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SST V14.0.0 Release Notes

SST V14.0.0 Release Notes
Fixed issues and significant code changes:

General

SST has reintroduced checkpoint/restart support. The implementation in this release is preliminary and has a number of (temporary) limitations which we plan to address in upcoming releases. See the guide here.
- Checkpoint support required that the type for Event::Handler and Clock::Handler functions change. These are deprecated and should be replaced by Event::Handler2 and Clock::Handler2 respectively. In a future release, the Handler type will be changed to match the new Handler2 types. See the checkpointing guide linked above for details.
New libraries mercury, iris, and mask-mpi port the application skeletonization capabilities that SST-Macro provided into the large SST element ecosystem so that it can more easily be used with other element libraries (e.g., merlin network)
An interactive sst-info utility has been released. The utility includes improved search and discovery capabilities. The utility requires that the ncurses.h header be available during compilation. Invoke the utility using sst-info -i. The non-interactive utility is still available using sst-info without the interactive flag.

Deprecation and Removal Notices

Removed previously deprecated functions: Link::sendInitData(), Link::recvInitData(), SimpleNetwork::sendInitData(), SimpleNetwork::recvInitData() and BaseComponent::getSimulation() have been removed. The simulation.h header file is also removed.
- See the new deprecation history page for suggested alternatives
The SST_ELI_REGISTER_SUBCOMPONENT_DERIVED and SST_ELI_REGISTER_MODULE_DERIVED macros are removed
- See the new deprecation history page for suggested alternatives
The SimpleMem interface is removed. Use the StandardMem interface instead.
The Event::Handler and Clock::Handler handler types are deprecated in favor of Event::Handler2 and Clock::Handler2. The new types support checkpoint/restart. See checkpoint guide for details. Eventually the Handler names will be reintroduced to match the new Handler2 types.

SST-Core

Added preliminary checkpoint/restart support. See checkpoint guide for details and check back often for updates.
- Added ability to track pointers to serialization infrastructure
- Added ability to serialize non-pointer variables and also track the address of those variables as a pointer
Added serialization support for SST::RNG, SST::Distrib, SST::SharedObject, std::priority_queue, std::atomic, std::multiset,
Functions in the UnitAlgebra class now throw exceptions instead of causing fatal errors. Not handling the exception will result in a fatal error as before but the exceptions can be handled by calling classes to improve error messages and/or handle the error without a failure.
Fixes to support Python 3.12
Added getSimulationOutput(), getNumRanks, getRank, and getCurrentSimCycle to the StatisticOutput class to replace global accessors previously available through Simulation::getSimulation()
SimpleNetwork
- Deprecated functions recvInitData and sendInitData are removed
- sendUntimedData and recvUntimedData are now pure virtual
Disabled fused floating-point operations under Clang to preserve determinism across platforms
Added information about elements python modules to sst-info output
Added fflush to all TraceFunction output
Removed unused references to SharedRegion
Added interactive sst-info utility
Doxygen documentation updates in several files
Fixed issue when using pushNamePrefix() in python with empty string to eliminate spurious ‘.’ prefixes
Changed python config output to use link name in python instead of link ID based name
Fixed performance issue on Mac where building links in parallel was slow due to high cost of delete.
Added check to main simulation loop to detect time moving backwards or rollover of the 64bit core time counter
Fixed compile error when calling Statistic::addDataNTimes
Added interface for accessing CustomReq/Resp data in StandardMem
Fixed issue where UnitAlgebra objects passed through the python input were rounded
Added functions for pretty-printing UnitAlgebra in python
Fixed formatting in StandardMem toString() functions
Fixed issue where command line options were not overriding options set in the input file

SST-Elements

New libraries iris and mask-mpi added to support mercury
Ariel
- Fixed use after free error in Ariel’s pintool
- Added SIMD width and instruction class info to ariel instructions to fix statistics
Ember
- Added HotSpots motif
Firefly
- Fixed mispelled parameter name in pyfirefly
MemHierarchy
- Added parameter to set noncacheable address ranges - supports multiple coherence domains
- Fixed bug in the directory controller where event was not getting retried
- Bug fixes in MSI protocol
- Fix for prefetch bug that incorrectly counted and dropped prefetches
- Added support for writing out and restoring malloc’d backed memory (supports application checkpointing in Vanadis)
  - Note that full application checkpoint support is not yet functional - pending cache flush updates in the cache models
Merlin
- Fixed network bridge (e.g., for dual-socket configurations)
- Changed merlin python topology builder add network name prefix and enabled building endpoints after network is constructed
- Fixed bug with brodcasts during untimed phases when using a nid map in LinkControl
Vanadis
- Add support for RV64 AMO.OR, AMO.ADD, AMO.XOR, AMO.AND, AMO.MIN, AMO.MAX, MULHSU, FCSR, FSQRT.S, FCVT.S.L, FCVT.WU.S, FCVT.L.S, FMADD.S, FMSUB.S, RDCYCLE (this is not an exhaustive list of newly supported instructions)
- Added VanadisMinInstruction and floating point instruction class (VanadisFPClassInstruction)
- Support for clone syscall in glibc
- Several bug fixes
- Added testing for the riscv-tests suite (https://github.com/riscv/riscv-tests)
- Added support for passing application arguments and environment to Vanadis through environment variables VANADIS_EXE_ARGS and VANADIS_EXE_ENV. Passing as parameters is also supported.
- MVAPICH now works
- Began added application checkpoint support: write/restore of page table and processor state
  - Note that full application checkpoint support is not yet functional - pending cache flush updates in the memHierarchy cache models

