SimGrid (3.7) NOT RELEASED; urgency=low
- The "Simplicity does not preceed complexity, but follows it" release.
+ The "sprint cleanups (before spring)" release.
Models:
+ * We can specify the smpi latency/bandwidth factor with command line
+ add --cfg=smpi/bw_factor:"threshold0:value0;...;thresholdN:valueN"
+ or add --cfg=smpi/lat_factor:"threshold0:value0;...;thresholdN:valueN"
+ You can also use the "config tag" from platform file by adding this line
+ <prop id="smpi/bw_factor" value="threshold0:value0;...;thresholdN:valueN"></prop>
+ (see "example/platforms/tag_config.xml" to use "config tag").
+ Note that the command line supersedes the platform file configuration.
+ * Change the correction factors used in LMM model, according to
+ the lastest experiments described in INRIA RR-7821.
+ Accuracy should be improved this way.
+ (TODO: this is not true in the code, yet)
* Use the partial invalidation optimization by default for the
network too. Should produce the exact same results, only faster.
+ * Major cleanup in surf to merge models and split some optimization
+ mechanisms from the core of the models. As a result you can now
+ specify which model to use (e.g., --cfg=network/model:LV08
+ --cfg=cpu/model:Cas01) and which optimization mode to use
+ (e.g., --cfg=network/optim:lazy --cfg=cpu/optim:TI).
+ Incompatible combinations should err at initialization. See
+ --help-models for the list of all models and optimization modes.
+ * The CLM03 workstation model were dropped for simplicity because it
+ used the deprecated CM02 network model. Use default instead.
+ * Rename the TCP_gamma configuration option to network/TCP_gamma
+ * Rename the coordinates configuration option to
+ network/coordinates, and document it
+ * Use now crosstraffic keyword instead of the terribly missleading
+ fullduplex keyword. It is activated by default now in the current
+ default model, use --cfg=network/crosstraffic:0 to turn it off.
+ * Experimental: new configuration option --cfg=surf/nthreads:N to run
+ analytical models in parallel with N threads (default is 1).
+ * Ongoing refactoring the model parsing to make XML files optional
+ (more work is needed here to fully achieve this goal)
+
+ MSG:
+ * Deprecate the MSG_task_{get,put} functions and friends.
+ This interface were considered as deprecated since over 2 years,
+ it's time to inform our users that it is.
+ Switch to MSG_task_{send,recv} instead, or declare
+ SIMGRID_DEPRECATED before loading the msg.h if you really need to
+ use these (crappy) functions in your code.
+ These functions will be removed at some point. Stop using them now.
+
+ Simix:
+ * Stabilize the parallel execution mode of user contexts
+ * Introduce configuration variables to control parallel execution:
+ - contexts/synchro: Synchronization mode to use when running
+ contexts in parallel (either futex, posix or busy_wait)
+ - contexts/parallel_threshold: Minimal number of user contexts
+ to be run in parallel (raw contexts only)
+
+ SURF:
+ * Introduce a parallel mode for the models (see surf/nthreads
+ configuration item). In our tests, running the models in parallel
+ never lead to any speadups because they are so fast that the gain
+ of computing each model in parallel does not amortizes the
+ synchronization costs, even when ultra fast futexes are used.
+ This is released anyway because YMMV.
SimDag:
* Performance boost by using a swag internally to compute the set of
tasks that are finished and should constitute the return value of
SD_simulate.
+ SMPI:
+ * Enable it by default now that it is considered rather stable.
+
XBT:
* Mallocators: allow value NULL for the reset function.
* Dicts: new function xbt_dict_new_homogeneous(void(*)(void*)) to
create homogeneous dictionaries, where all the elements share the
- same free function.
+ same free function. Non homogeneous dictionnaries will be
+ deprecated in the next release.
+ * mmalloc module:
+ - cleanups and simplifications to make it maintainable again
+ - exotic features (such as memalign and valloc) were removed
+ - The metadata were extended and improved so that the
+ model-checker becomes able to explore and inspect the heaps.
+ - This may induce a performance drop when enable_model-checking is
+ ON in cmake (even if it's not used in the simulation), but it is
+ necessary at this point to get MC working.
+
+ Turn model-checking OFF if simulation performance matters to you.
-- $date Da SimGrid team <simgrid-devel@lists.gforge.inria.fr>
