Towards providing low-overhead data race detection for large OpenMP applications

pre-printNeither static nor dynamic data race detection methods, by themselves, have proven to be sufficient for large HPC applications, as they often result in high runtime overheads and/or low race-checking accuracy. While combined static and dynamic approaches can fare better, creating such combinations, in practice, requires attention to many details. Specifically, existing state of the art dynamic race detectors are aimed at low level threading models, and cannot handle high level models such as OpenMP. Further, they do not provide mechanisms by which static analysis methods can target selected regions of code with sufficient precision. In this paper, we present our solutions to both challenges. Specifically, we identify patterns within OpenMP run times that tend to mislead existing dynamic race checkers and provide mechanisms that help establish an explicit happens before relation to prevent such misleading checks. We also implement a fine-grained blacklist mechanism to allow a runtime analyzer to exclude regions of code at line number granularity. We support race checking by adapting Thread Sanitizer, a mature data-race checker developed at Google that is now an integral part of Clang and GCC; and we have implemented our techniques within the state-of-the-art Intel OpenMP Runtime. Our results demonstrate that these techniques can significantly improve run time analysis accuracy and overhead in the context of data race checking of Open MP applications

Deutsch-Slowakischer Sprachkontakt in der Unterzips. Personennamen nach der Überlieferung des 15. und 16. Jahrhunderts im ältesten Stadtbuch von Gelnica/Göllnitz

The author has access to the oldest book of the town of Gelnica (1432- 1605) which is situated in the east Slovakia region (published by Peter Lang, Frankfurt/M. 2002). He discusses names of the late Middle Ages. The article deals with problems of proper names (first names) in a district of the Slovakian-German contact area in the 15. and 16. centuries. It is focused on social problems of the people in later periods, such as a demographic census and plague epidemies