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<HTML><HEAD><TITLE>GVU: PVaniM -- Visualization/Animation in Cluster Environments</TITLE></HEAD><BODY BGCOLOR="#ffffff" ><MAP NAME="MINI3MAP"><AREA SHAPE="RECT" COORDS="0,0,70,16" HREF="/gvu/lab"><AREA SHAPE="RECT" COORDS="71,0,140,16" HREF="/gvu/people"><AREA SHAPE="RECT" COORDS="141,0,210,16" HREF="/gvu/info/aboutthegvu.html"></MAP><TABLE WIDTH=550 BORDER=0 CELLSPACING=0 CELLPADDING=0><!- This looks horrible but it's necessary so that you don't get extra spaces in the bars. 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You can start editing again !><TR><TD COLSPAN=2 ALIGN=RIGHT VALIGN=CENTER><H2>PVaniM -- Visualization/Animation<BR> in Cluster Environments</H2></TD></TR></TABLE><TABLE WIDTH=550 BORDER=0 CELLSPACING=0 CELLPADDING=0><TR><TD><HR>PVaniM is an enhancement package for PVM 3.3 that producesanimations of the execution of PVM applications. This documentdescribes the subsystem that shows fine-grained post-mortemvisualizations of PVM applications. Another subsystem, <!WA9><AHREF="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanimOL/pvanimOL.html">PVaniM 2.0</A> provides on-line,low-overhead, minimal perturbation visualizations as well.<P>PVaniM provides a general purpose set of views that work with all PVMapplications, and provides support for users to build customapplication specific animations. The two main components of PVaniMare a tracing library and a general purpose set of animations thatwork with all PVM applications.<P>The PVaniM system provides its own robust tracing package for PVM. Thispackage not only drives the general purpose animations, but also providessupport for user trace events for use with custom application specific animations. The PVaniM tracing package provides comprehensivetimestamping techniques. PVaniM not only performs clocksynchronization and tachyon removal for its ``wall clock'' timestamp,but it also provides a pure Lamport logical timestamp as an aid indetermining the concurrency and causality of events that take place inthe application. <P>The second main component of PVaniM is a general purpose library ofanimations that work with all PVM applications. This library wasdeveloped using the <!WA10><A HREF="http://www.cc.gatech.edu/gvu/softviz/parviz/polka.html">the POLKA Animation Designer's Package</A>, and users may also use this package to developtheir own application specific animations.Included below are snapshots from the PVaniM system.<P>All of the PVaniM system is available via anonymous FTP from <!WA11><A HREF="ftp://ftp.cc.gatech.edu/pub/people/stasko"><CODE>ftp.cc.gatech.edu</CODE></A> under <CODE>pub/people/stasko</CODE>.The support platform required for this is a machine running the XWindow System with Motif, and a C++ compiler. From the FTP sitementioned above, you will need to retrieve the files<CODE>pvanimtrace.tar.Z</CODE> and<CODE>pvanimviz.tar.Z</CODE>.<HR><!WA12><A HREF="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanim/pvanim3win.gif"><!WA13><IMG SRC="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanim/pvanim3win.icon.gif"></A>When users begin a session with PVaniM, they are presented with the PVaniMMenu, an Information Box, and a Polka Control Panel.The PVaniM Information Box displays message communication information that can be acquired by clicking with the left mouse button on objects in some of the views. ThePolka Control panel allows you to change the speed of the animation, step through it, or pause the animation. The PVaniM Menu displays the general purpose views that are currently available.<P><!WA14><A HREF="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanim/pvanimhist.gif"><!WA15><IMG SRC="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanim/pvanimhist.icon.gif"></A>The History view is the first option available in the PVaniM menu. This scrolling view maintains a history of messagesthat have been sent or received. The Y-axis of this view is labeled withLamport clock values with time proceeding from bottom to top. The X-axis is labeled with process identifiers. Squares that are associated with messagesends are filled in with dark colors. Lighter colors of the same hue fill squares that are associated with the corresponding message receives. Message size is encoded by filling squareswith various amounts of color. This can be deciphered by using theHistory Legend view, the second option listed in the PVaniM Menu.<P><!WA16><A HREF="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanim/pvanimcaus.gif"><!WA17><IMG SRC="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanim/pvanimcaus.icon.gif"></A> The third option available in the PVaniM Menu is the Causality View.This view is a more complex version of a Feynman diagram, and is alsoknown to many as a Lamport timeline view.In this view, the Y-axis is labeled with process identifiers and the X-axis is labeled with Lamportclock values. When a message is sent, a circle appears at the appropriate logical time coordinate. Varying circle radii are used to denote message size and the color of thecircle is the same as that used in the history view. When a message is delivered, an arrow ``grows'' from the coordinate of where the messagewas sent to the correct Lamport delivery time on the receiver's timeline.Simultaneously, the circle representing the message moves along this pathand then disappears. Arrows may be clicked by the users with the left mousebutton. This will place in the PVaniM Information Box pertinent dataregarding the arrow (which represents a message communication) such as whosent the message, who received it, its type and length. This view is similar to the history view in the information it provides, but is very useful when trying to distinguish communication patterns.<P><!WA18><A HREF="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanim/pvanimmp.gif"><!WA19><IMG SRC="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanim/pvanimmp.icon.gif"></A>The fourth option available in the PVaniM Menu is the Message Passing view.In this view, all the processes are laid out around the outside circle. Messages are represented as circles that smoothly move into the center of the ring of processeswhen sent near and end up in the vicinity of the process that the message isintended to be received by. At any time messages may be clicked by the user with the left mouse button. In the PVaniM Information Box will appear data such as who sent the message, who received it, its type and length.When a process receives a message, the message moves from itsposition in the center of the ring to the process. The color of the messageis the same color as used in the history view. Contrail lines are provided so that it is clear where the message came from. The user may turn theselines off if the view becomes too cluttered by clicking on the ``lines off''button provided in the inside of the Message Passing View. Further,the radius of the circles representing messages is proportionalto message size. Messages that are never delivered conspicuously remainin the center. Also, the smooth animation of message traffic helps portray actions such as message broadcasts.<P><!WA20><A HREF="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanim/pvanimgt.gif"><!WA21><IMG SRC="http://www.cc.gatech.edu/gvu/softviz/parviz/pvanim/pvanimgt.icon.gif"></A>The fifth and final option available is the Gant view. This is a famousParaGraph view where each process is represented as being computing,sending a message, or receiving a message. When a message is computing,a green line is drawn, when it is sending a message, a yellow line is drawn,and when it is receiving, a red line is drawn. This is a simplistic versionof the ParaGraph view as it automatically provides a time scaling such thatthe entire view fits in the Gant window.<HR><!WA22><A HREF=http://www.cc.gatech.edu/gvu/softviz> Back to Software Visualization Home Page</A><HR><SMALL>Questions or comments? Email <!WA23><A HREF="mailto:gvu-webmaster@cc.gatech.edu">gvu-webmaster@cc.gatech.edu</A>.</SMALL></TD></TR></TABLE></BODY></HTML>⌨️ 快捷键说明
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