Intermediate Database Storage Section

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@ -59,8 +59,55 @@ Figure \ref{fig:CC} displays an example graph that leverages color coding to eas
\end{figure}
\TUsection{Intermediate Database Storage}
\TUsubsection{Memory Constraint Difficulties}
Previous works with RAGE have been designed around maximizing performance to limit the longer runtimes caused by the state space explosion, such as the works seen by the authors of \cite{cook_rage_2018},
\cite{li_concurrency_2019}, and \cite{li_combining_2019}.
\cite{li_concurrency_2019}, and \cite{li_combining_2019}. To this end, the output graph is stored in memory during the generation process to minimize disk writing and reading, as well as leverage the
performance benefits of memory operations since graph computation relies less on processor speed than that of data dependency complexity, parallelism coarseness, and memory access time
\cite{zhang_boosting_2017}, \cite{ainsworth_graph_2016}, \cite{berry_graph_2007}. The author of \cite{cook_rage_2018} does incorporate PostgreSQL as a final storage mechanism to write the resulting
graph information, but no intermediate storage is otherwise conducted.
While the design decision to not use intermediate storage maximizes performance for graph generation, it does suffer from a few complications. When generating large networks, the system runs the risk
of running out of memory. This typically does not occur when generation is conducted on small graphs, and is especially true when relatively small graphs are generated on a High Performance Computing
system with substantial memory. However, when running on local systems, or when the graph is large, memory can quickly be depleted due to state space explosion. The memory depletion is due to two primary
memory consumption points: the frontier which contains all of the states that still need to be explored, and the graph instance, which holds all of the network states and their state information
as well as all of the edges.
The frontier quickly becomes a problem point with large networks that contain many layers before reaching leaf nodes. During the generation process, RAGE works on a Breadth-First Search approach, and new states
are continuously discovered each time a state from the frontier is explored. In almost all cases, this means that for every state that is removed from the frontier, several more are added, leading to an ever-growing
frontier that can not be adequately reduced for large networks. Simultaneously, the graph instance is ever-growing as states are explored. When the network contains numerous assets, each with their own large sets of
qualities, the size of each state becomes noticeably larger. With some graphs containing millions of nodes and billions of edges, like those mentioned by the authors of \cite{zhang_boosting_2017}, it becomes increasingly
unlikely that the graph can be fully contained within system memory.
\TUsubsection{Maximizing Performance with Intermediate Database Storage}
Rather than a static implementation of storing to the database on disk at a set interval or a set size, the goal was to dynamically store to the database only when necessary. Since there is an associated cost with preparing
the writes to disk, the communication cost across nodes, the writing to disk itself, and with retrieving items from disk, it is desirable to store as much in memory for as long as possible and only write when necessary. When
running RAGE, a new argument can be passed \textit{(-a $<$double$>$)} to specify the amount of memory the tool should use before writing to disk. This argument is a value between 0 and 0.99 to specify a percentage.
This double is immediately reduced by 10\%. For instance, if 0.6 is passed, it is immediately reduced to 0.5. This acts as a buffer for PostgreSQL. Since queries will consume a variable amount of memory through parsing or preparation,
an additional 10\% is saved as a precaution. This can be changed later as needed or desired for future optimizations. Specific to the graph data, the statement is made that the frontier is allowed to consume half of the allocated memory,
and that the instance is allowed to consume the other half.
To decide when to store to the database instead of memory, two separate checks are made. The first check is for the frontier. If the size of the frontier consumes equal to or more than the allowed allocated memory, then all new states
are stored into a new table in the database called “unexplored states”. Each new state from this point forward is stored in the table, regardless of if room is freed in the frontier. This is to ensure proper ordering of the FIFO queue.
The only time new states are stored directly into the frontier is when the unexplored states table is empty. Once the frontier has been completely emptied, new states are then pulled from the database into the frontier. To pull from
the database, parent loop for the generator process has been altered. Instead of a while loop for when the frontier is not empty, it has been adjusted to when the frontier is not empty or the unexplored states table is not empty. Due
to C++ using short-circuit evaluation, some performance is gained since no SQL statement must be passed to disk to check the size of the unexplored states table unless the frontier is empty. The original design was to store new states
into the frontier during the critical section to avoid testing on already-explored states. As a result, writing new states to the database is also performed during the critical section.
For the instance, a check in the critical section determines if the size of the instance consumes more than its allocated share of the memory. If it does, the edges, network states, and network state items are written to the database,
and are then removed from memory.
However, a new issue arose with database storage. The original design was to save staging, preparation, and communication cost by writing all the data in one query (as in, writing all of the network states in one query, all the network
state items in one query, and all the edges in one query). While this was best in terms of performance, it was also not feasible. Building the SQL queries themselves quickly began depleting the already constrained memory with large storage
requests. As a result, the storage process would consume too much memory and crash the generator tool. To combat this, all queries had to be broken up into multiple queries. As previously mentioned, an extra 10\% buffer was saved
for the storage process. SQL query strings are now built until they consume the 10\% buffer, where they are then processed by PostgreSQL, cleared, and the query building process resumes.
\TUsubsection{Portability}
The intermediate database storage is greatly advantageous in increasing the portability of RAGE across various systems, while still allowing for performance benefits. By allowing for a user-defined argument, users can safely assign
a value that allows for other processes and for the host OS to continue their workloads. While the ``total memory" component currently utilizes the Linux \textit{sysconf()} function, this is not rigid and is easily adjustable. When
working on a High-Perfomance Computing cluster, using this function could lead to difficulties since multiple users may be working on the same nodes, which prevents RAGE from fully using all system memory. This could be prevented
by using a job scheduler argument such as Slurm's ``--exclusive" option, but this may not be desirable. Instead, a user could pass in the amount of total memory to use (and can be reused from a job scheduler's memory allocation
request option), and the intermediate database storage process would function in the same fashion.
\TUsection{Relational Operators} Fifth section of the third chapter.

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\begin{thebibliography}{1}
\bibitem{ainsworth_graph_2016}
Sam Ainsworth and Timothy~M. Jones.
\newblock Graph prefetching using data structure knowledge.
\newblock {\em Proceedings of the International Conference on Supercomputing},
01-03-June, 2016.
\bibitem{berry_graph_2007}
Jonathan Berry and Bruce Hendrickson.
\newblock Graph {Analysis} with {High} {Performance} {Computing}.
\newblock {\em Computing in Science and Engineering}, 2007.
\bibitem{cook_rage_2018}
Kyle Cook.
\newblock {\em {RAGE}: {The} {Rage} {Attack} {Graph} {Engine}}.
@ -17,4 +28,11 @@ Ming Li, Peter Hawrylak, and John Hale.
\newblock {\em Proceedings - 2019 2nd International Conference on Data
Intelligence and Security, ICDIS 2019}, pages 174--179, 2019.
\bibitem{zhang_boosting_2017}
Jialiang Zhang, Soroosh Khoram, and Jing Li.
\newblock Boosting the performance of {FPGA}-based graph processor using hybrid
memory cube: {A} case for breadth first search.
\newblock {\em FPGA 2017 - Proceedings of the 2017 ACM/SIGDA International
Symposium on Field-Programmable Gate Arrays}, pages 207--216, 2017.
\end{thebibliography}

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