Intel® VTune™ Profiler User Guide

User Guide

Contents

Limit Data Collection

Specify a predefined amount of data to collect by setting up the expected result size or collection time.
This prevents from collecting a large amount of data that may slow down the data processing. For example, it may happen when running Threading Analysis on frequently contended applications or when analyzing long profiles.
Typically, the default maximum amount of raw data used by the
Intel® VTune™
Profiler
 for the result file is enough to identify a problem.
When the data size limit is reached and the data collection is suspended, click the
Stop
 button on the command toolbar at the bottom of the
Configure Analysis
 window. VTune Analyzer proceeds with the analysis of the collected data. If you want to extend the data collection for your target application for future analysis runs, you may modify the default size limit for collected data as follows:
  1. Click the
    Configure Analysis
     button on the
    VTune
    Profiler
     toolbar.
  2. Select a required target system from the
    WHERE
     pane and a target type from the
    WHAT
     pane.
  3. From the
    Advanced
     section of the
    WHAT
     pane, use the
    Limit collected data by
     group of options and choose any of the following mechanisms:
    • Result size from collection start, MB
      : Set the maximum possible result size (in MB) to collect.
      VTune
      Profiler
       will start collecting data from the beginning of the target execution and suspend data collection when the specified limit for the result size is reached. For unlimited data size, specify 0.
    • Time from collection end, sec
      : Set the timer enabling the analysis only for the last seconds before the target run or collection is terminated. For example, if you specified 2 seconds as a time limit, the
      VTune
      Profiler
       starts the data collection from the very beginning but saves the collected data only for the last 2 seconds before you terminate the collection.
    Limiting data collection to the beginning or end of the target execution reduces the size of the raw data gathered by the
    VTune
    Profiler
     and enables you to quickly start analyzing collection results. If you want to keep the default data size limit but continue collecting data on the next portion of the target execution, run the analysis after a delay using the Start Paused option.

Product and Performance Information

1

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