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[GNUnet-SVN] r27663 - in msh/doc: . fig/svg
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From: |
gnunet |
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Subject: |
[GNUnet-SVN] r27663 - in msh/doc: . fig/svg |
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Date: |
Thu, 27 Jun 2013 18:12:42 +0200 |
Author: harsha
Date: 2013-06-27 18:12:42 +0200 (Thu, 27 Jun 2013)
New Revision: 27663
Added:
msh/doc/fig/svg/ip_map.svg
Modified:
msh/doc/fig/svg/job_startup.svg
msh/doc/msh.tex
Log:
- documenting address verfication
Added: msh/doc/fig/svg/ip_map.svg
===================================================================
--- msh/doc/fig/svg/ip_map.svg (rev 0)
+++ msh/doc/fig/svg/ip_map.svg 2013-06-27 16:12:42 UTC (rev 27663)
@@ -0,0 +1,280 @@
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+
+<svg
+ xmlns:dc="http://purl.org/dc/elements/1.1/";
+ xmlns:cc="http://creativecommons.org/ns#";
+ xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
+ xmlns:svg="http://www.w3.org/2000/svg";
+ xmlns="http://www.w3.org/2000/svg";
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+ height="205.53125"
+ id="svg3079"
+ version="1.1"
+ inkscape:version="0.48.3.1 r9886"
+ sodipodi:docname="ip_map.svg">
+ <defs
+ id="defs3081">
+ <marker
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+ orient="auto"
+ refY="0"
+ refX="0"
+ id="Arrow1Mend"
+ style="overflow:visible">
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+ style="fill-rule:evenodd;stroke:#000000;stroke-width:1pt"
+ transform="matrix(-0.4,0,0,-0.4,-4,0)"
+ inkscape:connector-curvature="0" />
+ </marker>
+ </defs>
+ <sodipodi:namedview
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+ pagecolor="#ffffff"
+ bordercolor="#666666"
+ borderopacity="1.0"
+ inkscape:pageopacity="0.0"
+ inkscape:pageshadow="2"
+ inkscape:zoom="1.979899"
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+ inkscape:cy="78.368"
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+ fit-margin-bottom="0" />
+ <metadata
+ id="metadata3084">
+ <rdf:RDF>
+ <cc:Work
+ rdf:about="">
+ <dc:format>image/svg+xml</dc:format>
+ <dc:type
+ rdf:resource="http://purl.org/dc/dcmitype/StillImage"; />
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+
style="fill:#000000;fill-opacity:0.48034937;stroke:#0f0707;stroke-width:1;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0"
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+ width="9.0913725"
+ height="8.3337584"
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Modified: msh/doc/fig/svg/job_startup.svg
===================================================================
--- msh/doc/fig/svg/job_startup.svg 2013-06-27 15:29:10 UTC (rev 27662)
+++ msh/doc/fig/svg/job_startup.svg 2013-06-27 16:12:42 UTC (rev 27663)
@@ -67,9 +67,9 @@
borderopacity="1.0"
inkscape:pageopacity="0.0"
inkscape:pageshadow="2"
- inkscape:zoom="5.6"
- inkscape:cx="270.69217"
- inkscape:cy="103.8325"
+ inkscape:zoom="1.4"
+ inkscape:cx="358.57492"
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inkscape:document-units="px"
inkscape:current-layer="layer1"
showgrid="false"
@@ -177,7 +177,7 @@
id="tspan4422"
x="148.5"
y="357.7193"
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+ style="font-style:normal">4</tspan></text>
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style="font-size:10px;font-style:italic;font-variant:normal;font-weight:normal;font-stretch:normal;text-align:center;line-height:125%;letter-spacing:0px;word-spacing:0px;text-anchor:middle;fill:#000000;fill-opacity:1;stroke:none;font-family:Serif;-inkscape-font-specification:Sans
Italic"
@@ -189,7 +189,7 @@
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x="151.40085"
y="402.89536"
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@@ -308,7 +308,7 @@
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x="78.388351"
y="379.25613"
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@@ -332,7 +332,7 @@
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x="396.73215"
y="375.54449"
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+ y="350.38989">3, 7</tspan></text>
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Modified: msh/doc/msh.tex
===================================================================
--- msh/doc/msh.tex 2013-06-27 15:29:10 UTC (rev 27662)
+++ msh/doc/msh.tex 2013-06-27 16:12:42 UTC (rev 27663)
@@ -57,31 +57,18 @@
\item The execution wrapper starts an \texttt{mshd} instance on each of the
allocated hosts. We distinguish the instance having MPI id 0 as the master
instance and all other instances as worker instances.
