-\subsection tracing_viva_analysis Viva Visualization Tool
-
-This subsection describe some of the concepts regarding the <a
-href="http://github.com/schnorr/viva/">Viva Visualization Tool</a> and
-its relation with SimGrid traces. You should refer to Viva's website
-for further details on all its visualization techniques.
-
-\subsubsection tracing_viva_time_slice Time Slice
-
-The analysis of a trace file using the tool always takes into account
-the concept of the <em>time-slice</em>. This concept means that what
-is being visualized in the screen is always calculated considering a
-specific time frame, with its beggining and end timestamp. The
-time-slice is configured by the user and can be changed dynamically
-through the window called <em>Time Interval</em> that is opened
-whenever a trace file is being analyzed. Users are capable to select
-the beggining and size of the time slice.
-
-\subsubsection tracing_viva_graph Hierarchical Graph View
-
-As stated above (see section \ref tracing_tracing_analyzing), one
-possibility to analyze SimGrid traces is to use Viva's graph view with
-a graph configuration to customize the graph according to the
-traces. A valid graph configuration (we are using the non-XML <a
-href="http://en.wikipedia.org/wiki/Property_list">Property List
-Format</a> to describe the configuration) can be created for any
-SimGrid-based simulator using the
-<em>--cfg=viva/uncategorized:graph_uncategorized.plist</em> or
-<em>--cfg=viva/categorized:graph_categorized.plist</em> (if the
-simulator defines resource utilization categories) when executing the
-simulation.
-
-\subsubsection basic_conf Basic Graph Configuration
-
-The basic description of the configuration is as follows:
-\verbatim
-{
- node = (LINK, HOST, );
- edge = (HOST-LINK, LINK-HOST, LINK-LINK, );
-\endverbatim
-
-The nodes of the graph will be created based on the <i>node</i>
-parameter, which in this case is the different <em>"HOST"</em>s and
-<em>"LINK"</em>s of the platform used to simulate. The <i>edge</i>
-parameter indicates that the edges of the graph will be created based
-on the <em>"HOST-LINK"</em>s, <em>"LINK-HOST"</em>s, and
-<em>"LINK-LINK"</em>s of the platform. After the definition of these
-two parameters, the configuration must detail how the nodes
-(<em>HOST</em>s and <em>LINK</em>s) should be drawn.
-
-For that, the configuration must have an entry for each of
-the types used. For <em>HOST</em>, as basic configuration, we have:
-
-\verbatim
- HOST = {
- type = square;
- size = power;
- values = (power_used);
- };
-\endverbatim
-
-The parameter <em>size</em> indicates which variable from the trace
-file will be used to define the size of the node HOST in the
-visualization. If the simulation was executed with availability
-traces, the size of the nodes will be changed according to these
-traces. The parameter <em>type</em> indicates which geometrical shape
-will be used to represent HOST, and the <em>values</em> parameter
-indicates which values from the trace will be used to fill the shape.
-
-For <em>LINK</em> we have:
-
-\verbatim
- LINK = {
- type = rhombus;
- size = bandwidth;
- values = (bandwidth_used);
- };
-}
-\endverbatim
-
-The same configuration parameters are used here: <em>type</em> (with a
-rhombus), the <em>size</em> (whose value is from trace's bandwidth
-variable) and the <em>values</em>.
-
-\subsubsection custom_graph Customizing the Graph Representation
-
-Viva is capable to handle a customized graph representation based on
-the variables present in the trace file. In the case of SimGrid, every
-time a category is created for tasks, two variables in the trace file
-are defined: one to indicate node utilization (how much power was used
-by that task category), and another to indicate link utilization (how
-much bandwidth was used by that category). For instance, if the user
-declares a category named <i>request</i>, there will be variables
-named <b>p</b><i>request</i> and a <b>b</b><i>request</i> (<b>p</b>
-for power and <b>b</b> for bandwidth). It is important to notice that
-the variable <i>prequest</i> in this case is only available for HOST,
-and <i>brequest</i> is only available for LINK. <b>Example</b>:
-suppose there are two categories for tasks: request and compute. To
-create a customized graph representation with a proportional
-separation of host and link utilization, use as configuration for HOST
-and LINK this:
-
-\verbatim
- HOST = {
- type = square;
- size = power;
- values = (prequest, pcomputation);
- };
- LINK = {
- type = rhombus;
- size = bandwidth;
- values = (brequest, bcomputation);
- };
-\endverbatim
-
-This configuration enables the analysis of resource utilization by MSG
-tasks through the identification of load-balancing issues and network
-bottlenecks, for instance.
-
