-SimGrid (3.32.1) not released yet (target december 22)
+SimGrid (3.35.1) not released (target: Feb 24)
+
+
+----------------------------------------------------------------------------
+
+SimGrid (3.35) November 23. 2023
+
+The "Thanks Giving up stateful model-checking" release. Stateless model checking remains.
+
+S4U:
+ - New class ActivitySet to ease wait_any()/test_any()/wait_all()
+ - Deprecate {Comm,Io,Exec}::{wait_any,wait_all,test_any} and friends
+ - Simplify a bit the declaration of multi-zoned platforms from C++
+ - New function NetZone::add_route(host1, host2, links) when you don't need gateways
+ - Also add a variant with s4u::Link, when you don't want to specify the directions
+ on symmetric routes.
+ - Zone's gateways can now be controlled directly.
+ - Add NetZone::add_route(zone1, zone2, links) specifying the route between zones
+ - Introduce a Mailbox::get_async() with no payload parameter. You can use the new
+ Comm::get_payload() once the communication is over to retrieve the payload.
+ - Implement recursive mutexes. Simply pass true to the constructor to get one.
+ - Simplify the expression of horizontal scaling of Tasks.
+ - Each Task now consists of a dispatcher, a collector and one or more instances.
+ - The parallelism degree of each of these can be set.
+ - Several examples have been added or modified accordingly.
+ - Update s4u::create_DAG_from_json() to support wfformat 1.4.
+ - Introduce a new MessageQueue abstraction and associated Mess simulated object.
+ The behavior of a MessageQueue is similar to that of a Mailbox, but intended for
+ control messages that do not incur any simulated cost. Information is automagically
+ transported over thin air between producer and consumer. See examples/cpp/mess-wait
+ - New function: Mutex::get_owner()
+
+S4U plugins:
+ - New: Add a JBOD (just a bunch of disks) concept. It's a sort of host with many disks.
+ - Revamp the battery plugin: rewrite completely the API, for a better usability.
+ The examples were updated accordingly.
+ The battery can now act as a simple connector (see battery-connector example).
+ - Revamp of the photovoltaic plugin: now called SolarPanel and complete rewrite of the API
+ - Add chiller plugin: enable the management of chillers consuming electrical energy
+ to compensate heat generated by hosts.
+ - Add a battery-chiller-solar example combining several plugins to evaluate the amount
+ of brown energy (from the electrical grid) and green energy (from the solar panel)
+ during a given computation.
+
+SMPI:
+ - New SMPI_app_instance_join(): wait for the completion of a started MPI instance
+ - MPI_UNIVERSE_SIZE now initialized to the total amount of hosts in the platform
+ - Memory usage due to SMPI for non-MPI actors greatly reduced.
+ - New implemented calls: MPI_Isendrecv, MPI_Isendrecv_replace
+
+sthread:
+ - Allow to use on valgrind-observed or gdb-observed processes.
+ - Install sthread on user's disk.
+ - Implement recursive pthreads.
+ - Implement pthread_barrier and pthread_cond (but conditional are not supported by the MC yet).
+ - Add some McMini codes to test sthread further (controlled with enable_testsuite_McMini).
+
+Model checking:
+ - Remove stateful model-checking. This was not used, not really working, and very hard to fix.
+ Liveness properties cannot be verified anymore.
+ - More informative backtraces on assertion failure.
+ - Fix dependency bugs for mutex and other transitions
+ - Fix some reversible_race definitions, and also the rest of ODPOR.
+
+Python:
+ - Make the host_load plugin available from Python. See examples/python/plugin-host-load
+ - Mailbox::get_async() does not return a pair anymore. Use comm.get_payload() instead.
+ - Comm::waitall/waitany/testany() are gone. Please use ActivitySet() instead.
+ - Comm::waitallfor() is gone too. Its semantic was unclear on timeout anyway.
+ - Io::waitany() and waitanyfor() are gone. Please use ActivitySet() instead.
+ - Do not export the values of enums. So you need to write e.g. SharingPolicy.LINEAR
+ while it should have been possible to write LINEAR alone before. This is the advised
+ behavior for modern C++ code.
+
+C API:
+ - Introduce sg_activity_set_t and deprecate wait_all/wait_any/test_any for
+ Exec, Io and Comm.
