Charm++ Release 6.6.0

  • Machine target files for Cray XC systems (‘gni-crayxc’) have been added
  • Interoperability with MPI code using native communication interfaces on Blue Gene Q (PAMI) and Cray XE/XK/XC (uGNI) systems, in addition to the universal MPI communication interface
  • Support for partitioned jobs on all machine types, including TCP/IP and IB Verbs networks using ‘netlrts’ and ‘verbs’ machine layers
  • A substantially improved version of our asynchronous library, CkIO, for parallel output of large files
  • Narrowing the circumstances in which the runtime system will send overhead-inducing ReductionStarting messages
  • A new fully distributed load balancing strategy, DistributedLB, that produces high quality results with very low latency
  • An API for applications to feed custom per-object data to specialized load balancing strategies (e.g. physical simulation coordinates)
  • SMP builds on LRTS-based machine layers (pamilrts, gni, mpi, netlrts, verbs) support tracing messages through communication threads
  • Thread affinity mapping with +pemap now supports Intel’s Hyperthreading more conveniently
  • After restarting from a checkpoint, thread affinity will use new+pemap/+commap arguments
  • Queue order randomization options were added to assist in debugging race conditions in application and runtime code
  • The full runtime code and associated libraries can now compile under the C11 and C++11/14 standards.
  • Numerous bug fixes, performance enhancements, and smaller improvements in the provided runtime facilities
  • Deprecations
    • The long-unsupported FEM library has been deprecated in favor of ParFUM
    • The CmiBool typedefs have been deleted, as C++ bool has long been universal
    • Future versions of the runtime system and libraries will require some degree of support for C++11 features from compilers
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