PC farm purchasement meeting@CERN

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+\input{../../common/header.tex}
+\usepackage[ngerman]{babel}
+\usepackage{bibgerm}
+
+%
+% Paket um LIstings sauber zu formatieren.
+%
+\usepackage{listings}
+
+% Umlaute für listings
+ \lstset{
+  literate= {Ö}{{\"O}}1 {Ä}{{\"A}}1 {Ü}{{\"U}}1 {ß}{{\ss}}2 {ü}{{\"u}}1
+ {ä}{{\"a}}1 {ö}{{\"o}}1
+ }
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+
+\definecolor{javared}{rgb}{0.6,0,0} % for strings
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+\definecolor{javapurple}{rgb}{0.5,0,0.35} % keywords
+\definecolor{javadocblue}{rgb}{0.25,0.35,0.75} % javadoc
+
+
+ \AtBeginSection[]{%
+ \begin{frame}
+ \tableofcontents[currentsection]
+ \end{frame}
+ }
+
+\lstset{%
+  language=C++,
+  basicstyle=\ttfamily,
+  commentstyle=\itshape\color{darkgreen},
+  keywordstyle=\bfseries\color{darkblue},
+  stringstyle=\color{darkred},
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+  showstringspaces=false,
+  xleftmargin=1cm,
+  captionpos=b,
+  otherkeywords={$, \{, \}, \[, \], class}
+}%s
+
+\title{Implementation of L1 and L2 in the PC farm}
+\author{Jonas Kunze}
+\date{27.03.2013}
+
+\institute[{Universität Mainz}]{
+	\inst{} Universität Mainz}
+\titlegraphic{\includegraphics[height=3cm]{penguins}}
+%\logo{\includegraphics[width=2cm]{na62-logo}}
+\subject{NA62 online pc-farm design and implementation}
+\keywords{NA62,computing,multithreading,trigger,c++,boost,asio,10g}
+
+\begin{document}
+  	\frame{\titlepage}
+  	%\frame{\tableofcontents}
+
+  	\input{pages.tex}
+\end{document}

meetings/14.02.11_cern-pc-farm/.svn/text-base/pages.tex.svn-base

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+\section{L1 computation}
+
+\begin{frame}{L1 Eventbuilding}{}
+	\begin{block}{L1 Eventbuilding}
+		L1 trigger executed not before all L0 data has been received \\
+		$\Rightarrow$ L1 algorithms have access to full event (except LKr data)
+	\end{block}
+
+	\begin{exampleblock}{All detectors processed within one thread}
+		You can define the (most efficient) order of the algorithms\\
+		e.g. execute most CPU demanding parts at last
+	\end{exampleblock}
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{L1 interface}
+After successfully collecting all L0 data of one event the following method is
+invoked:
+\begin{lstlisting}[frame=trBL,caption={}]{}
+const uint16_t L1TriggerProcessor::compute(Event* event) {
+    // Your code comes here
+    ...
+    return (L0Trigger + L1Trigger<<8);
+}
+\end{lstlisting}
+if L1Trigger==0 the event will be discarded by the framework
+\end{frame}
+
+
+\begin{frame}{Event data structure}{}
+\begin{center}
+  \includegraphics[width=6cm]{event-data-structure}
+\end{center}
+MEPEvent: The actual raw data struct as received via a MEP. Each
+subevent has as many MEPEvents as sources (Tel62 boards) are sending MEPs.
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{Accessing the raw data}
+Event has one getter function for each detector:
+\begin{lstlisting}[frame=trBL,caption={}]{}
+Subevent* muv=event->getMUVSubevent();
+for (int p = muv->getNumberOfParts()-1;  p >= 0; p--) {
+  MEPEvent* mepData = muv->getPart(p);
+  mepData->getSourceID();
+  mepData->getData();
+  mepData->getEventLength();
+}
+\end{lstlisting}
+\end{frame}
+
+\begin{frame}[fragile]
+\frametitle{L0TP}
+Some data has to be taken from the L0TP data:
+\begin{lstlisting}[frame=trBL,caption={}]{}
+MEPEvent* L0TPEvent = event->getL0TPSubevent()->getPart(0);
+
+//Struct L0TP has to be defined:
+L0TP* L0TPData = (L0TP*) L0TPEvent->getData();
+event->setFinetime(L0TPData->fineTime);
+\end{lstlisting}
+\end{frame}
+
+\section{L2 computation}
+\begin{frame}[fragile]
+\frametitle{L2interface}
+After successfully collecting all CREAM data of one event the following method
+is invoked with the very same Event object:
+\begin{lstlisting}[frame=trBL,caption={}]{}
+const uint8_t L2TriggerProcessor::compute(Event* event) {
+    // Your code comes here
+    ...
+    return L2Trigger;
+}
+\end{lstlisting}
+Event may be used for L1$\rightarrow$L2 communications
+\end{frame}
+
+% \begin{frame}[fragile]
+% \frametitle{CREAM data}
+% Accessing the CREAM data has to be done by crateID and CREAMID:
+% \begin{lstlisting}[frame=trBL,caption={}]{}
+% LKREvent* lkrEvent = event->getLKrEvent(crateID, creamID);
+% lkrEvent->getData();
+% lkrEvent->getEventLength();
+% \end{lstlisting}
+% \end{frame}
+
+\section{Constraints}
+\begin{frame}{Constraints for the trigger implementations}{}
+There are no constraints concerning CPU time or memory consumption:
+The more you need, the more PCs you have to buy!
+
+\begin{itemize}
+  \item Do not use any kind of parallelisation without asking me!!!
+  \item Do not free any memory coming from *event
+  \item Use Eclipse for development: (code completion, easy debugging, auto
+  make, refactoring\ldots)
+\end{itemize}
+\end{frame}
+
+\section{Future approach}
+\begin{frame}{Accessing the code}{}
+The code (eclipse project) is available under CERN SVN:\\ \\
+svn co https://svn.cern.ch/reps/na62-farm/na62-farm \\
+
+Access has to be requested via mail: [email protected]
+
+\begin{block}{Dependencies/Prerequisites}
+\begin{enumerate}
+  \item boost and tcmalloc (run install/install.sh)
+  \item Root access
+  \item PCIe network device
+  \item pf\_ring: (installed via install/install.sh)
+\end{enumerate}
+
+I can implement a low performance version to get rid of points 2-4
+
+\end{block}
+\end{frame}
+
+\begin{frame}{To be done}{}
+\begin{block}{Simulation with MC data}
+ Only simple Tel62/CREAM simulators exist sending random data
+\end{block}
+\begin{ergo}
+If someone generates MEP files out of MC data I can implement the transmitter
+needed to test the L1/L2 algorithms
+\end{ergo}
+\end{frame}
+
+\section{Summary}
+\begin{frame}{Summary}{}
+\begin{itemize}
+  \item You can put your algorithms into na62-farm/l[12]
+  \item Someone has to manage L[12]TriggerProcessor::compute (order of
+  algorithms)
+  \item Someone has to provide me MC data in the MEP format
+  \item Please request access to the repository the next 10 days!
+  \item Feel free to: ssh root@na62farm6 "eclipse"
+\end{itemize}
+\end{frame}