{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,9,25]],"date-time":"2025-09-25T18:16:38Z","timestamp":1758824198856,"version":"3.38.0"},"reference-count":20,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2009,2,1]],"date-time":"2009-02-01T00:00:00Z","timestamp":1233446400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The International Journal of High Performance Computing Applications"],"published-print":{"date-parts":[[2009,2]]},"abstract":"<jats:p> Modeling and analysis techniques are used to investigate the performance of a massively parallel version of DIRECT, a global search algorithm widely used in multidisciplinary design optimization applications. Several high-dimensional benchmark functions and real world problems are used to test the design effectiveness under various problem structures. In this second part of a two-part work, theoretical and experimental results are compared for two parallel clusters with different system scales and network connectivities. The first part studied performance sensitivity to important parameters for problem configurations and parallel schemes, using performance metrics such as memory usage, load balancing, and parallel efficiency. Here linear regression models are used to characterize two major overhead sources, interprocessor communication and processor idleness, and also applied to the isoefficiency functions in scalability analysis. For a variety of high-dimensional problems and large-scale systems, the massively parallel design has achieved reasonable performance. The results of the performance study provide guidance for efficient problem and scheme configuration. More importantly, the design considerations and analysis techniques generalize to the transformation of other global search algorithms into effective large-scale parallel optimization tools. <\/jats:p>","DOI":"10.1177\/1094342008098463","type":"journal-article","created":{"date-parts":[[2009,2,18]],"date-time":"2009-02-18T16:25:41Z","timestamp":1234974341000},"page":"29-41","source":"Crossref","is-referenced-by-count":21,"title":["Performance Modeling and Analysis of a Massively Parallel Direct\u2014Part 2"],"prefix":"10.1177","volume":"23","author":[{"family":"Jian He","sequence":"first","affiliation":[{"name":"DEPARTMENT OF COMPUTER SCIENCE, VIRGINIA POLYTECHNIC\rINSTITUTE AND STATE UNIVERSITY,"}]},{"given":"Alex","family":"Verstak","sequence":"additional","affiliation":[{"name":"DEPARTMENT OF COMPUTER SCIENCE, VIRGINIA POLYTECHNIC\rINSTITUTE AND STATE UNIVERSITY"}]},{"given":"M.","family":"Sosonkina","sequence":"additional","affiliation":[{"name":"AMES LABORATORY, IOWA STATE UNIVERSITY"}]},{"given":"L.T.","family":"Watson","sequence":"additional","affiliation":[{"name":"DEPARTMENT OF MATHEMATICS, VIRGINIA POLYTECHNIC INSTITUTE\rAND STATE UNIVERSITY"}]}],"member":"179","published-online":{"date-parts":[[2009,2,1]]},"reference":[{"key":"atypb1","doi-asserted-by":"publisher","DOI":"10.1109\/40.342015"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1007\/978-3-540-39924-7_41"},{"volume-title":"Introductory Statistics with R","year":"2002","author":"Dalgaard, P.","key":"atypb3"},{"volume-title":"Proceedings of Dagstuhl Seminar: Symbolic Algebraic Methods and Verification Methods, Lecture Notes in Computer Science","author":"Decker, T.","key":"atypb4"},{"key":"atypb5","volume-title":"Introduction to Parallel Computing","author":"Grama, A.","year":"2003","edition":"2"},{"volume-title":"Performance modeling and analysis of a massively parallel DIRECT-Part 1. 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