transactions offer a powerful data-access method used in many databases today trough a specialized query API.
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