Intel® Inspector User Guide for Linux* OS

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ID 767796
Date 7/13/2023
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Document Table of Contents
Document Table of Contents x
Intel® Inspector User Guide for Linux* OS
Intel® Inspector User Guide for Linux* OS x
Get Started Before You Begin Set Up a Project Collect Results Investigate Results Test for Regressions Use Cases Suppressions Support API Support Troubleshooting User Interface Reference Problem Type Reference Command Line Interface Support MPI Applications Support Appendix Notices and Disclaimers
Get Started x
Dynamic Analysis vs. Static Analysis Key Terminology Sample Applications and Tutorials Workflows-Quick Paths to Maximizing Productivity
Workflows-Quick Paths to Maximizing Productivity x
Analysis Workflow Reporting Workflow Regression Testing Workflow
Before You Begin x
Intel Inspector GUI Startup Tasks
Startup Tasks x
Change Result and Result Directory Name Templates Choose Baseline Results for Setting States Choose Debuggers Display Application Output
Set Up a Project x
Build Your Application Choose Projects Configure Projects
Choose Projects x
Choose Projects in the Intel Inspector GUI Create Projects in the Intel Inspector GUI
Configure Projects x
Binary/Symbol Search and Source Search Locations Choose Data Sets Manage Suppression Rules Search Non-standard Directories Set Project Properties-Advanced Set Target Application Properties - Basic
Collect Results x
Configure Analysis Run Analysis Examine Result Data During Analysis
Configure Analysis x
Memory Error Analysis Types Threading Error Analysis Types Manage Custom Analysis Types
Run Analysis x
Run Memory Error and Threading Error Analyses Stop Analysis
Examine Result Data During Analysis x
Find Memory Leaks On Demand Measure Memory Growth
Investigate Results x
View Results Choose Problems Interpret Result Data and Resolve Issues Investigate Problems Using Interactive Debugging Collaborate on Results Export and Import Files Compare Results
View Results x
Manage Help Snippet Displays Open Results Show Result Summaries
Choose Problems x
Deselecting Filter Criteria Refining the Source File Set Selecting Filter Criteria Selecting Problems
Interpret Result Data and Resolve Issues x
Severity Levels States Access the Explain Problem Help Change States Customize Frame Presentation Customize Data Columns Edit Source Code
Investigate Problems Using Interactive Debugging x
Extended Debugging Commands Stop Analyses During Interactive Debugging
Collaborate on Results x
State Merge Merge States Across Results Report Result Data
Export and Import Files x
Export Archives Import Archives and Other Files
Test for Regressions x
Tes for Regressions: Recommended Approach Test for Regressions: Other Approaches
Use Cases x
Analyze Offloaded Code
Analyze Offloaded Code x
Example: Memory Problem Example: Threading Problem
Suppressions Support x
Suppressions Support Using the GUI Suppressions Support Using Handwritten Suppression Rules Suppressions Support Using Third-party Suppression Rules
Suppressions Support Using the GUI x
Typical Suppressions Usage Model Using the GUI Suppression Rule Reach in the GUI Suppression Rule Examples in the GUI Defining Suppression Rules in the GUI Deleting Suppression Rules Applied to Marked Result Data in the GUI
Suppressions Support Using Handwritten Suppression Rules x
Typical Suppressions Usage Models Using Handwritten Suppression Files Suppression Rule Syntax in Text Format Suppression Rule Examples in Text Format
Suppressions Support Using Third-party Suppression Rules x
Typical Suppressions Usage Models Using Third-party Suppression Files Third-party Suppression Files
API Support x
APIs for Custom Synchronization APIs for Custom Memory Allocation APIs for Collection Control
Troubleshooting x
Troubleshooting Anti-virus Software Issues Troubleshooting Application Crashes Troubleshooting Internal Thread Suspension Attempt Troubleshooting No Problems Detected Troubleshooting No Symbolic Information Troubleshooting OpenMP* Technology Issues Troubleshooting Out-of-memory Conditions
User Interface Reference x
Context Menus: Project Navigator Context Menus: Sources Window Panes Context Menus: Summary Window Panes Dialog Box: Corresponding inspxe-cl Command Options Dialog Box: Create a Project Dialog Box: Create Suppression Dialog Box: Custom Analysis Dialog Box: Delete Suppressions Dialog Box: Export Result Dialog Box: Merge States Dialog Box: Options-Debugger Dialog Box: Options-General Dialog Box: Options-Result Location Dialog Box: Options-State Management Dialog Box: Problem Report Dialog Box: Project Properties-Binary/Symbol Search Dialog Box: Project Properties-Source Search Dialog Box: Project Properties-Suppressions Dialog Box: Project Properties-Target Dialog Box: Refine Source File Set Dialog Box: Select Stack Frame(s) Dialog Box: View Stack Hot Keys Pane: Analysis Type-Custom Pane: Analysis Type-Memory Errors Pane: Analysis Type-Threading Errors Pane: Application Output Pane: Code and Stack Pane: Code Locations Pane: Collection Log Pane: Collector Messages Pane: Compare Results Pane: Filters Pane: Import Result Pane: Launch Application Pane: Problems Pane: Project Navigator Pane: Timeline Toolbar: Command Toolbar: Intel Inspector Toolbar: Navigation Window: Collection Log Window: Compare Results Window: Import Result Window: Sources Window: Summary After Analysis Is Complete Window: Summary During Analysis
Problem Type Reference x
Asynchronous Buffer Cross-thread Stack Access Data Race Deadlock C Example Fortran Example Possible Correction Strategies Host Pointer Used on Device Incorrect memcpy Call Invalid Deallocation Invalid Kernel Argument Invalid Kernel Argument Size Invalid Memory Access Invalid Partial Memory Access Lock Hierarchy Violation Memory Growth Memory Leak Memory Not Deallocated Mismatched Allocation/Deallocation Mismatched Queue Missing Allocation Non-Host Pointer Pointer from Different Device Thread Exit Information Thread Start Information Unhandled Application Exception Uninitialized Memory Access Uninitialized Partial Memory Access
Command Line Interface Support x
Command Syntax Command Syntax Alternatives and Rules Command Line Output Collecting Result Data from the Command Line Working with Reports from the Command Line Working with Suppressions from the Command Line inspxe-cl Actions, Options and Arguments
Working with Reports from the Command Line x
Reporting Result Data from the Command Line Saving and Formatting Reports from the Command Line Interpreting Result Data from the Command Line
Working with Suppressions from the Command Line x
Creating a Suppress-All File from the Command Line Converting Third-Party Suppression Files from the Command Line Applying Suppression Files from the Command Line Workaround for Disabled Suppressions from the Command Line
inspxe-cl Actions, Options and Arguments x
appdebug app-working-dir archive-name baseline-result collect collect-with command convert-suppression-file create-breakpoints create-suppression-file csv-delimiter debug-this executable-of-interest export filter finalize format help include-snippets include-sources import knob knob-list merge-states module-filter module-filter-mode no-auto-finalize no-summary option-file quiet report report-all report-output result-dir return-app-exitcode search-dir sort-asc sort-desc suppression-file user-data-dir verbose version
MPI Applications Support x
MPI Analysis Workflow Configure Installation Options Collect MPI Performance/Correctness Data Finalize MPI Collected Data View MPI Collected Data MPI Analysis Limitations Support of Non-Intel MPI Implementations Additional MPI Resources
Appendix x
Product Design Sample Code Caveats Intel Inspector Filenames and Locations Notational Conventions Related Information System APIs Supported During Memory Error Analysis System APIs Supported During Threading Error Analysis Evaluation Features
Intel® Inspector User Guide for Linux* OS

