----------------------------------------------------------------------------
-SimGrid (3.25.1) UNRELEASED (target: March 20 2020 or v3.26 on 3/26/20)
+SimGrid (3.28.1) NOT RELEASED YET (v3.29 expected September 22. 2021, 19:21 UTC)
+
+New modeling features:
+ - Non-linear resource sharing for decay models:
+ - The total capacity may depend on the number of concurrent usages
+ - For that, resources can take a callback that computes the capacity
+ depending on the idle capacity and the number of concurrent usages
+ - Examples (both cpp and python): io-degradation, network-nonlinear, exec-cpu-nonlinear
+
+ - Dynamic factors for CPU and disk: similarly to dynamic network factors,
+ allows the user to set a callback which can affect the progress of activities
+ (multiplicative factor applied when updating the amount of work remaining).
+ - Example: examples/cpp/exec-cpu-factors
+
+Python:
+ - Added support to programmatic platform creation in Python.
+ Example: examples/python/clusters-multicpu
+
+S4U:
+ - Disk and Host now have a set_sharing_policy() too, for non-linear sharing.
+ This can only be set through the API, not through XML files.
+
+SMPI:
+ - TI Tracing/Replay:
+ - Multiple fixes to ensure reproducibility of tracing
+ - scan/excan can now be replayed
+ - wait action now uses ranks and not pid, as the other ones.
+ - smpi/init and smpi/finalization-barrier are now valid for replays.
+
+Documentation:
+ * New section "Release Notes" documenting recent and current developments.
+ * New section "Modeling I/O: the realistic way" presenting how to properly model disks in SimGrid.
+ * Improvements in API Reference for C++ and Python interfaces.
+
+ns-3 model:
+ - Make wifi creation compatible with ns-3 version 3.34 too.
+
+Fixed bugs (FG#.. -> FramaGit bugs; FG!.. -> FG merge requests)
+ (FG: issues on Framagit; GF: issues on GForge; GH: issues on GitHub)
+ - FG#78: Multiple fixes for SMPI replay:
+ - TI tracing of allotallv/w was outputting wrong values
+ - MPI_LOGICAL in fortran is actually 32 bits wide, and not 8.
+ - FG#77: Search feature of doc is broken (update sphinx theme version)
+----------------------------------------------------------------------------
+
+SimGrid (3.28) July 14. 2021
+
+The Victoriadagarna Release.
+
+New features:
+ - C++ platform interface: Users can now describe their platform directly in C++.
+ This provides greatly flexibility and performance improvement for complex
+ platforms. Main features:
+ - Fat-Tree/DragonFly/Torus composing: allows you to create clusters of
+ "zones", instead of single hosts. This feature enables the description
+ of clusters with complex hosts, composed of several CPUs, GPUs, etc.
+ - StarZone: new zone with a Star-like topology. The routes are defined
+ as a set of links used to communicate from node to everybody (node<->ALL).
+ - Split-Duplex links: auxiliary method to create split-duplex links in
+ the platform, easing its utilisation. It automatically creates both UP
+ and DOWN links (similarly as done in XML).
+ - Please refer to the documentation and the examples included:
+ e.g. examples/cpp/clusters-multicpu/ and examples/platforms/*.cpp.
+ - New plugin: Producer-Consumer with monitor. Just requires to include the
+ include/simgrid/plugins/ProducerConsumer.hpp header to be used. See the
+ associated example (examples/cpp/plugin-prodcons).
+
+S4U:
+ - New: s4u::Comm::wait_all_for() (like s4u::Comm::wait_all, but with a timeout),
+ s4u::Io::wait_any(), s4u::Io::wait_any_for().
+ - Methods test_all/test_any/wait_all/wait_any in s4u now take their vector
+ parameter by reference, instead of a pointer.
+ - Fixed a bug where Activity::wait_for() killed the activity on timeout.
+ Explicitly cancel the activity to get back to previous behavior.
+ - New: Link::set_concurrency_limit() to limit the amount of concurrent flows.
+
+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.
+ - New options:
+ --cfg=smpi/finalization-barrier: which can be used to add
+ a barrier inside MPI_Finalize. This can help for some codes which cleanup
+ data attached to a process, but still used in other SMPI processes.
+ --cfg=smpi/errors-are-fatal: True by default, behaves like if MPI_ERRORS_RETURN
+ is active when set to false, to keep going after a small error
+ --cfg=smpi/pedantic: True by default. Do not report some harmless MPI errors
+ which may or may not be problematic in the end.
