-/*! \page FAQ Frequently Asked Questions
+/*! \page FAQ MSG Frequently Asked Questions
@tableofcontents
+This document is the FAQ of the MSG interface. Some entries are a bit aging and it should be refreshed at some point.
+
\section faq_simgrid I'm new to SimGrid. I have some questions. Where should I start?
You are at the right place... To understand what you can do or
<a href="http://people.irisa.fr/Martin.Quinson/blog/SimGrid/">blog of
Martin Quinson</a>.
-Another great source of inspiration can be found in the \ref msg_examples.
+Another great source of inspiration can be found in the \ref s4u_examples.
If you are stuck at any point and if this FAQ cannot help you, please drop us a
mail to the user mailing list: <simgrid-user@lists.gforge.inria.fr>.
You could use a dictionary (#xbt_dict_t) of dynars (#xbt_dynar_t). If
you still don't see how to do it, please come back to us...
-\subsubsection faq_MIA_asynchronous I want to do asynchronous communications in MSG
-
-You are probably looking for the following functions:
-MSG_task_isend() and MSG_task_irecv();
-MSG_comm_test(), MSG_comm_wait(), MSG_comm_waitall() and MSG_comm_waitany();
-MSG_comm_destroy().
-
-There is even a specific example section on \ref msg_ex_async .
-
\subsubsection faq_MIA_thread_synchronization How to synchronize my user processes?
It depends on why you want to synchronize them. If you just want to
#### The ``<prop/>`` tag ####
Similar to the ``<host>`` tag, a link may also contain the ``<prop/>`` tag; see the host
-documentation (Section \ref pf_host) for an example.
+documentation (Section \ref pf_tag_host) for an example.
\subsubsection pf_backbone <backbone/>
-------------- | --------- | ------ | -----------
id | yes | string | Identifier of this ``storage``; used when referring to it
typeId | yes | string | Here you need to refer to an already existing \ref pf_storage_entity_storage_type "\<storage_type\>"; the storage entity defined by this tag will then inherit the properties defined there.
-attach | yes | string | Name of a host (see Section \ref pf_host) to which this storage is <i>physically</i> attached to (e.g., a hard drive in a computer)
+attach | yes | string | Name of a host (see Section \ref pf_tag_host) to which this storage is <i>physically</i> attached to (e.g., a hard drive in a computer)
content | no | string | When specified, overwrites the content attribute of \ref pf_storage_entity_storage_type "\<storage_type\>"
Here are two examples:
\verbinclude example_filelist_routing_cluster
\anchor pf_routing_model_none
+
### None ###
This model does exactly what it's name advertises: Nothing. There is no routing
uses this model, SimGrid will fail unless you have explicitly activated the
\ref options_model_select_network_constant "Constant Network Model" (this model charges
the same for every single communication). It should
-be noted, however, that you can still attach an \ref pf_tag_asroute "ASroute",
+be noted, however, that you can still attach an \ref pf_tag_zoneroute "ZoneRoute",
as is demonstrated in the example below:
\verbinclude platforms/cluster_and_one_host.xml
\subsubsection pf_tag_zoneroute <zoneRoute>
-The purpose of this entity is to define a route between two ASes.
-This is mainly useful when you're in the \ref pf_routing_model_full "Full routing model".
+The purpose of this entity is to define a route between two
+NetZones. Recall that all zones form a tree, so to connect two
+sibiling zones, you must give such a zoneRoute specifying the source
+and destination zones, along with the gateway in each zone (ie, the
+point to reach within that zone to reach the netzone), and the list of
+links in the ancestor zone to go from one zone to another.
+
+So, to go from an host \c src_host that is within zone \c src, to an
+host \c dst_host that is within \c dst, you need to:
+
+ - move within zone \c src, from \c src_host to the specified \c gw_src;
+ - traverse all links specified by the zoneRoute (they are supposed to be within the common ancestor);
+ - move within zone \c dst, from \c gw_dst to \c dst_host.
#### Attributes ####
\subsubsection pf_tag_route <route>
The principle is the same as for
-\ref pf_tag_zoneroute "ASroute": The route contains a list of links that
+\ref pf_tag_zoneroute "ZoneRoute": The route contains a list of links that
provide a path from \c src to \c dst. Here, \c src and \c dst can both be either a
\ref pf_tag_host "host" or \ref pf_router "router". This is mostly useful for the
\ref pf_routing_model_full "Full routing model" as well as for the
\subsection pf_trace trace and trace_connect
Both tags are an alternate way to pass files containing information on
-availability, state etc. to an entity. (See also, for instance, Section \ref
-pf_host_churn "Churn", as described for the host entity.) Instead of referring
-to the file directly in the host, link, or cluster tag, you proceed by defining
-a trace with an id corresponding to a file, later a host/link/cluster, and
-finally using trace_connect you say that the file trace must be used by the
-entity.
+availability, state etc. to an entity. (See also @ref howto_churn).
+Instead of referring to the file directly in the host, link, or
+cluster tag, you proceed by defining a trace with an id corresponding
+to a file, later a host/link/cluster, and finally using trace_connect
+you say that the file trace must be used by the entity.
#### Example ####
Note that the previous example defines a routing directly between hosts but it could be also used to define a routing between AS.
That is for example what is commonly done when using peers (see Section \ref pf_peer).
-\verbatim
+@verbatim
<?xml version='1.0'?>
<!DOCTYPE platform SYSTEM "http://simgrid.gforge.inria.fr/simgrid.dtd">
<platform version="4">
<peer id="peer-2" coordinates="243.4 58.8 1.4" speed="730Mf" bw_in="13.38MBps" bw_out="1.024MBps" lat="500us" />
</AS>
</platform>
-\endverbatim
+@endverbatim
In such a case though, we connect the AS created by the <b>peer</b> tag with the Vivaldi routing mechanism.
This means that to route between AS1 and AS2, it will use the coordinates of router_AS1 and router_AS2.
This is currently a convention and we may offer to change this convention in the DTD later if needed.
