Milc with Scidac c carleton DeTar



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MILC with SciDAC C

  • Carleton DeTar

  • HackLatt 2008


SciDAC Software Team







SciDAC/C Tutorial 2007

  • James Osborn and Andrew Pochinski

  • http://web.mit.edu/~bgl/scidac-2007/



New: Installation qinstall

  • CVSROOT = :pserver:anonymous@cvs.jlab.org:/group/lattice/cvsroot

  • cvs -d $CVSROOT co -P qinstall

  • Profile for each processor type



Level 1

  • QMP (message passing)

    • MPI
    • QCDOC
  • QLA (single-processor linear algebra)

    • Some 25,000 Perl-generated routines
    • in a couple dozen libraries


Level 2

  • QIO (file I/O)

    • USQCD file formats
    • ILDG file formats
    • Create your own format
    • LIME (message encapsulation – tar-like)
  • QDP (data parallel operations)



Example of QDP coding

  • Plaquette calculation





QDP/C vs QDP++

  • Procedure calls straightfoward but cumbersome

  • Optimization inherited from QLA

  • Proliferation of precompiled procedures



Level 3

  • QOP (inverters, Dslash, fermion force)

  • Can be implemented in assembly





MILC Makefile Options for SciDAC



Summary



Tutorial 2 goals

  • Build MILC code with SciDAC support

  • Create a gauge file in SciDAC format

  • Learn how to use qinstall




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