Choose Problem

Intel® Inspector is a dynamic memory and threading error checking tool for users developing serial and multithreaded applications on Windows* and Linux* operating systems. This topic is part of a tutorial that shows how to find and fix threading errors using the Intel Inspector and a Fortran sample application.

To start exploring a detected threading error:

Understand Key Terms

code location: A fact the Intel Inspector observes at a source code location, such as a write code location. Previously called an observation.

problem: One or more occurrences of a detected issue, such as an uninitialized memory access. Multiple occurrences have the same call stack but a different thread or timestamp. You can view information for a problem as well as for each occurrence.

problem set: A group of problems with a common problem type and a shared code location that might share a common solution, such as a problem set resulting from deallocating an object too early during application execution. You can view problem sets only after analysis is complete.

See the Intel® Inspector Glossary for more key terminology.

Understand Summary Window Panes

A Summary window similar to the following automatically displays after analysis completes successfully.

Summary window


The Summary window is the starting point for managing result data. It groups problems into problem sets and then prioritizes the problem sets by severity and size.


Think of the Problems pane as a to-do list. Start at the top and work your way down. Try viewing the problems in various problem sets by clicking the corresponding Expand control icon.


The Code Locations pane shows the code location summary, surrounding source code snippet, and call stack information for all code locations in one or all occurrences of the problem(s) highlighted in the Problems pane.

Try using the various controls on the slider to view information for different occurrences of the highlighted problem.

Choose a Problem

When you are finished experimenting:

  1. Click the Expand control icon for all Data race problem sets.

  2. Double-click the data row for one of the Data race problems at line 148 in the nqueens_threading.f90 source file to display the Sources window, which provides more visibility into the cause of the error.

Optimization Notice: 
For more complete information about compiler optimizations, see our Optimization Notice.