X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/991c466b8c396e0b8fea7715ddb69d2fbb4daa14..e39b010eca568061812e3981dd439ca98fa0b9b4:/ChangeLog

diff --git a/ChangeLog b/ChangeLog
index 194b7e2c28..1d8b498cc6 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,7 +2,13 @@
 
 SimGrid (3.27.1) NOT RELEASED YET (v3.28 expected June 21. 2021, 03:32 UTC)
 
+New features:
+ - 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: simgrid::s4u::Comm::wait_all_for() (like Comm::Wait_all, but with a timeout).
  - Fixed a bug where Activity::wait_for() killed the activity on timeout.
    Explicitly cancel the activity to get back to previous behavior.
 
@@ -10,10 +16,64 @@ 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
 
 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().
+
+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.
+
 XBT:
  - xbt_assert is not disabled anymore, even when built with enable_debug=off.
 
@@ -25,6 +85,8 @@ Fixed bugs (FG#.. -> FramaGit bugs; FG!.. -> FG merge requests)
  - 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
 
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