CHAMPAIGN, IL -- The fourth, fifth, and sixth Linux Clusters Institute (LCI) workshops have been scheduled and are now open for registration at the LCI website: http://www.linuxclustersinstitute.org/ . Because demand for the workshops is high and registration is limited to 20 persons per module, early registration is advised. Each hands-on workshop spans a full week and consists of two modules. Partisans are free to attend one or both modules. The first module lasts two days and covers systems administration and management issues related to enhanced security and reliability in high-performance computing. Topics covered include networking, remote administration, job scheduling, account management, security, backup, monitoring tools, and various tools and scripts for common tasks. The second module last three days and is devoted to developing scientific and technical applications and optimizing applications to achieve maximum performance and scalability on Linux clusters of any size. This module addresses topics such as details of the Intel Itanium architecture, memory subsystem and cache tuning, CPU tuning (including SSE/vectorization), multithreaded code optimization, distributed memory optimization using Message Passing Interface (MPI), graphical debugging with TotalView, hardware performance toolkits, MPI tracing tools, and dynamic instrumentation tools. Dates and locations for the upcoming LCI workshops are: *June 10-14, National Center for Supercomputing Applications (NCSA), University of Illinois at Urbana-Champaign. *Aug. 26-30, Doshisha University, Kyoto, Japan. *Sept. 30-Oct. 4 at the High Performance Computing, Education and Research Center (HPCERC), University of New Mexico, Albuquerque. Participants are encouraged to talk about their specific applications and problems at the workshop. Additional information on the workshops, as well as the registration form, is available at the LCI website. The LCI, a consortium that provides advanced technical training for the deployment of high-performance Linux computing clusters, was founded by NCSA, HPCERC, and the Advanced Computing Technology Center at IBM Research. LCI instructors include some of the world's foremost specialists in building and deploying Linux clusters at NCSA, AHPCC, and IBM.