X-Git-Url: http://info.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/blobdiff_plain/e474b7f1374fa1ec39d4c5fc32a47baf4db3ded4..5d3cc4fa4b1428899a036b2a7c2b9c038673ed4d:/ChangeLog

diff --git a/ChangeLog b/ChangeLog
index c48206465c..f9f388319d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,8 +3,8 @@
 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 
+ - 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:
@@ -15,10 +15,44 @@ 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.
 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.
 
@@ -30,7 +64,8 @@ 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#68: Tutorial misleading users of pre-v3.26 versions of SimGrid
+ - 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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