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             <h1>Runtime Design</h1>
             <div id="markdown-content-container"><h3 id="receiving-a-job-from-the-nemo-compiler">Receiving a Job from the Nemo Compiler</h3>

 <p>After the compiler goes through a set of passes for optimization, the optimized Nemo IR is translated into into a
 physical form for the execution runtime to execute. This involves translations like expanding an operator annotated
 with parallelism in Nemo IR to the desired number of tasks and connecting the tasks according to the data communication
 patterns annotated on the IR edges. Physical execution plan is also in the form of a DAG, with the same values annotated
 for execution properties as the given IR DAG if necessary. Nemo IR DAG and physical execution plan can be translated
 from one another by sharing the identifiers.</p>

 <h3 id="runtime-architecture">Runtime Architecture</h3>
 <p>The Nemo runtime consists of a <em>RuntimeMaster</em> and multiple <em>Executors</em>.
 <em>RuntimeMaster</em> takes the submitted physical execution plan and schedules each <em>TaskGroup</em> to <em>Executor</em> for execution.</p>

 <p>The figure below shows the Nemo runtime’s overall architecture.
 Our runtime’s components can be broken down into two parts, the processing backbone and the extensible modules.</p>

 <p>The processing backbone illustrated by the blue double stroked boxes in the figure below,
 implements the inherent and basic code that must be executed for all Nemo jobs
 (and potentially all data processing jobs).
 The code includes references to the flexible and extensible data structures
 representing our execution properties.
 For example, “executor placement” is mainly controlled in ContainerManager as an extensible map.</p>

 <p>The extensible modules illustrated by the red dashed boxes in the figure below,
 are interfaces which users can implement in order to get them to behave the way the user wants.
 Each interface has been transparently integrated with other components of the runtime.</p>

 <p><img src="/assets/img/runtime.jpg" alt="image" /></p>

 <h3 id="dictionary">Dictionary</h3>
 <ul>
   <li>Stage: A unit of execution the runtime uses for scheduling the job.</li>
   <li>TaskGroup: A computation unit composed of one or more tasks that can be computed in a single executor.</li>
   <li>Block: The unit of data output by a single task.</li>
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	<h1>Runtime Design</h1>
	<div id="markdown-content-container"><h3 id="receiving-a-job-from-the-nemo-compiler">Receiving a Job from the Nemo Compiler</h3>

	<p>After the compiler goes through a set of passes for optimization, the optimized Nemo IR is translated into into a
	physical form for the execution runtime to execute. This involves translations like expanding an operator annotated
	with parallelism in Nemo IR to the desired number of tasks and connecting the tasks according to the data communication
	patterns annotated on the IR edges. Physical execution plan is also in the form of a DAG, with the same values annotated
	for execution properties as the given IR DAG if necessary. Nemo IR DAG and physical execution plan can be translated
	from one another by sharing the identifiers.</p>

	<h3 id="runtime-architecture">Runtime Architecture</h3>
	<p>The Nemo runtime consists of a <em>RuntimeMaster</em> and multiple <em>Executors</em>.
	<em>RuntimeMaster</em> takes the submitted physical execution plan and schedules each <em>TaskGroup</em> to <em>Executor</em> for execution.</p>

	<p>The figure below shows the Nemo runtime’s overall architecture.
	Our runtime’s components can be broken down into two parts, the processing backbone and the extensible modules.</p>

	<p>The processing backbone illustrated by the blue double stroked boxes in the figure below,
	implements the inherent and basic code that must be executed for all Nemo jobs
	(and potentially all data processing jobs).
	The code includes references to the flexible and extensible data structures
	representing our execution properties.
	For example, “executor placement” is mainly controlled in ContainerManager as an extensible map.</p>

	<p>The extensible modules illustrated by the red dashed boxes in the figure below,
	are interfaces which users can implement in order to get them to behave the way the user wants.
	Each interface has been transparently integrated with other components of the runtime.</p>

	<p><img src="/assets/img/runtime.jpg" alt="image" /></p>

	<h3 id="dictionary">Dictionary</h3>
	<ul>
	<li>Stage: A unit of execution the runtime uses for scheduling the job.</li>
	<li>TaskGroup: A computation unit composed of one or more tasks that can be computed in a single executor.</li>
	<li>Block: The unit of data output by a single task.</li>
	<li>Partition: A block consists of one or more partitions, depending on the <em>Partitioner</em> choice.</li>
	</ul>

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