archman updates

diff --git a/doc/archman.bib b/doc/archman.bib
new file mode 100644 (file)
index 0000000..b0433e1
--- /dev/null
+++ b/doc/archman.bib
@@ -0,0 +1,9 @@
+\bibitem{ies02}
+  Sutherland, Ivan, {\it UCB-IES02: Fleet -- A One Instruction Computer }\\
+  \href{http://research.cs.berkeley.edu/class/fleet/docs/people/ivan.e.sutherland/ies02-FLEET-A.Once.Instruction.Computer.pdf}
+\bibitem{ies14}
+  Sutherland, Ivan, {\it UCB-IES14: The Fleet Definition}\\
+  \href{http://research.cs.berkeley.edu/class/fleet/docs/people/ivan.e.sutherland/ies14-Fleet.Definition.pdf}
+\bibitem{ies44}
+  Sutherland, Ivan, {\it UCB-IES44: The Fleet Definition}\\
+  \href{http://research.cs.berkeley.edu/class/fleet/docs/people/ivan.e.sutherland/ies44-Fleet.Definition.pdf}

diff --git a/doc/archman.tex b/doc/archman.tex
index 5d79cc8..c969280 100644 (file)
--- a/doc/archman.tex
+++ b/doc/archman.tex
@@ -1,63 +1,147 @@
-\documentclass[10pt,oneside]{book}
+\documentclass[10pt,oneside]{article}

 \reversemarginpar 
 \usepackage{palatino}
 \usepackage{epsfig}
 \reversemarginpar 
 \usepackage{palatino}
 \usepackage{epsfig}

+\usepackage{verbatim}

 \usepackage{parskip}
 \usepackage{register}
 \usepackage{bytefield}
 \usepackage{parskip}
 \usepackage{register}
 \usepackage{bytefield}

+\usepackage[colorlinks=true, pdfstartview=FitV, linkcolor=blue, citecolor=blue, urlcolor=blue]{hyperref}

 \renewcommand{\ttdefault}{cmtt}
 \renewcommand{\ttdefault}{cmtt}

-\title{The FleetTwo Architecture Manual}
+\title{The FleetTwo Architecture Manual\\{\normalsize A Programmer's View of Fleet}}

 \begin{document}
 \maketitle
 \begin{document}
 \maketitle

+
+\begin{thebibliography}{[GDG01]}
+\bibitem[IES02]{ies02}
+  Sutherland, Ivan,
+  \href{http://research.cs.berkeley.edu/class/fleet/docs/people/ivan.e.sutherland/ies02-FLEET-A.Once.Instruction.Computer.pdf}{\it UCB-IES02: Fleet -- A One Instruction Computer}
+\bibitem[IES14]{ies14}
+  Sutherland, Ivan,
+  \href{http://research.cs.berkeley.edu/class/fleet/docs/people/ivan.e.sutherland/ies14-Fleet.Definition.pdf}{\it UCB-IES14: The Fleet Definition}
+\bibitem[IES44]{ies44}
+  Sutherland, Ivan,
+  \href{http://research.cs.berkeley.edu/class/fleet/docs/people/ivan.e.sutherland/ies44-Fleet.Definition.pdf}{\it UCB-IES44: The Fleet Definition}
+\end{thebibliography}
+
+\vspace{3cm}
+\begin{abstract}
+This manual attempts to detail all those aspects of Fleet which are
+visible to a software programmer or compiler backend.
+
+This document assumes that the reader is broadly familiar with the
+Fleet architecture and the motivation behind it.  For a far better
+introduction to these topics, the reader is referred to \cite{ies02}
+\cite{ies14} and \cite{ies44}.  Please bear in mind that many of the
+details in these documents have been changed, but they still serve as
+the authoritative introduction to the architecture.  After reviewing
+these introductory papers, the reader is invited to digest this
+architecture manual for the latest information on the details
+necessary to write software and compilers for Fleet.
+\end{abstract}
+
+

