----------------------------------------------------------------------------
-SimGrid (3.25.1) UNRELEASED (target: March 20 2020 or v3.26 on 3/26/20)
+SimGrid (3.27.1) NOT RELEASED YET (v3.28 expected June 21. 2021, 03:32 UTC)
+
+S4U:
+ - Fixed a bug where Activity::wait_for() killed the activity on timeout.
+ Explicitly cancel the activity to get back to previous behavior.
+
+SMPI:
+ - The default SMPI compiler flags are no more taken from the environment.
+ They can be explicitly set through cmake parameters SMPI_C_FLAGS,
+ SMPI_CXX_FLAGS, or SMPI_Fortran_FLAGS.
+
+LUA:
+ - Lua platform files are deprecated. Their support will be dropped after v3.31.
+
+XBT:
+ - xbt_assert is not disabled anymore, even when built with enable_debug=off.
+
+Documentation:
+ - New tutorial: Model-checking and formal assessment
+
+Fixed bugs (FG#.. -> FramaGit bugs; FG!.. -> FG merge requests)
+ (FG: issues on Framagit; GF: issues on GForge; GH: issues on GitHub)
+ - FG#47: Complete and fix tests from teshuite/s4u/activity-lifecycle
+ - FG#64: Configuring smpi/IB-penalty-factors
+ - FG#67: Running computation concurrently with MPI_Iallreduce
+ - GH#322: Issue when an actor kills his host vm
+
+----------------------------------------------------------------------------
+
+SimGrid (3.27) March 29. 2021
+
+The Ragnar Release (anniversary of the siege of Paris by Vikings in 845)
+
+Main user-visible changes:
+ - All functions marked as deprecated for one year were removed.
+ - Removed all that was related to the "Storage" type in all APIs and bindings.
+ "Disks" have been introduced more than a year ago to replace them for the better.
+ It's time to finish this replacement.
+ - SMPI ABI breaks from previous version: MPI global handles (predefined datatypes,
+ ops, COMM_WORLD) are now defined differently, and can be used in initializers,
+ avoiding "initializer element is not constant" errors with some codes. Please be
+ careful to recompile your MPI codes if switching to this new SimGrid version.
+ - Network model ns-3 now requires version ns-3.28 or higher.
+ - Removed some option aliases that were deprecated since v3.23 (June 2019)
+ - 'verbose-exit' is now 'debug/verbose-exit'
+ - 'simix/breakpoint' is now 'debug/breakpoint'
+ - 'clean-atexit' is now 'debug/clean-atexit'
+
+S4U:
+ - New functions: Comm::sendto_{init,async} to initiate a communication
+ on between two (possibly remote) hosts.
+ - Define new template functions Mailbox::get_unique(), returning a std::unique_ptr.
+ - Functions Mailbox::get() and Mailbox::get_async() are now templated with the
+ type of the pointee. Untyped functions are deprecated. Use Mailbox::get<void>()
+ or Mailbox::get_async<void>() if you really want to play with void*.
+ - Unify the interface of Activity::on_{start/activity}
+ - New function: Comm::get_dst_data()
+ - New function: Comm::set_payload_size() to set the amount of bytes to simulate.
+
+Models:
+ - ptask should now work better with multicore hosts (FG#37).
+ - Internal cleanups and refactoring around activities, to prepare for SimDAG++.
+ - Internal cleanups and refactoring around models, to prepare for programmatic
+ platform creation.
+ - Modernize our tests of the performance models
+
+Documentation:
+ - User manual:
+ - New section: Configuring the logs from the command line.
+ - New section: Programming API of logs.
+ - New section: Getting realistic results
+ - New section: Examples of SMPI Usage
+ - New part: SimGrid's Internals, with a section on Design goals
+ - Move back to the classical Breathe tool chain, and fix many small glitches.
+
+SMPI:
+ - Handle leak checking: SMPI will now display a message if MPI handles are still
+ present at the end of a simulation. Option smpi/list-leaks:n will display the n
+ first leaked pointers and their types.
+ - smpi/display-allocs option : Display Memory allocations analysis, with hints
+ about the largest allocations. This only works for allocations with malloc/calloc
+ and not compiled with SMPI_NO_OVERRIDE_MALLOC
+ - "-analyze" option in smpirun will activate smpi/display-allocs and smpi/display-timing
+ - New implemented MPI calls: MPI_File_set_size, MPI_Aint_add, MPI_Aint_diff,
+ MPI_Type_get_extent_x, MPI_Type_get_true_extent_x, MPI_Status_set_elements_x
+ - Support for MPI C++ datatypes (MPI_CXX_BOOL, MPI_CXX_FLOAT_COMPLEX,
+ MPI_CXX_DOUBLE_COMPLEX, MPI_CXX_LONG_DOUBLE_COMPLEX)
+ - Replay now opens and parses the trace file only once for all ranks when possible.
