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documents/Programmierparadigmen/MPI.tex
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@ -7,7 +7,7 @@ der den Nachrichtenaustausch bei parallelen Berechnungen auf
verteilten Computersystemen beschreibt.
Prozesse kommunizieren in MPI über sog. \textit{Kommunikatoren}. Ein Kommunikator
(\texttt{MPI\_Comm}\xindex{MPI\_Comm})
(\texttt{MPI\_Comm}\xindex{MPI\_Comm@\texttt{MPI\_Comm}})
definiert eine Menge an Prozessen, die miteinander kommunizieren können. In dieser
Prozessgruppe hat jeder Prozess einen eindeutigen \textit{rank}\xindex{rank} über den die Prozesse
sich identifizieren können.
@ -19,7 +19,7 @@ Das wird \texttt{mpicc hello-world.c} kompiliert.\\
Mit \texttt{mpirun -np 14 scripts/mpi/a.out} werden 14 Kopien des Programms
gestartet.
Hierbei ist \texttt{MPI\_COMM\_WORLD}\xindex{MPI\_COMM\_WORLD} der Standard-Kommunikator,
Hierbei ist \texttt{MPI\_COMM\_WORLD}\xindex{MPI\_COMM\_WORLD@\texttt{MPI\_COMM\_WORLD}} der Standard-Kommunikator,
der von \texttt{MPI\_Init} erstellt wird.
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
@ -36,7 +36,7 @@ der von \texttt{MPI\_Init} erstellt wird.
\end{table}
\section{Funktionen}
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/comm-size.c}\xindex{MPI\_Comm\_size}%
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/comm-size.c}\xindex{MPI\_Comm\_size@\texttt{MPI\_Comm\_size}}%
Liefert die Größe des angegebenen Kommunikators; dh. die Anzahl der Prozesse in der Gruppe.
\textbf{Parameter}
@ -49,7 +49,7 @@ Liefert die Größe des angegebenen Kommunikators; dh. die Anzahl der Prozesse i
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/comm-size-example.c}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\goodbreak
\rule{\textwidth}{0.4pt}\xindex{MPI\_Comm\_rank}%
\rule{\textwidth}{0.4pt}\xindex{MPI\_Comm\_rank@\texttt{MPI\_Comm\_rank}}%
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/comm-rank.c}
Bestimmt den Rang des rufenden Prozesses innerhalb des Kommunikators.
@ -65,7 +65,7 @@ Der Rang wird von MPI zum Identifizieren eines Prozesses verwendet. Die Rangnumm
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/comm-rank-example.c}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\goodbreak
\rule{\textwidth}{0.4pt}\xindex{MPI\_Send}%
\rule{\textwidth}{0.4pt}\xindex{MPI\_Send@\texttt{MPI\_Send}}%
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/mpi-send.c}
Senden einer Nachricht an einen anderen Prozeß innerhalb eines Kommunikators. (Standard-Send)
@ -84,7 +84,7 @@ Ein Kommunikationsvorgang wird durch ein Tripel (Sender, Empfänger, tag) eindeu
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/mpi-send-example.c}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\goodbreak
\rule{\textwidth}{0.4pt}\xindex{MPI\_Recv}%
\rule{\textwidth}{0.4pt}\xindex{MPI\_Recv@\texttt{MPI\_Recv}}%
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/mpi-receive.c}
Empfangen einer Nachricht (blockierend)
@ -105,7 +105,7 @@ Empfangen einer Nachricht (blockierend)
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/mpi-receive-example.c}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\goodbreak
\rule{\textwidth}{0.4pt}\xindex{MPI\_Reduce}%
\rule{\textwidth}{0.4pt}\xindex{MPI\_Reduce@\texttt{MPI\_Reduce}}%
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/mpi-reduce.c}
Führt eine globale Operation \textbf{op} aus; der Prozeß \enquote{root} erhält das Resultat.
@ -120,7 +120,7 @@ Führt eine globale Operation \textbf{op} aus; der Prozeß \enquote{root} erhäl
\end{itemize}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\goodbreak
\rule{\textwidth}{0.4pt}\xindex{MPI\_Alltoall}%
\rule{\textwidth}{0.4pt}\xindex{MPI\_Alltoall@\texttt{MPI\_Alltoall}}%
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/mpi-alltoall.c}
Teilt Daten von jedem Prozeß einer Gruppe an alle anderen auf.
@ -138,7 +138,7 @@ Teilt Daten von jedem Prozeß einer Gruppe an alle anderen auf.
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/mpi-alltoall-example.c}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\goodbreak
\rule{\textwidth}{0.4pt}\xindex{MPI\_Bcast}%
\rule{\textwidth}{0.4pt}\xindex{MPI\_Bcast@\texttt{MPI\_Bcast}}%
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/mpi-bcast.c}
Sendet eine Nachricht vom Prozess \texttt{root} an alle anderen Prozesse des
angegebenen Kommunikators.
@ -153,7 +153,7 @@ angegebenen Kommunikators.
\end{itemize}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\goodbreak
\rule{\textwidth}{0.4pt}\xindex{MPI\_Scatter}%
\rule{\textwidth}{0.4pt}\xindex{MPI\_Scatter@\texttt{MPI\_Scatter}}%
\inputminted[numbersep=5pt, tabsize=4]{c}{scripts/mpi/mpi-scatter.c}
Verteilt Daten vom Prozess \texttt{root} unter alle anderen Prozesse in der Gruppe, so daß, soweit möglich, alle Prozesse gleich große Anteile erhalten.