 \pagebreak
 \pagebreak

-\section*{Glossary}
+\section*{Introduction (from \cite{ies02})}
+
+In \cite{ies02}, Sutherland writes:
+
+{\it
+When computers were new, logic and storage were expensive and wires
+were relatively cheap.  Early computer designers avoided using logic
+wherever possible but were not greatly concerned with communication.
+They made design choices consistent with the costs of the day.  My
+favorite example is the jump instruction.  Early designers put jump
+instructions at the end of each block of code to avoid the expense of
+storing the address of the next block while executing the present one.
+
+Today's chip fabrication methods invert the older cost balance.  In
+today's integrated circuits logic and memory are now almost free but
+communication costs dominate chip area, energy consumption and delay.
+In spite of these changes in the stuff from which we make computers,
+vestiges of the past remain in many of today's common microprocessor
+designs.  For example, jump instructions still appear at the end of
+each basic block of code in spite of the need to pre-fetch the next
+block while executing this one.  It seems better today to store a
+pointer to the next block and the length of the current block early in
+each block of code.
+
+Instead of following the path of history, I'd like to listen carefully
+to what modern chip structures have to teach about how one might build
+a modern computer.  I see three major lessons.  First, simplicity can
+reduce cost.  Second, moving data will consume most of the time,
+energy and chip area of a modern computer. And third, the low cost of
+logic makes concurrency available if we can figure out how to use it.
+
+\begin{itemize}
+
+\item {\bf Simplicity}: The Fleet architecture seeks simplicity by treating
+      all processing devices alike...
+
+\item {\bf Communication}: The Fleet architecture seeks to control the
+      cost of communication by putting it under direct programmer
+      control.  Thus Fleet avoids instructions like {\sc ADD} or {\sc STORE} that
+      include concealed communication to and from a register file...

 
 

-Port\\
-Inlet\\
-Outlet\\
-Pump\\
-Packet\\
-Data Item\\
-Opcode Port\\
-Bypass\\
+\item {\bf Concurrency}: The Fleet architecture assumes concurrency
+      nearly everywhere...
+
+\item {\bf Asynchrony}: This provides enormous flexibility for
+      implementers to improve the performance or reduce the cost of
+      the processing devices in a Fleet system.  -- Synchronous
+      implementations both of ships and of the switch fabric are
+      possible provided they use validity or occupancy bits to achieve
+      the arbitrary delays required at sources and destinations...
+
+\end{itemize}
+}

 
 
 \pagebreak
 
 
 \pagebreak

-\section*{Programmer's View of The Ship-Fabric Interface}
+\section*{The Programmer's View of The Ship-Fabric Interface}

 
 

-The diagram below represents a {\it programmer's} conceptual view of
-the interface between ships and the switch fabric.  Actual
-implementations may differ radically, as long as such differences are
-not visible to software programs.
+The role of the Fleet switch fabric is to carry {\it packets} from
+{\it sources} to {\it destinations}.

 
 

-%\begin{wrapfigure}{R}{2in}
-\epsfig{file=ports,width=6in}
-%\end{wrapfigure}
+A packet consists of a {\it path} and a {\it payload}.  The path is
+some string of bits which tells the switch fabric how to route from
+the desired source to the desired destination.  The distinction
+between a {\it path} and a {\it destination} is extremely important!
+The payload is either a {\it token} or a {\it data item}.  If the
+payload is a data item, it includes one machine word of data.

 
 

-The term {\it port} refers to each interface to the ship (either
-inbound or outbound) and the machinery required to manage this
-interface.  The machinery consists of a {\it latch}, which is as wide
-as a single machine word, a {\it pump}, which is a circular fifo of
-instruction-width latches, and a number of {\it sources} or {\it
-  destinations}.  Sources and destinations which can only send or
-recieve tokens (rather than data items) are drawn as dashed lines.
-Buffering fifos are drawn where they appear.
+The diagram below represents a {\it programmer's} conceptual view of
+the interface between ships and the switch fabric.  Actual
+implementation circuitry may differ substantially.  Sources and
+destinations which can send and recieve only tokens -- not data items
+-- are drawn as dashed lines.