+ - Sampling:
+ - fix behaviour, as maximum iteration count could be ignored
+ - add SMPI_SAMPLE_LOCAL_TAG and SMPI_SAMPLE_GLOBAL_TAG macros, to allow user to
+ use sampling when the same kernel is called with a different set of parameters
+ which have an impact on the timing.
+ - realloc is now intercepted, to be coherent, as malloc/calloc/free were already.
+ It should now work with smpi/auto-shared-malloc-thresh.
+ - Improve error handling and reporting in multiple places
+ - Improve correctness checks on the MPI code.(MPI_Op and MPI_Datatype
+ validity checks, truncated messages are now an error, return errors
+ when explicitely deleted handles are reused, ...)
+ - RMA: multiple fixes and stability improvements.
+ - analysis (-analyze flag in smpirun):
+ - SMPI can now report buffer leaks as well as MPI handles leaks,
+ if code was compiled without SMPI_NO_OVERRIDE_MALLOC.
+ - if -trace-call-location is used when compiling, SMPI can report
+ origin of leaked handles/buffers
+ - group leaks by type/origin in output message if possible
+ - New implemented MPI calls: MPI_Comm_test_inter
+
+Models:
+ - Changed internal implementation of bandwidth factors in network models.
+ Models affected: CM02, LV08 (default), SMPI, IB.
+ Configuration affected: "network/bandwidth-factors" and "smpi/bw-factors".
+ Bandwidth factors are applied to communications to describe that users
+ cannot use 100% of the available bandwidth. For example, the default network model,
+ LV08, applies a factor of 0.97 to the bandwidth. In older versions, this
+ behavior was implemented by limiting the bandwidth available in the LMM
+ system for this flow. This may give the false impression that there is
+ bandwidth available for other flows due to its underutilization, especially
+ for the dynamic bandwidth factors used in SMPI models.
+ To avoid this, we have modified the implementation so that each flow uses the
+ maximum physical bandwidth according to the LMM system.
+ However, the actual throughput of the flow seen by the user is defined by
+ the physical bandwidth multiplied by the bandwidth factor.
+ This change impacts on the simulation results for all network models on
+ which we have bandwidth factors configured.
+ *****************************************
+ *DO NOT MIX 3.28 RESULTS WITH OLDER ONES*
+ *****************************************
+ This change may impact on the timing of your simulation results.
+ Take care when comparing simulations from different SimGrid's
+ versions. Sorry for the inconvenience.
+ - Dynamic network factors: users can configure a callback to define
+ the network factors dynamically. This API is available at
+ simgrid::kernel::resource::NetworkModelIntf.
+ - Users have access to complete information about the current communication
+ to decide which factor to apply. This includes: message size, source and
+ destination hosts, links and zones traversed.
+ - Dynamic factors for both latency and bandwidth.
+ - For more details, see the example in (examples/cpp/network-factors).
+ - Plugin host_energy: the "watt_off" and "watt_per_state" host properties,
+ deprecated since version 3.24, are no longer supported. Instead, use
+ "wattage_off" and "wattage_per_state".
+
+XBT:
+ - xbt_assert is not disabled anymore, even when built with enable_debug=off.
+
+Documentation:
+ - New tutorial: Model-checking and formal assessment
+ - New sections: "Demystifying the routing" and "C++ platforms"
+ - Update and improve the part on visualization in MPI and Algo tutorials.
+ - Improve the section on routing: how to define it, how it's used internally
+ - Fix many issues, broken links and missing references in doxygen and Sphinx
+
+LUA:
+ - Lua platform files are deprecated. Their support will be dropped after v3.31.
+
+Simix:
+ - Legacy functions deprecated in this release: SIMIX_get_clock(), SIMIX_run().
+
+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
+ - FG#69: Tutorial misleading users of pre-v3.26 versions of SimGrid
+ - FG#71: Segmentation fault on invalid gw_src/gw_dst
+ - 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'
- GH#336: Packet-level simulation using SMPI?
- GH#345: Error in the LMM while migrating a VM
- GH#346: [SMPI] error while loading shared libraries: libsimgrid.so
+ - GH#352: pip install / python setup.py install fail to find pybind11
- GH!337: Fix link_energy plugin for wifi platforms
- GH!339: Add Mailbox set_receiver method to python binding
- GH!344: Cast hugepages macros parameters to int64
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.
