PaCT-2003 (Parallel Computing Technologies) conference was a four-day conference held in Nizhni Novgorod on September 15 - 19, 2003. This was the seventh international conference of PaCT series, which are organized in Russia every odd year.

      The first, PaCT-91, conference was held in Novosibirsk (Academgorodok), September 7 - 11, 1991. The next PaCT conferences were held in Obninsk (near Moscow), 30 August - 4 September, 1993; in St.Petersburg, September 12 - 15, 1995; in Yaroslavl 9-12 September, 1997; in Pushkin (near St.Petersburg) from 6 till 10 September, 1999; and in Akademgorodok (Novosibirsk), September 3 - 7, 2001. The PaCT Proceedings are published by Spring Verlag in the LNCS series.

      PaCT-2003 was jointly organized by the Institute of Computational Mathematics and Mathematical Geophysics of the Russian Academy of Sciences (Novosibirsk) and the State University of Nizhni Novgorod.

      The purpose of the conference was to bring together scientists working with theory, architecture, software, hardware and solution of large-scale problems in order to provide integrated discussions on Parallel Computing Technologies. The conference attracted about 100 participants from around the world. Authors from 23 countries submitted 78 papers. Of those submitted, 38 papers were selected for the conference as regular ones; there were also 4 invited papers. In addition there were a number of posters presented. All the papers were internationally reviewed by at least three referees. As usual a demo session was organized for the participants.

      Many thanks to our sponsors: the Russian Academy of Sciences, the Russian Fund for Basic Research, the Russian State Committee of Higher Education, IBM and Intel (Intel laboratory in Nizhny Novgorod) for their financial support. Organizers highly appreciate the help of the Association Antenne-Provence (France).