with a call to \ref MSG_mailbox_set_async . For MSG, all messages sent to this
mailbox will have this behavior, so consider using two mailboxes if needed.
+This value needs to be smaller than or equals to the threshold set at
+\ref options_model_smpi_detached , because asynchronous messages are
+meant to be detached as well.
+
\subsubsection options_pls Configuring packet-level pseudo-models
When using the packet-level pseudo-models, several specific
- Any SimGrid-based simulator (MSG, SimDag, SMPI, ...) and raw traces:
\verbatim
---cfg=tracing:1 --cfg=tracing/uncategorized:1 --cfg=triva/uncategorized:uncat.plist
+--cfg=tracing:yes --cfg=tracing/uncategorized:yes --cfg=triva/uncategorized:uncat.plist
\endverbatim
The first parameter activates the tracing subsystem, the second
tells it to trace host and link utilization (without any
- MSG or SimDag-based simulator and categorized traces (you need to declare categories and classify your tasks according to them)
\verbatim
---cfg=tracing:1 --cfg=tracing/categorized:1 --cfg=triva/categorized:cat.plist
+--cfg=tracing:yes --cfg=tracing/categorized:yes --cfg=triva/categorized:cat.plist
\endverbatim
The first parameter activates the tracing subsystem, the second
tells it to trace host and link categorized utilization and the
smpirun -trace ...
\endverbatim
The <i>-trace</i> parameter for the smpirun script runs the
-simulation with --cfg=tracing:1 and --cfg=tracing/smpi:1. Check the
+simulation with --cfg=tracing:yes and --cfg=tracing/smpi:yes. Check the
smpirun's <i>-help</i> parameter for additional tracing options.
Sometimes you might want to put additional information on the trace to
Please, use these two parameters (for comments) to make reproducible
simulations. For additional details about this and all tracing
-options, check See the \ref tracing_tracing_options "Tracing
-Configuration Options subsection".
+options, check See the \ref tracing_tracing_options.
\section options_smpi Configuring SMPI
Simulation time: 1e3 seconds.
\endverbatim
+\subsection options_model_smpi_detached Simulating MPI detached send
+
+(this configuration item is experimental and may change or disapear)
+
+This threshold specifies the size in bytes under which the send will return
+immediately. This is different from the threshold detailed in \ref options_model_network_asyncsend
+because the message is not effectively sent when the send is posted. SMPI still waits for the
+correspondant receive to be posted to perform the communication operation. This threshold can be set
+by changing the \b smpi/send_is_detached item. The default value is 65536.
+
+\subsection options_model_smpi_collectives Simulating MPI collective algorithms
+
+SMPI implements more than 100 different algorithms for MPI collective communication, to accurately
+simulate the behavior of most of the existing MPI libraries. The \b smpi/coll_selector item can be used
+ to use the decision logic of either OpenMPI or MPICH libraries (values: ompi or mpich, by default SMPI
+uses naive version of collective operations). Each collective operation can be manually selected with a
+\b smpi/collective_name:algo_name. Available algorithms are listed in \ref SMPI_collective_algorithms .
+
\section options_generic Configuring other aspects of SimGrid
\subsection options_generic_path XML file inclusion path
- \c smpi/display_timing: \ref options_smpi_timing
- \c smpi/cpu_threshold: \ref options_smpi_bench
- \c smpi/async_small_thres: \ref options_model_network_asyncsend
+- \c smpi/send_is_detached: \ref options_model_smpi_detached
+- \c smpi/coll_selector: \ref options_model_smpi_collectives
- \c path: \ref options_generic_path
- \c verbose-exit: \ref options_generic_exit