SST-Macro

Fixed issues with building under Apple XCode 15
- Note: We continue to encounter occasional bugs when running under various XCode versions.
Minor updates to address compilation warnings and deprecations in SST-Core
Fix to addess segv when printing command line options

Fixed issues and significant code changes:

SST-Core

1085 add missing algorithm include to sstinfo

1082 Fix HDF5 statoutput

1081 Added some of the SImulation API to StatisticOutput base class

1078 Remove deprecated functions and classes

1075 Initial checkpointing support

1074 Disable fused floating-point operations with CLang

1073 Python fix

1072 fix ncurses check to validate the discovered library location

1071 Interactive SST-Info update

1064 Remove Python 2 testing infrastructure

1062 ncurses detection not working on macOS 14

1060 Fix Python 3.12 issues

1052 Update curses detection for Autotools and CMake

1048 Doxygen for UnitAlgebra exceptions

1045 Additional documentation for 6 files

1043 Use exceptions for UnitAlgebra errors

1041 Doxygen Documentation - Small Updates

1037 UnitAlgebra should raise exceptions rather than call abort.fatal

1035 Components having the same class name but in different libraries and elements cannot be loaded

1033 Add interactive SST-info

1032 Fixed some python issues

1029 Time fault

1027 Add SSTConfigVersion.cmake to allow cmake find_package with version

1026 Fix compile error when calling addDataNTimes

1024 Fix issue where python passed rounded UnitAlgebras through parameters

1021 Add interface for accessing CustomReq/Resp data

1020 Fix formatting in stdmem getString functions

1019 Time lord/time vortex discrepency in self created elements

1017 Fixed issue where command line arguments were not overriding options set in input file

1016 Help needed on memory allocation/release scheme for Events

1015 Floating point changes with newer XCode

1012 –print-timing-info does not print timing info when given a json file graph input

1002 Python 3.12 fixes needed

901 Component/SubComponent to MPI rank mappings

860 getTimeLord deprecation warning

SST-Elements

2359 Fix compile warnings (multiple)

2357 cleanup various vanadis warnings (vanadis)

2353 Remove deprecated functions and classes (multiple)

2352 minor fixes to merlin,mercury,mask-mpi (multiple)

2350 testsuite_default_memHierarchy_memHA: convert RE to raw string, PR 2351 (memHierarchy)

2346 Modifying firefly parameters in the configuration file (firefly)

2341 Update futex wake to wake multiple waiters (vanadis)

2339 Python 3.12 fixes required (multiple)

2335 Checkpoint (vanadis)

2331 Checkpoint Vanadis (vanadis, memHierarchy)

2328 set simdoptwidth for ARIEL_START_INSTRUCTION to fix bug with stats (ariel)

2327 Ariel doesn’t count SIMD and scalar instructions properly (ariel)

2324 Weird behavior of EmberAlltoall(v)Motif (ember)

2323 Errors when running ember motifs (ember)

2319 basic_vanadis.py simulation hanging (vanadis)

2315 memH: Fix bug in prefetch logic (memHierarchy)

2313 The control mechanism for the number of prefetch evetns in memHierarchy (variable outstandingPrefetches_) (memHierarchy)

2311 Iris: libfabric builds (iris)

2308 Mercury: fix warnings (mercury)

2306 Merlin python updates (merlin)

2304 Fix issue with mispelled parameter name in pyfirefly (firefly)

2302 Ember: add HotSpots motif (ember)

2300 Add to stats more efficiently in various turnClockOn() functions (memHierarchy)

2297 MemH: Fix a couple bugs in the MSI protocol (memHierarchy)

2293 Compilation error for src/sst/elements/firefly/nic.cc (firefly)

2287 Firefly: Module load failed - pointers for debugging (firefly)

2274 mask-mpi initial commit (mask-mpi)

2294 FIx use after free (ariel)

2291 decode rdcycle (vanadis)

2290 Fix rdma nic lib (rdmaNic)

2289 merlin: fix send queue handling in bridge (merlin)

2286 memH: Updates found when debugging bridge (memHierarchy)

2285 add RISCV suite (vanadis)

2282 Vanadis riscv tests (vanadis)

2280 RISCV tests suite fixes (vanadis)

2034 Using MMIO device with Vanadis (vanadis)

SST-Macro

715 Additional fix for CXX containing flags

714 Make config more resilient to flags being included in CXX

712 Deprecation updates

707 fix segv when printing command line options, addresses issue #706