USQCD Software Report Steven Gottlieb Indiana University (MILC & Fermilab Lattice/MILC Collaborations) Fermilab Batavia, IL October 18, 2013
Funding/Personnel ✦ Arizona, Indiana, NCSA, Utah applied to both NSF Physics at the Information Frontier (PIF) program and SciDAC for funding of postdocs to work on software. ✦ DOE and NSF decided they did not like splitting support so, Arizona & Utah are funded by DOE, and NCSA & Indiana are funded by NSF. ✦ Work under PIF was delayed because Guochun Shi left NCSA for Google (just before our funding was assured), and Indiana was not able to hire a postdoc in the first Fall. ✦ NCSA: Nuno Cardoso (Craig Steffen) ✦ Indiana: Mathias Wagner 2 S. Gottlieb, Fermilab, 10-18-13
Performance Modeling ✦ Long history of benchmarking MILC code, mostly in weak scaling mode ✦ For Blue Waters, there was a strong push for performance modeling prior to delivery. I worked on that while on sabbatical at NCSA with Greg Bauer and Torsten Hoefler ✦ Holy grail of performance modeling: • describe hardware (what level?) • predict performance of single and multinode code ✦ Semi-empirical approach • measure single node performance • measure message passing performance 3 S. Gottlieb, Fermilab, 10-18-13
Performance Modeling... ✦ Performance Modeling and Comparative Analysis of the MILC Lattice QCD Application su3_rmd, CCGrid 2012 • prepared in anticipation of IBM Blue Waters • actual Blue Waters is a Cray ✦ Have encouraged Nuno to get involved with this for GPU computing on Blue Waters ✦ He has started with inverter benchmarking • needs more of my attention 4 S. Gottlieb, Fermilab, 10-18-13
SU(3) X U(1) ✦ We have been interested in developing a code with dynamical QED for some time. ✦ Ran Zhou has been working on a reference CPU implementation. • Ran now at Fermilab. ✦ Expect Mathias Wagner to work on GPU implementation. • He has a lot of experience with RHMC code from Bielefeld GPU cluster development. 5 S. Gottlieb, Fermilab, 10-18-13
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