 
 

-Note in particular that every pump is a destination capable of
-recieving a data word.  This is how instructions are dispatched to
-pumps -- they are inserted into the switch fabric as {\it packets}
-whose destination addresses
+\vspace{0.3cm}
+\begin{center}
+\epsfig{file=ports,width=4in}
+\end{center}
+\vspace{0.3cm}

 
 

-Note that addresses are actually paths.
+The term {\it port} refers to each interface to the ship, the {\it
+  valve} connecting it to the switch fabric, and the corresponding
+sources and destinations on the switch fabric.

 
 

-Define packets.
+Each valve consists of a {\it data latch}, which is as wide as a
+single machine word and a {\it pump}, which is a circular fifo of
+instruction-width latches.  The contents of the instruction fifo
+control the data latch, as future chapters will explain.

 
 

+Note that the pump in each valve has a destination of its own, and
+that there is no buffering fifo guarding this destination.  Note that
+all other destinations are guarded by a buffering fifo; the size of
+this fifo is exposed to the software programmer so she can ensure that
+deadlock does not occur.

 
 
 \pagebreak
 \section*{Data Formats}
 
 
 
 \pagebreak
 \section*{Data Formats}
 

-\subsection*{Packet Destination Address (12 bits)}
+\subsection*{Packet Path (12 bits)}

 
 These bits appear physically within the switch fabric, and have
 ``address bit timing.''  The {\tt T} bit is the ``tokenhood'' bit; if
 
 These bits appear physically within the switch fabric, and have
 ``address bit timing.''  The {\tt T} bit is the ``tokenhood'' bit; if

@@ -68,16 +152,14 @@ fabric data latches to fire.
 \begin{bytefield}{49}
   \bitheader[b]{37,47,48}\\
   \bitbox{1}{T} 
 \begin{bytefield}{49}
   \bitheader[b]{37,47,48}\\
   \bitbox{1}{T} 

-  \bitbox{11}{Destination Address} 
+  \bitbox{11}{Path} 

   \bitbox[l]{37}{} 
 \end{bytefield}
 }
 
 \subsection*{Data Word In Memory (37 bits)}
 
   \bitbox[l]{37}{} 
 \end{bytefield}
 }
 
 \subsection*{Data Word In Memory (37 bits)}
 

-A word of memory is 37 bits wide.  For convenience, we assume that the
-memory word width is also the width of a pointer as well as the width
-of all on-chip data item registers.
+A word of data is 37 bits wide.

 
 {\tt\footnotesize
 \begin{bytefield}{49}
 
 {\tt\footnotesize
 \begin{bytefield}{49}

@@ -87,16 +169,13 @@ of all on-chip data item registers.
 \end{bytefield}
 }
 
 \end{bytefield}
 }
 

-\subsection*{Data Packet In Flight (49 bits)}
-
-A {\it data packet} is a data item in the switch fabric, on its way to
-some destination.
+\subsection*{Packet In Flight (49 bits)}

 
 {\tt\footnotesize
 \begin{bytefield}{49}
   \bitheader[b]{0,36,37,47,48}\\
   \bitbox{1}{T} 
 
 {\tt\footnotesize
 \begin{bytefield}{49}
   \bitheader[b]{0,36,37,47,48}\\
   \bitbox{1}{T} 

-  \bitbox{11}{Destination Address} 
+  \bitbox{11}{Packet Path} 

   \bitbox{37}{Data Word} 
 \end{bytefield}
 }
   \bitbox{37}{Data Word} 
 \end{bytefield}
 }

@@ -104,13 +183,17 @@ some destination.
 \subsection*{Instruction In Memory (37 bits)}
 
 An instruction must be no wider than a memory word.  The next section
 \subsection*{Instruction In Memory (37 bits)}
 
 An instruction must be no wider than a memory word.  The next section

-explains the bits in greater detail.
+explains the bits in greater detail.  The {\tt Instruction Path} is
+the path which the instruction itself will take in order to arrive at
+the desired pump destination.  The {\it Data/Token Path} is placed on
+any packet inserted into the switch fabric as a result of executing
+the instruction.

