Intel® Advisor User Guide

ID 766448
Date 3/31/2023

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Showing Non-Parallel Nature of a Serial Node

You can use the Scalability analysis plugin to identify nodes that have no parallelism or to tell when an unlimited node is running serially.

For this example, use a source_node and a function_node connected to it. Set the following:

  1. Select the function_node.

  2. in the Node Concurrency field, enter 1 or serial. This makes the node run serially.

  3. In the Node Weight field, enter 1.

  4. Select the source_node.

  5. In the Node Weight field, enter 1e-6.

  6. Go to the Edit > Properties > TBB.

  7. Set the concurrency specification to 1,2,4,8 and click OK.

  8. Run the scalability analysis.

You will get the following results:

As expected, time is 8s, regardless of the number of threads used.

You can get the same results if you set the weight of the source_node to 1s and the weight to the function_node to a relatively negligible value. This is because a source_node executes its body serially.