+ - Misc fixes:
+ - better handling of MPI_PROC_NULL
+ - MPI_Group_incl was broken in some cases
+ - PAPI tracing now fixed
+ - MPI_Errhandlers are properly handled for MPI_COMM_WORLD
+ - SMPI will now fail properly when receive size < sent size, instead of
+ just setting MPI_ERR_TRUNCATE and keep going.
+ - Proxy Apps ( https://framagit.org/simgrid/SMPI-proxy-apps ):
+ - Remove useless build patches and split build/run patches on the page
+ - Build in parallel when possible
+ - Test on yum-based systems
+ - New nightly tested Proxy-apps:
+ - OpenMPI mpi-test-suite
+ - Coral MCB, LSMS, Qbox, CLOMP
+ - ECP/Mantevo Cloverleaf3D, Ember
+ - Codevault bhtree_mpi
+
+Model checker:
+ - Only initialize the Dwarf parser when needed, saving 10 seconds in most cases.
+ - Start to overhaul the implementation to modernize it (still ongoing).
+
+XBT:
+ - Drop simgrid::xbt::demangle(). Please use boost::core::demangle() instead.
+ - Drop xbt_dynar_cursor_rm(), xbt_dynar_search_or_negative(),
+ xbt_str_split_quoted(), xbt_str_split_quoted_in_place().
+ - Deprecate xbt_dynar_to_array().
+ - When an exception occurs in kernel mode, display both the actor and kernel stacks.
+
+C binding and interface:
+ - Rename (lowercase) functions sg_actor_get_PID, sg_actor_get_PPID, sg_actor_by_PID.
+ - Constness requirement has been lowered for parameter argv of sg_actor_start()
+ and sg_actor_create() It's now (char* const*). The previous version is still
+ available as sg_actor_start_() and sg_actor_create_().
+
+Fixed bugs (FG#.. -> FramaGit bugs; FG!.. -> FG merge requests)
+ (FG: issues on Framagit; GF: issues on GForge; GH: issues on GitHub)
+ - FG#37: Parallel tasks are limited to 1 core per host
+ - FG#62: Running "smpirun -replay" on large networks
+ - FG!46: Fix a few potential memory leaks in SMPI colls
+ - GH#343: Wrong consumed energy when an exec timeouts
+
+----------------------------------------------------------------------------
+
+SimGrid (3.26) December 15. 2020
+
+The Release release (the French lockdown was eased today).
Important user-visible changes:
- SimGrid now requires a compiler with C++14 support.
Sibling projects should upgrade their FindSimgrid.cmake
- Surf precision default value is now 1e-9, instead of 1e-5. This was changed as
- several users had difficult to understand issues when using high bandwidth or
+ several users had difficulties to understand issues when using high bandwidth or
small latency events. The new value was already the default for SMPI and
should not cause too much performance hit. It can change some simulation
timings if simulation was skipping a lot of small events (which was actually
- an issue of said simulation). The value can still be changed back using
- --cfg=surf/precision:1e-5.
+ an issue per see). The old value can be restored with --cfg=surf/precision:1e-5.
- On some network models (L07, CM02, LV08), an implicit loopback link is created
for local communication. Default bandwidth was 500MBps and latency was 15µs,
which was rather bad. Default values have been changed to 10GBps and 0 latency.
- LTO behavior on GCC can be parameterized using LTO_EXTRA_FLAG in cmake.
Setting it to "auto" will use all available cores, while setting it to n will
use n cores to speedup link step (usage: cmake -DLTO_EXTRA_FLAG=4).
- - Remove obsolete option --cfg=contexts/parallel-threshold.
+ - Remove obsolete runtime option 'contexts/parallel-threshold'.
+ - Runtime option 'tracing/msg/process' renamed to 'tracing/actor'. The old name
+ has been kept for compatibility.
+ - Finally remove obsolete snake_case() aliases for runtime options.
- Further improve the documentation.
S4U:
- smpicc/cxx/ff/f90 now will actually perform definition checks at link time. When
building shared libraries, this may cause issues, so environment variable
SMPI_NO_UNDEFINED_CHECK can be added to disable this.
+ - most temporary files should now be created in /tmp dir (or equivalent).
+ If this one does not allow execution of code (noexec flag), this may cause issues.
+ Please use another tmp directory (using TMPDIR or equivalent system variable)
+ in this case.
+
+Model-Checker:
+ - A large refactoring is ongoing, but this should be transparent for users so far.
+
+XBT:
+ - Drop xbt_str_split().
C binding and interface:
- The return type of the sg_actor_on_exit() callbacks is now 'void'
allocations' size above which they are considered "shared" by default (as if
they were performed through SMPI_SHARED_MALLOC macros).
Default = 0 = disabled feature.
- Note : malloc, calloc and free are now overriden by smpicc/cxx by default.
+ Note : malloc, calloc and free are now overridden by smpicc/cxx by default.
This can cause some troubles if codes are already overriding these. If this
is the case, defining SMPI_NO_OVERRIDE_MALLOC in the compilation flags can
help, but will make this feature unusable.