 
 {\tt\tiny
 \begin{bytefield}{49}
   \bitheader[b]{0,10,11,17,18-26,36}\\
   \bitbox[r]{12}{}
 
 {\tt\tiny
 \begin{bytefield}{49}
   \bitheader[b]{0,10,11,17,18-26,36}\\
   \bitbox[r]{12}{}

-  \bitbox{11}{Instruction Register Address} 
+  \bitbox{11}{Instruction Path}

   \bitbox{1}{K} 
   \bitbox{1}{L} 
   \bitbox{1}{Ti} 
   \bitbox{1}{K} 
   \bitbox{1}{L} 
   \bitbox{1}{Ti} 

@@ -120,22 +203,22 @@ explains the bits in greater detail.
   \bitbox{1}{To} 
   \bitbox{1}{Rq} 
   \bitbox{7}{Count} 
   \bitbox{1}{To} 
   \bitbox{1}{Rq} 
   \bitbox{7}{Count} 

-  \bitbox{11}{Data/Token Destination} 
+  \bitbox{11}{Data/Token Path}

 \end{bytefield}
 }
 
 \subsection*{Instruction Packet In Flight (49 bits)}
 
 \end{bytefield}
 }
 
 \subsection*{Instruction Packet In Flight (49 bits)}
 

-A {\it instruction packet} is an instruction in the instruction horn
-(which may or may not be the same thing as the data horn), on its way
-to some instruction register (Valve).
+Note that Fleet simply copies the {\tt Instruction Path} field, bit
+for bit, into the packet {\tt Path} field in order to ``dispatch'' an
+instruction.

 
 {\tt\tiny
 \begin{bytefield}{49}
   \bitheader[b]{0,10,11,17,18-25,37,47,48}\\
   \bitbox[r]{1}{0} 
 
 {\tt\tiny
 \begin{bytefield}{49}
   \bitheader[b]{0,10,11,17,18-25,37,47,48}\\
   \bitbox[r]{1}{0} 

-  \bitbox{11}{Instruction Register Address} 
-  \bitbox[lr]{11}{}
+  \bitbox{11}{Instruction Path}
+  \bitbox{11}{Instruction Path}

   \bitbox{1}{K} 
   \bitbox{1}{L} 
   \bitbox{1}{Ti} 
   \bitbox{1}{K} 
   \bitbox{1}{L} 
   \bitbox{1}{Ti} 

@@ -145,7 +228,7 @@ to some instruction register (Valve).
   \bitbox{1}{To} 
   \bitbox{1}{Rq} 
   \bitbox{7}{Count} 
   \bitbox{1}{To} 
   \bitbox{1}{Rq} 
   \bitbox{7}{Count} 

-  \bitbox{11}{Data/Token Destination} 
+  \bitbox{11}{Data/Token Path}

 \end{bytefield}
 }
 
 \end{bytefield}
 }
 

@@ -321,7 +404,31 @@ Note how a ``standing'' instruction is encoded as {\tt Count=1111111}
 \end{itemize}
 
