Intel® Advisor User Guide

User Guide

Contents

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:
non-parallel nature of a serial node
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.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.