---------------------------------------------------------------------- H H PPP CCC UK NATIONAL HPC SERVICE H H P P C C -------------------------- HHHHH PPP C x x provided by H H P C C xx EPCC and H H P CCC x x CCLRC Daresbury Laboratory ---------------------------------------------------------------------- HPCx User Mailing 069 6 May 2005 ---------------------------------------------------------------------- Contents ** HPCx life sciences workshop ** Course: Optimisation techniques for the Power4 processor ** Course: Improved performance scaling on HPCx ** ScicomP11: Early registration deadline ** OpenMP: Important information! ---------------------------------------------------------------------- Greetings-- HPCx LIFE SCIENCES WORKSHOP Wednesday 18 May, Rutherford Appleton Laboratory, 13.30 - 17.00 The aim of this workshop is to provide a forum in which to raise issues relating specifically to Life Sciences users of HPCx. Staff from HPCx will give brief talks about the HPCx service, and we also welcome presentations from users. However, the major aim will be to promote an open discussion about the HPCx service. This is an opportunity for Life Sciences users to discuss any problems at all relating to their research work on HPCx, including code performance, availability of software, batch queue configurations and data storage. If you are interested in attending then please email David Henty, d.henty@epcc.ed.ac.uk (HPCx Applications Suport Team Leader). ---------------------------------------------------------------------- COURSE: OPTIMISATION TECHNIQUES FOR THE POWER4 PROCESSOR Thursday 19 May, Rutherford Appleton Laboratory This course will focus on tools and techniques for single processor optimisation on HPCx. The course will cover the architecture of the processors and memory system, profiling and hardware counter tools, getting the best from the compilers and Power4-specific tips and tricks. Further information: http://www.hpcx.ac.uk/support/training/HPCxOpt.html To register, please use the standard form: http://www.hpcx.ac.uk/support/training/form.html How to get to the Rutherford Appleton Laboratory: http://www.cclrc.ac.uk/Activity/RALMaps/ ---------------------------------------------------------------------- COURSE: IMPROVED PERFORMANCE SCALING ON HPCx Friday 20 May, Rutherford Appleton Laboratory This course will focus on tools and techniques for achieving optimal scaling on HPCx. The course will cover techniques for optimising inter and intra-node communication, such as: overlapping communication; cluster aware message passing; mixed mode programming and processor mapping. Further information: http://www.hpcx.ac.uk/support/training/HPCxScale.html To register, please use the standard form: http://www.hpcx.ac.uk/support/training/form.html How to get to the Rutherford Appleton Laboratory: http://www.cclrc.ac.uk/Activity/RALMaps/ ---------------------------------------------------------------------- SCICOMP11: EARLY REGISTRATION DEADLINE ** Deadline for early registration is TOMORROW, 7 May 2005 ** The full programme for ScicomP11, the IBM System Scientific Computing User Group to be held in Edinburgh from 31 May to 3 June, has been finalised. The programme comprises more than 30 talks, includes speakers from both IBM and the scientific user community, and covers a wide range of areas including Blue Gene, large-scale scientific applications, new IBM hardware and software, performance analysis, advanced user tools and parallel libraries. The meeting begins with a one-day tutorial on POWER5 Programming and Optimization. For full details see: www.epcc.ed.ac.uk/scicomp/program.htm The deadline for early registration is tomorrow, Saturday 7 May 2005. It is important to register by this date to qualify for reduced rates and to gain access to our reserved hotel accommodation: Edinburgh can be a busy city during the tourist season. For further information and to register see: www.epcc.ed.ac.uk/scicomp/ ScicomP11 is co-located with the summer meeting of SP-XXL. Members of SP-XXL should register for this meeting via the ScicomP website above. We look forward to meeting you in Edinburgh this summer! The ScicomP11 Organising Committee scicomp@epcc.ed.ac.uk ---------------------------------------------------------------------- OPENMP: IMPORTANT INFORMATION! We strongly recommend the use of the following environment setting when running OpenMP jobs on HPCx: export XLSMPOPTS=spins=0:yields=0 This setting forces the threads to adopt busy-waiting where they keep executing in a tight loop looking for new work instead of going to sleep. Using this setting may significantly improve the performance of some OpenMP codes. There are further details on pages 76-77 of the XL Fortran for AIX: User's Guide: http://www.hpcx.ac.uk/support/documentation/IBMdocuments/sc0949461.pdf Recent changes to the OpenMP runtime library mean that omitting this setting could affect the performance of your code. The HPCx Userguide and example LoadLeveler scripts have been updated to include this new setting. ---------------------------------------------------------------------- Regards --John ---------------------------------------------------------------------- Earlier mailings: http://www.hpcx.ac.uk/support/notices/index.html To be removed from the mailing list: log into your website account, go to the "Update" page, and click the "Opt out of user emails" field; then click "Commit update". -- John Fisher j.fisher@epcc.ed.ac.uk HPCx User Administration and Helpdesk HPCx: http://www.hpcx.ac.uk Helpdesk: support@hpcx.ac.uk Phone: +44 131 650 5029 Fax: +44 131 650 6555