 \pagebreak
 \end{itemize}
 
 \pagebreak

-\section{Future Directions}
+\section*{Fleet Assembly Language}
+
+The Fleet Assembly language is designed to be a human-readable
+depiction of the bits which comprise a Fleet program.  The formal
+syntax is given below:
+
+\verbatiminput{fleet.g}
+
+\pagebreak
+\section*{Java APIs}
+\subsection*{Representing Code}
+\subsection*{Representing Ships}
+
+\pagebreak
+\section*{Misc}
+
+\begin{verbatim}
+- sequencing guarantees
+- codebag format
+- behavior when token arrives at data port, vice versa
+- overlapping codebags
+\end{verbatim}
+
+\pagebreak
+\section*{Future Directions}

 
 Looking back on the design of the pump, several things are now
 apparent which were not initially.  In particular, it seems that it
 
 Looking back on the design of the pump, several things are now
 apparent which were not initially.  In particular, it seems that it

diff --git a/doc/ports.svg b/doc/ports.svg
index bc2ab2d..a52652e 100644 (file)
--- a/doc/ports.svg
+++ b/doc/ports.svg
@@ -71,7 +71,7 @@
      inkscape:pageshadow="2"
      inkscape:zoom="1.5855365"
      inkscape:cx="510.02639"
      inkscape:pageshadow="2"
      inkscape:zoom="1.5855365"
      inkscape:cx="510.02639"

-     inkscape:cy="102.56622"
+     inkscape:cy="356.19542"

      inkscape:document-units="px"
      inkscape:current-layer="layer1"
      showgrid="true"
      inkscape:document-units="px"
      inkscape:current-layer="layer1"
      showgrid="true"

@@ -110,7 +110,7 @@
        sodipodi:nodetypes="cccc" />
     <path
        style="fill:none;fill-rule:evenodd;stroke:#800080;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
        sodipodi:nodetypes="cccc" />
     <path
        style="fill:none;fill-rule:evenodd;stroke:#800080;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"

-       d="M 850.3937,581.10236 L 627.62205,581.10236"
+       d="M 878.74016,581.10236 L 627.62205,581.10236"

        id="path3423"
        sodipodi:nodetypes="cc" />
     <path
        id="path3423"
        sodipodi:nodetypes="cc" />
     <path

@@ -120,7 +120,7 @@
        sodipodi:nodetypes="cccc" />
     <path
        style="fill:none;fill-rule:evenodd;stroke:#800080;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
        sodipodi:nodetypes="cccc" />
     <path
        style="fill:none;fill-rule:evenodd;stroke:#800080;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"

-       d="M 850.3937,262.20472 L 627.62205,262.20472"
+       d="M 878.74016,262.20472 L 627.62205,262.20472"

        id="path3419"
        sodipodi:nodetypes="cc" />
     <path
        id="path3419"
        sodipodi:nodetypes="cc" />
     <path

@@ -130,7 +130,7 @@
        sodipodi:nodetypes="cc" />
     <path
        style="fill:none;fill-rule:evenodd;stroke:#800080;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
        sodipodi:nodetypes="cc" />
     <path
        style="fill:none;fill-rule:evenodd;stroke:#800080;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"

-       d="M 850.3937,191.33858 L 627.62205,191.33858"
+       d="M 878.74016,191.33858 L 627.62205,191.33858"

        id="path3413"
        sodipodi:nodetypes="cc" />
     <path
        id="path3413"
        sodipodi:nodetypes="cc" />
     <path

@@ -140,12 +140,14 @@
        sodipodi:nodetypes="cc" />
     <path
        style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
        sodipodi:nodetypes="cc" />
     <path
        style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"

-       d="M 385.76378,496.06299 L 484.97638,496.06299"
-       id="path3195" />
+       d="M 347.24409,496.06299 L 484.97638,496.06299"
+       id="path3195"
+       sodipodi:nodetypes="cc" />

     <path
        style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
     <path
        style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"

-       d="M 450.45669,177.16535 L 393.76378,177.16535"
-       id="path3193" />
+       d="M 450.45669,177.16535 L 357.41732,177.16535"
+       id="path3193"
+       sodipodi:nodetypes="cc" />