Deadlock

Occurs when two or more threads are waiting for each other to release resources (such as mutexes, critical sections, and thread handles) while holding resources the other threads are trying to acquire. If none of the threads release their resources, then none of the threads can proceed.

ID

Code Location

Description

1

Allocation site

If present, represents the location and associated call stack where the resource was created.

2

Lock owned

Represents the location and associated call stack of the thread holding the object requested by another thread.

3

Lock wanted

Represents the location and associated call stack of the thread requesting the object held by another thread.

NOTE:

  • Deadlock problems are usually, but not always, caused by Lock hierarchy violation problems. If the Intel Inspector detects a Deadlock problem caused by a Lock hierarchy violation problem, it reports only the Deadlock problem.

  • Intel Inspector cannot detect a Deadlock problem involving more than four threads.

C Example

Preparation

 

CRITICAL_SECTION cs1;
CRITICAL_SECTION cs2;
int x = 0;
int y = 0;
InitializeCriticalSection(&cs1); // Allocation Site (cs1)
InitializeCriticalSection(&cs2); // Allocation Site (cs2)

Thread #1

 

EnterCriticalSection(&cs1); // Lock Owned (cs1)
x++;
EnterCriticalSection(&cs2); // Lock Wanted (cs2)
y++;
LeaveCriticalSection(&cs2);
LeaveCriticalSection(&cs1);

Thread #2

 

EnterCriticalSection(&cs2); // Lock Owned (cs2)
y++;
EnterCriticalSection(&cs1); // Lock Wanted (cs1)
x++;
LeaveCriticalSection(&cs1);
LeaveCriticalSection(&cs2);

If thread #1 and thread #2 are concurrent and there is no other synchronization between them, the Intel Inspector detects a Deadlock problem if synchronization occurs in the following order:

  1. EnterCriticalSection(&cs1); in thread #1

  2. EnterCriticalSection(&cs2); in thread #2

Fortran Example

Preparation

 

include "omp_lib.h"
integer(omp_lock_kind) lock1
integer(omp_lock_kind) lock2
call omp_init_lock(lock1)
call omp_init_lock(lock2)

Thread #1

 

call omp_set_lock(lock1)
. . .
call omp_set_lock(lock2)
. . .
call omp_unset_lock(lock2)
. . .
call omp_unset_lock(lock1)

Thread #2

 

call omp_set_lock(lock2)
. . .
call omp_set_lock(lock1)
. . .
call omp_unset_lock(lock1)
. . .
call omp_unset_lock(lock2)

If thread #1 and thread #2 are concurrent and there is no other synchronization between them, the Intel Inspector detects a Deadlock problem if synchronization occurs in the following order:

  1. call omp_set_lock(lock1) in thread #1

  2. call omp_set_lock(lock2) in thread #2

Possible Correction Strategies

  • Do not use multiple synchronization objects if one synchronization object is sufficient.

  • Use recursive synchronization objects such as recursive mutexes if a thread must acquire the same object more than once.

  • Avoid the case where two threads wait for each other to terminate. Instead, use a third thread to wait for both threads to terminate.

  • Establish a global lock hierarchy and honor the same lock hierarchy in each thread. For example:

    • C language: If you have critical sections cs1 and cs2 and establish a global lock hierarchy (cs1 , cs2), always acquire cs1 before acquiring cs2 and release cs1 after releasing cs2.

    • Fortran language: If you have locks lock1 and lock2 and establish a global lock hierarchy (lock1, lock2), always acquire lock1 before acquiring lock2 and release lock1 after releasing lock2.

  • C language: Consider acquiring multiple synchronization objects at the same time using, for example, Microsoft Windows* system APIs such as WaitForMultipleObjects().

NOTE:

Sample Code Caveats

Parent topic: Problem Type Reference
Level Two Title