MPI Tasks 4 and 5
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@ -64,11 +64,13 @@ Task Zero is performed by the root node, and is a conditional task; it is not gu
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\TUsubsubsection{Task One}
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\TUsubsubsection{Task Two}
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\TUsubsubsection{Task Three}
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\TUsubsubsection{Task Four}
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\TUsubsubsection{Task Five}
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\TUsubsubsection{Task Four and Task Five}
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Intermediate database operations, though not frequent and may never occur for small graphs, are lengthy and time-consuming when they do occur. As discussed in Section \ref{sec:db-stor}, the two main memory consumers are the frontier and the instance, both of which are contained by the root node. Since the database storage requests are blocking, the pipeline would halt for a lengthy period of time while waiting for the root node to finish potentially two large storages. Tasks 4 and 5 work to alleviate the stall by executing independently of the regular pipeline execution flow since no other task relies on data sent from these tasks. The root node can then asynchronously send the frontier and instance to the appropriate nodes as needed, clear its memory, and continue execution without delay.
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\TUsubsubsection{MPI Tags}
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\TUsubsection{Performance Expectations}
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\TUsubsection{Results}
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Communication cost of asynchronous send for T4 and T5 is less than the time requirement of a database storage by root.
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\TUsection{Subgraphing Approach}
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\TUsubsection{Introduction to the Subgraphing Approach}
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This is pdfTeX, Version 3.141592653-2.6-1.40.23 (TeX Live 2021/Arch Linux) (preloaded format=pdflatex 2022.2.14) 17 MAR 2022 23:44
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This is pdfTeX, Version 3.141592653-2.6-1.40.23 (TeX Live 2021/Arch Linux) (preloaded format=pdflatex 2022.2.14) 18 MAR 2022 00:30
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entering extended mode
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@ -284,12 +284,7 @@ File: ./Chapter5_img/horiz_task.drawio.png Graphic file (type png)
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Package pdftex.def Info: ./Chapter5_img/horiz_task.drawio.png used on input li
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[26] [27 <./Chapter5_img/horiz_task.drawio.png>]
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4.
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@ -342,14 +334,7 @@ CHAPTER 7.
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Output written on Schrick-Noah_MS-Thesis.pdf (48 pages, 434222 bytes).
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Output written on Schrick-Noah_MS-Thesis.pdf (48 pages, 434929 bytes).
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\contentsline {subsubsection}{Task One}{28}{}%
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\contentsline {subsubsection}{Task Two}{28}{}%
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\contentsline {subsubsection}{Task Three}{28}{}%
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\contentsline {subsubsection}{Task Four}{28}{}%
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\contentsline {subsubsection}{Task Five}{28}{}%
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\contentsline {subsection}{\numberline {5.3.3}\it Performance Expectations}{28}{}%
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\contentsline {subsubsection}{Task Four and Task Five}{28}{}%
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\contentsline {subsubsection}{MPI Tags}{30}{}%
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\contentsline {subsection}{\numberline {5.3.3}\it Performance Expectations}{30}{}%
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\contentsline {section}{\numberline {5.4}\bf Subgraphing Approach}{30}{}%
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\contentsline {subsection}{\numberline {5.4.1}\it Introduction to the Subgraphing Approach}{30}{}%
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\contentsline {subsection}{\numberline {5.4.2}\it Algorithm Design}{30}{}%
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