SimGrid (3.25.1) UNRELEASED (target: March 20 2020 or v3.26 on 3/26/20)
Important user-visible changes:
+ - SimGrid now requires a compiler with C++14 support.
+ Sibling projects should upgrade their FindSimgrid.cmake
- Surf precision default value is now 1e-9, instead of 1e-5. This was changed as
several users had difficult to understand issues when using high bandwidth or
small latency events. The new value was already the default for SMPI and
timings if simulation was skipping a lot of small events (which was actually
an issue of said simulation). The value can still be changed back using
--cfg=surf/precision:1e-5.
+ - On some network models (L07, CM02, LV08), an implicit loopback link is created
+ for local communication. Default bandwidth was 500MBps and latency was 15µs,
+ which was rather bad. Default values have been changed to 10GBps and 0 latency.
+ Options network/loopback-lat and network/loopback-bw have been added to adapt
+ these values if needed. Network and routing models already providing separate
+ loopbacks (clusters and such) are not impacted by this change.
+ - SMPI now adds 16 bytes of header to each message sent, in order to simulate
+ metadata that are added to each MPI message by MPI libraries (tag,
+ src/dest, and communicator information). This may change simulation times
+ for very small message sizes, but should be more realistic.
+
+New features:
+ - New routing 'WiFi' that makes it easier to specify a wifi network zone.
+ - New plugins: wifi_energy and link_load. See the associated examples.
+ - New examples: wifi networks, and communication suspend.
General:
- LTO is now enabled for Intel/clang compilers.
- LTO behavior on GCC can be parameterized using LTO_EXTRA_FLAG in cmake.
Setting it to "auto" will use all available cores, while setting it to n will
use n cores to speedup link step (usage: cmake -DLTO_EXTRA_FLAG=4).
+ - Remove obsolete option --cfg=contexts/parallel-threshold.
+ - Further improve the documentation.
-C interface:
+S4U:
+ - the on_exit() of each actor is also executed when the simulation deadlocks.
+ - New functions: s4u::Activity:: suspend(), resume() and is_suspended()
+ An example is provided for s4u::Comm but it should work with Exec and Io.
+
+SMPI:
+ - Update proxy apps coverage of new ECP apps: 60+ apps now tested nightly on
+ https://framagit.org/simgrid/SMPI-proxy-apps
+ - MPI/IO: supports names starting with "./"
+ - Fortran: many MPI/IO bindings, support for MPI_UB/LB, C MPI_INT/FLOAT/DOUBLE
+ datatypes.
+ - smpicc/cxx/ff/f90 now will actually perform definition checks at link time. When
+ building shared libraries, this may cause issues, so environment variable
+ SMPI_NO_UNDEFINED_CHECK can be added to disable this.
+
+C binding and interface:
+ - The return type of the sg_actor_on_exit() callbacks is now 'void'
+ (int value was previously ignored)
+ - Many C functions were renamed to follow a common naming style
+ (sg_object_get_something and sg_object_set_something). As usual, the deprecated
+ names are kept until version 3.30.
- Many MSG tests were converted to the new S4U's interface in C, that
was extended for that.
-Fixed bugs (FG#.. -> framagit bugs; FG!.. -> framagit merge requests):
+Fixed bugs (FG#.. -> FramaGit bugs; FG!.. -> FG merge requests)
+ (FG: issues on Framagit; GF: issues on GForge; GH: issues on GitHub)
- FG#41: Add sg_actor_create C interface
- FG#43: xbt::random needs some care
- FG#48: The Impossible Did Happen (yet again)
+ - FG#50: Suspending an actor executed at the current timestamp fails
+ - FG#52: Zero-seconds timeout : "That's in the past already"
+ - FG#53: Crash while using ns-3 network model
+ - FG#54: How to suspend a comm?
+ - FG!22: Stochastic Profiles
- FG!24: Documentation and fix for xbt/random
+ - FG!35: Add a modeling hint for parallel links in doc
+ - FG!36: [xbt/random] Read/Write the state of the RNG
+ - FG!42: Link cumulated load plugin
+ - FG!44: Test condition variable wait_until+notify_all
+ - GF#18137: Allow different stack sizes?
+ - GH#128: Parallelization of simulation with --cfg=contexts/nthreads
- GH#139: Allow pthread creation in SMPI
+ - GH#336: Packet-level simulation using SMPI?
+ - GH#345: Error in the LMM while migrating a VM
+ - GH#346: [SMPI] error while loading shared libraries: libsimgrid.so
+ - GH#352: pip install / python setup.py install fail to find pybind11
+ - GH!337: Fix link_energy plugin for wifi platforms
+ - GH!339: Add Mailbox set_receiver method to python binding
+ - GH!344: Cast hugepages macros parameters to int64
----------------------------------------------------------------------------
(documenting all internals this way is overkill + doxygen scales badly)
- New tutorial on S4U (highly inspired from the old MSG one, but with
a git repository to fork as a starting point, and a docker image)
- - Started but not finished a SMPI tutorial inspired from the JLPC'14 one.
+ - Started but not finished an SMPI tutorial inspired from the JLPC'14 one.
- The Developper manual is still to be converted (not compiled until then)
- Some parts are still missing in this conversion (such as the
platform and deployment sections) while others were blindly converted
- Rename Energy plugin into host_energy
- Rename Load plugin into host_load
-simix:
+Simix:
- Add parameter --cfg=simix/breakpoint to raise a SIGTRAP at given time.
- kill simix::onDeadlock() that was somewhat dupplicating s4u::on_deadlock()
- Improve performance when handling timeouts of simix synchros.
* This is (mainly) a backward compatible change: v4 are valid v4.1 files
- <zone> can be used as a synonym for the now deprecated <as>
- <zoneRoute> can be used as a synonym for the now deprecated <asroute>
- - <bypassZoneRoute> an be used as a synonym for the now deprecated <bypassAsRoute>
+ - <bypassZoneRoute> can be used as a synonym for the now deprecated <bypassAsRoute>
- <actor> can be used as a synonym for the now deprecated <process>
- state_file and avail_file periodicity is now easier to express
(check the documentation) the old behavior should still work.
TRACE:
* Two new tracing options for adding comments to trace file so you
can track your experiments (see --help-tracing for details).
- * New option to generate a impoverished trace file (--cfg=tracing/basic:1)
+ * New option to generate an impoverished trace file (--cfg=tracing/basic:1)
* Adding the SimGrid version that generated the trace file as a comment.
* Instrumenting other MSG functions (MSG_task_isend_with_matching and MSG_task_dsend)
* Fix to avoid key clashes on Paje links
MSG but a few things really had to disappear. The main differences
with the previous version are:
1) no more m_links_t and the corresponding functions. Platforms are
- directly read from a XML description and cannot be hard-coded
+ directly read from an XML description and cannot be hard-coded
anymore. The same format is used for application deployment
description. The new format is described in the documentation.
Have a look in tools/platform_generation. There is a tiny script
