The PaCT-2001 (Parallel Computing Technologies) conference was a four-day conference held in Akademgorodok (Novosibirsk), September 3-7, 2001. This was the sixth international conference in the PaCT series, organized in Russia every odd year. The ?rst conference, PaCT-91, was held in Novosibirsk (Academgorodok), September 7-11, 1991. The next PaCT conferences were held in Obninsk (near Moscow), August 30 - September 4, 1993, in St.Petersburg, September 12-15, 1995, in Yaroslavl September 9-12, 1997, and in Pushkin (near St.Petersburg) from September 6-10, 1999. The PaCT proceedings are published by Springer- Verlag in the LNCS series. PaCT-2001 was jointly organized by the Institute of Computational Mat- maticsandMathematicalGeophysicsoftheRussianAcademyofSciences(No- sibirsk), the State University, and the State Technical University of Novosibirsk. 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. - thors from 17 countries submitted 81 papers. Of those submitted, 36 papers were selected for the conference as regular ones, there were also 4 invited - pers. 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.