-\item Each \texttt{mshd} instance opens a local socket with a random free port
- and binds it to all available IP addresses of its host.
-\item The worker instances send their IP addresses and port numbers to which
- their local sockets were bound to the master instance using MPI messaging.
-\item The master instance verifies the received group of IP addresses from each
- worker instance by opening a TCP connection to the socket with each of the
- received IP addresses in parallel and in non-blocking mode. The IP address
- corresponding to the first successfully established TCP connection is deemed
- as the worker instance's IP.
-\item After verifying the IP addresses of all worker instances, the master
- instance chooses a worker instance to verify its own IP addresses.
-\item The worker instance verifies the IP address of the master instance
-\item The worker instance notifies the master instance of its IP address.
-\item The master instance broadcasts the instance--IP mapping to all worker
- instances through MPI.
+\item The instances resolve their addresses. This is further detailed in
+ Section~\ref{sec:addressing}.
\item All the instances open a local socket for IPC and set an environmental
variable to refer to this socket. The master instance then starts the given
- application which defaults to \texttt{bash} if it not specified as a
parameter
- to \texttt{mshd} in the execution wrapper.
+ application which defaults to \texttt{bash} if it is not specified as a
+ parameter to \texttt{mshd} in the execution wrapper.
\item The application calls \texttt{msh} for executing a remote command on one
of the allocated hosts.
\item The \texttt{msh} program inherits the environmental variable set by the
master instance and communicates to the master instance the remote command to
- be executed through IPC. Additionally, it forwards its stdin and stderr as
- stdin and stderr respectively for the remote command to the master instance.
+ be executed through IPC. Additionally, it forwards its stdin, stdout and
+ stderr as from the remote command to the master instance.
\item The master instance determines the worker instance responsible for
executing the remote command from the instance--IP mapping and relays the
remote command, its stdin and stderr to the worker instance through MPI.
@@ -91,6 +78,36 @@
instance for relaying the command to the remote instance.
\end{enumerate}
+\section{Addressing}
+\label{sec:addressing}
+While using \texttt{msh} remote hosts are addressed with their IP addresses.
+However, as the real communication is done through MPI, a mapping between the
IP
+addresses of all the hosts where the instances run and the instances' MPI id
has
+to be determined. This mapping is given to the application as a file from
which
+the application can refer by IP address the host for executing a remote
command.
+The mapping is determined by having each instance verify the IP addresses of
all
+other instances in $n$ rounds for $n$ allocated hosts. Before beginning the
+verification rounds, all instances open a socket on their hosts with a randomly
+picked free port and bind to all the host's IP addresses. In each round an
+instance learns about the IP addresses of other instance and verifies them by
+establishing TCP connections to the other instance's socket with one TCP
+connection for each of its IP address. The TCP connections are started in
+parallel and in non-blocking mode. This is depicted in
Figure~\ref{fig:ip_map}.
+
+\begin{figure}[h]
+ \centering
+ \input{fig/svg/ip_map.pdf_tex}
+ \caption{Instances verifying IP addresses during $i^{th}$ round}
+ \label{fig:ip_map}
+\end{figure}
+
+At the end of the last round. All instances would have verified the IP
+addresses of other instances and posses an instance--IP mapping. At this
point,
+they accumulate their mappings using a reduction algorithm (binary/ binomial
+tree reduction). The reduction is made by intersecting the reported IP
+addresses for an instance.
+
+
\end{document}
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