     <path
        style="fill:none;fill-rule:evenodd;stroke:#0000ff;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
        d="M 566.92913,581.10237 L 566.92913,524.40945"
     <path
        style="fill:none;fill-rule:evenodd;stroke:#0000ff;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:none;stroke-opacity:1"
        d="M 566.92913,581.10237 L 566.92913,524.40945"

@@ -206,11 +208,11 @@
        id="rect3191"
        width="177.16536"
        height="552.75592"
        id="rect3191"
        width="177.16536"
        height="552.75592"

-       x="212.59842"
+       x="177.16536"

        y="106.29921" />
     <g
        id="g3407"
        y="106.29921" />
     <g
        id="g3407"

-       transform="translate(299.46456,106.75592)"
+       transform="translate(325.32331,106.75592)"

        style="stroke:#800080">
       <rect
          y="74.409424"
        style="stroke:#800080">
       <rect
          y="74.409424"

@@ -243,12 +245,12 @@
     </g>
     <path
        style="fill:none;fill-rule:evenodd;stroke:#800080;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:3, 3;stroke-dashoffset:0;stroke-opacity:1"
     </g>
     <path
        style="fill:none;fill-rule:evenodd;stroke:#800080;stroke-width:3;stroke-linecap:butt;stroke-linejoin:miter;marker-end:url(#Arrow2Mend);stroke-miterlimit:4;stroke-dasharray:3, 3;stroke-dashoffset:0;stroke-opacity:1"

-       d="M 850.04724,533.49606 L 635.62205,533.49606"
+       d="M 876.04724,533.49606 L 635.62205,533.49606"

        id="path3445"
        sodipodi:nodetypes="cc" />
     <g
        id="g3447"
        id="path3445"
        sodipodi:nodetypes="cc" />
     <g
        id="g3447"

-       transform="translate(299.46456,448.91341)"
+       transform="translate(325.98424,448.91341)"

        style="stroke:#800080">
       <rect
          y="74.409424"
        style="stroke:#800080">
       <rect
          y="74.409424"

@@ -282,12 +284,12 @@
     <text
        xml:space="preserve"
        style="font-size:52.43335342px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
     <text
        xml:space="preserve"
        style="font-size:52.43335342px;font-style:normal;font-weight:normal;fill:#000000;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"

-       x="240.94489"
+       x="205.51183"

        y="396.8504"
        id="text3459"><tspan
          sodipodi:role="line"
          id="tspan3461"
        y="396.8504"
        id="text3459"><tspan
          sodipodi:role="line"
          id="tspan3461"

-         x="240.94489"
+         x="205.51183"

          y="396.8504">Ship</tspan></text>
     <text
        xml:space="preserve"
          y="396.8504">Ship</tspan></text>
     <text
        xml:space="preserve"

@@ -301,76 +303,76 @@
          y="622.36218">Pump</tspan></text>
     <text
        xml:space="preserve"
          y="622.36218">Pump</tspan></text>
     <text
        xml:space="preserve"

-       style="font-size:12.39046097px;font-style:normal;font-weight:normal;fill:#800080;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
-       x="646.73108"
+       style="font-size:18px;font-style:normal;font-weight:normal;text-align:center;text-anchor:middle;fill:#800080;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
+       x="703.63574"

        y="256.02255"
        id="text3475"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3477"
        y="256.02255"
        id="text3475"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3477"

-         x="646.73108"
+         x="703.63574"

          y="256.02255"
          y="256.02255"

-         style="fill:#800080">Destination</tspan></text>
+         style="font-size:18px;text-align:center;text-anchor:middle;fill:#800080">Destination</tspan></text>

     <text
        xml:space="preserve"
     <text
        xml:space="preserve"