+
+Kernel:
+ - optimize an internal data structure (replace boost::circular_buffer_space_optimized by
+ std::deque to store pending and unmatched Comms in Mailboxes). It is actually a revert
+ to what was used a few years back. The boost structure had a lower memory footprint than
+ deques, but it appeared that their "space_optimized" character was generating a huge lot
+ of refcount changes on the stored Comms.
+
+General:
+ - Fix errors with ns-3 v3.36+
+ - Many other small bug fixes, in particular in MC and sthread.
+
+----------------------------------------------------------------------------
+
+SimGrid (3.34) June 26. 2023
+
+ Save the planet, skip a release: 3.33 was due 6 months ago, so skip directly to 3.34.
General:
- SimGrid now requires a compiler with C++17 support for public headers too.
Comm::set_payload_size() to change the size of the simulated data.
- New function: Engine::flatify_platform(), to get a fully detailed vision of the
configured platform.
+ - New Task abstraction: They are designed to represent dataflows, i.e, graphs of repeatable Activities.
+ See the examples under examples/cpp/task-* and the associated documentation.
- Full simDAG integration: Activity::start() actually starts only when all dependencies
- are fullfiled. If it cannot be started right away, it will start as soon as it becomes
+ are fulfilled. If it cannot be started right away, it will start as soon as it becomes
possible.
- Allow to set a concurrency limit on disks and hosts, as it was already the case for links.
- Rename Link::get_usage() to Link::get_load() for consistency with Host::
- Every signal now come with a static version that is invoked for every object of that class,
- and an instance version that is invoked for this specific object only. For example,
+ and an instance version that is invoked for this specific object only. For example,
s4u::Actor::on_suspend_cb() adds a callback that is invoked for the suspend of any actor while
s4u::Actor::on_this_suspend_cb() adds a callback for this specific actor only.
- Activity::on_suspended_cb() is renamed to Activity::on_suspend_cb(), and fired right before the suspend.
That is, callbacks registered in Exec::on_suspend_cb will not be fired for Comms nor Ios.
New S4U plugins:
- - Task: They are designed to represent dataflows, i.e, graphs of repeatable Activities.
- See the examples under examples/cpp/task-* and the documentation in the Plugins page.
- Battery: Enable the management of batteries on hosts.
See the examples under examples/cpp/battery-* and the documentation in the Plugins page.
- Photovoltaic: Enable the management of photovoltaic panels on hosts.
See the examples under examples/cpp/photovoltaic-* and the documentation in the Plugins page.
Kernel:
- - optimize an internal datastructure (use a set instead of a list for ongoing activities),
+ - optimize an internal data structure (use a set instead of a list for ongoing activities),
leading to a potentially big performance gain, in particular with many detached comms.
MPI:
Models:
- Write the section of the manual about models, at least.
- - WiFi: the total capacity of a link depends on the amout of flows on that link.
+ - WiFi: the total capacity of a link depends on the amount of flows on that link.
- Use the nonlinear callback feature of LMM to reflect this.
- Calibration values can be changed to match different MCS configurations
- See the example teshsuite/models/wifi_usage_decay/wifi_usage_decay.cpp
It requires code annotation, as shown in examples/sthread/stdobject/stdobject.cpp
Model checking:
+ - Stateless model-checking is now usable on any system, including Mac OSX and ARM processors.
+ - The stateless aspects of the MC are now enabled by default in all SimGrid builds.
+ Liveness and stateful aspects are still controlled by the enabling_model-checking
+ configuration option.
+ - Introducing ODPOR and SDPOR reduction strategies
+ - Introducing guiding heuristics, trying to find bugs faster than DFS in reduced state space.
- Synchronize the MBI tests with upstream.
- - Show the full actor bactraces when replaying a MC trace (with model-check/replay)
+ - Show the full actor backtraces when replaying a MC trace (with model-check/replay)
and the status of all actors on deadlocks in MC mode.
- - The safety/stateless aspects of the MC are now enabled by default in all SimGrid builds.
- Liveness and stateful aspects are still controled by the enabling_model-checking
- configuration option.
- - Stateless model-checking is now usable on any system, including Mac OSX and ARM processors.
XBT:
- simgrid::xbt::cmdline and simgrid::xbt::binary_name are gone.
Please use simgrid::s4u::Engine::get_cmdline() instead.
Documentation:
+ - New tutorial on simulating DAGs.
- New section in the user guide on the provided performance models.
- New section presenting some technical good practices for (potential) contributors.
- Add a section on errors and exceptions to the API documentation.
