- 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 option: --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.
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.