-       style="font-size:12.39046097px;font-style:normal;font-weight:normal;fill:#800080;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
-       x="644.90436"
+       style="font-size:18px;font-style:normal;font-weight:normal;text-align:center;text-anchor:middle;fill:#800080;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
+       x="703.63574"

        y="184.24554"
        id="text3479"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3481"
        y="184.24554"
        id="text3479"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3481"

-         x="644.90436"
+         x="703.63574"

          y="184.24554"
          y="184.24554"

-         style="fill:#800080">Destination</tspan></text>
+         style="font-size:18px;text-align:center;text-anchor:middle;fill:#800080">Destination</tspan></text>

     <text
        xml:space="preserve"
     <text
        xml:space="preserve"

-       style="font-size:12.39046097px;font-style:normal;font-weight:normal;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
-       x="644.90436"
+       style="font-size:18px;font-style:normal;font-weight:normal;text-align:center;text-anchor:middle;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
+       x="703.61377"

        y="134.64098"
        id="text3483"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3485"
        y="134.64098"
        id="text3483"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3485"

-         x="644.90436"
+         x="703.61377"

          y="134.64098"
          y="134.64098"

-         style="fill:#008080">Source</tspan></text>
+         style="font-size:18px;text-align:center;text-anchor:middle;fill:#008080">Source</tspan></text>

     <text
        xml:space="preserve"
     <text
        xml:space="preserve"

-       style="font-size:12.39046097px;font-style:normal;font-weight:normal;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
-       x="666.16492"
+       style="font-size:18px;font-style:normal;font-weight:normal;text-align:center;text-anchor:middle;fill:#0000ff;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
+       x="703.61377"

        y="455.52747"
        id="text3487"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3489"
        y="455.52747"
        id="text3487"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3489"

-         x="666.16492"
+         x="703.61377"

          y="455.52747"
          y="455.52747"

-         style="fill:#008080">Source</tspan></text>
+         style="font-size:18px;text-align:center;text-anchor:middle;fill:#008080">Source</tspan></text>

     <text
        xml:space="preserve"
     <text
        xml:space="preserve"

-       style="font-size:12.39046097px;font-style:normal;font-weight:normal;fill:#800080;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
-       x="653.99127"
+       style="font-size:18px;font-style:normal;font-weight:normal;fill:#800080;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
+       x="651.99121"

        y="528.39105"
        id="text3491"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3493"
        y="528.39105"
        id="text3491"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3493"

-         x="653.99127"
+         x="651.99121"

          y="528.39105"
          y="528.39105"

-         style="fill:#800080">Destination</tspan></text>
+         style="font-size:18px;fill:#800080">Destination</tspan></text>

     <text
        xml:space="preserve"
     <text
        xml:space="preserve"

-       style="font-size:12.39046097px;font-style:normal;font-weight:normal;fill:#800080;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
-       x="653.99127"
+       style="font-size:18px;font-style:normal;font-weight:normal;text-align:center;text-anchor:middle;fill:#800080;fill-opacity:1;stroke:none;stroke-width:1px;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;font-family:Bitstream Vera Sans"
+       x="703.63574"

        y="575.99573"
        id="text3495"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3497"
        y="575.99573"
        id="text3495"
        transform="scale(0.9999652,1.0000348)"><tspan
          sodipodi:role="line"
          id="tspan3497"

-         x="653.99127"
+         x="703.63574"

          y="575.99573"
          y="575.99573"

-         style="fill:#800080">Destination</tspan></text>
+         style="font-size:18px;text-align:center;text-anchor:middle;fill:#800080">Destination</tspan></text>

     <path
        style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:2;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-miterlimit:4;stroke-dasharray:none"
        d="M 389.76378,680.31495 L 389.76378,708.66141"
     <path
        style="fill:none;fill-rule:evenodd;stroke:#000000;stroke-width:2;stroke-linecap:butt;stroke-linejoin:miter;stroke-opacity:1;stroke-miterlimit:4;stroke-dasharray:none"
        d="M 389.76378,680.31495 L 389.76378,708.66141"