The Development Environment Group (DEG) endeavors to provide a stable, usable, leading-edge parallel application development environment that significantly increases the productivity of LLNL applications developers. We strive to do this by enabling better scalable performance and enhancing the reliability of LLNL applications.

DEG partners with its application development user community to identify user requirements and evaluate tool effectiveness. Through collaborations with vendors and other third party software developers, DEG ensures a complete environment in the most cost effective way possible and meets the needs of today's code developers while steering their code development to exploit emerging technologies.

DEG, part of Livermore Computing (LC), is currently involved in the following projects and activities:

  • Compilers—Compilers for Fortran 90/95, Fortran 77, ANSI C, and C++; details are available about compilers currently installed on LC platforms.
  • Debuggers—See Supported Software and Computing Tools for the available debugging tools, their locations, the machines on which they run, and available documentation (if any).
  • Languages—The primary standardized languages used for scientific computing are Fortran, C, and C++. The international organization responsible for standardization in the field of information technology is the International Organization for Standardization/International Electrotechnical Commission (ISO/IEC). The US counterpart is the International Committee for Information Technology Standards (INCITS). JTC 1, SC 22 manages programming languages, their environments, and system software interfaces.
  • Parallel tools—Tools are provided on most platforms to allow programmers to take advantage of the parallel nature of the machines. MPI is available on all platforms. See Supported Software and Computing Tools for available parallel tools, their locations, the machines on which they run, and available documentation (if any).
  • Performance analysis tools—Various performance analysis tools are available that provide information regarding memory use, hardware counter data, system resource use, and communication. Each tool varies both in ease of use and application perturbation. Several tools provide a GUI for visualization and data reporting. Examination of data is typically done in a postmortem manner; however, some tools have run-time reporting capability. See Supported Software and Computing Tools for available performance analysis tools, their locations, the machines on which they run, and available documentation (if any).
  • Scalable I/O—Providing high performance parallel file system and I/O library support for all major platforms at LLNL, working closely with end users for all parallel I/O issues, performing tests using locally developed tools, and collaborating with platform partners, academic researchers, and vendors to address ASC high performance I/O needs.


Name E-mail ( Assignment/Interests
Scott Futral futral DEG group leader; general environment support, Run/Proxy, findentry, flint
Chris Chambreau chcham Memory, profiling, and MPI tracing tool support, including mpiP, TAU, Vampir/VampirTrace, and memP
Elsa Gonsiorowski gonsie I/O user support and parallel file systems performance, MPI-IO, HDF5, and NetCDF
John Gyllenhaal gyllen Enhancing the CORAL development environment (lrun, lalloc, the srun emulator, wrappers around compilers, bsub, jsrun, etc.), CORAL compiler support, Valgrind/memcheck_all support, debugging strange supercomputer issues
Nathan Hanford hanford1  
Greg Lee lee218 Parallel tool development, Stack Trace Analysis Tool (STAT), Python, Intel software (compilers, Inspector, VTune Amplifier, Advisor, Intel MPI, Trace Analyzer and Collector, and Pin), compilers (PGI), debuggers, PRUNERS tools, and math libraries (MKL, Petsc, and FFTW)
Edgar Leon leon NNSA-CEA TR for Hardware and Software Co-Design, MPI/OpenMP affinity, exascale architectures, and system noise
Nicholas Sly sly1 Full programming environments built via Spack, providing installations of AI/ML software
Local Vendor Support
Max Katz katz12 NVIDIA and GPUs expert
James Lamb lamb28 IBM and GPFS/ESS expert
Roy Musselman musselman4 IBM application analyst, BGQ compiler and MPI support
Flux logo and photos of Dan, Stephen, and Dong

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Comprehensive Livermore Computing machine specifications in a handy, sortable chart.