Intel® Trace Analyzer and Collector User and Reference Guide

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ID 767272
Date 10/31/2024
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Document Table of Contents
Document Table of Contents x
Intel® Trace Analyzer and Collector User and Reference Guide
Intel® Trace Analyzer and Collector User and Reference Guide x
Introduction Install and Set Up Intel® Trace Analyzer and Collector Trace Your Applications Analyze Your Applications Intel® Trace Collector Reference Intel® Trace Analyzer Reference Notices and Disclaimers
Introduction x
Notational Conventions Get Help
Trace Your Applications x
Tracing Conventional MPI Applications Tracing Failing MPI Applications Tracing OpenSHMEM* Applications Tracing MPI File IO Handling of Communicator Names Tracing MPI Load Imbalance Tracing User Defined Events Configuring the Collector Filtering Trace Data Recording OpenMP* Regions Information Tracing System Calls (Linux* OS) Collecting Lightweight Statistics Recording Source Location Information Recording Hardware Performance Information (Linux* OS) Recording Operating System Counters Tracing Library Calls Correctness Checking Tracing Distributed Non-MPI Applications
Correctness Checking x
Correctness Checking of MPI Applications Running with Valgrind* (Linux* OS) Configuring Error Checks Analyzing the Results Debugger Integration
Debugger Integration x
TotalView* Debugger GNU* Symbolic Debugger Allinea* Distributed Debugging Tool* (DDT*)
Analyze Your Applications x
Starting Intel® Trace Analyzer Intel Trace Analyzer Graphical User Interface Navigating Timelines Concepts Viewing Correctness Checking Reports Comparing Two Trace Files Interoperability with Intel® VTune™ Profiler and Intel® Advisor OpenMP* Regions Display Support OTF2 Format Support
Navigating Timelines x
Zoom Stack
Concepts x
Level of Detail Aggregation Advanced Aggregation Tagging and Filtering
Viewing Correctness Checking Reports x
Event Timeline Correctness Checking Reports Qualitative Timeline Correctness Checking Reports Detailed Dialog
Comparing Two Trace Files x
Mappings in Comparison Views Comparison Charts
Mappings in Comparison Views x
Mapping of Processes Mapping of Functions
Comparison Charts x
Comparison Function Profile Comparison Message Profile Comparison Collective Operations Profile
Intel® Trace Collector Reference x
API Reference Configuration Reference Correctness Checking Errors Structured Tracefile Format stftool Utility Time Stamping Secure Loading of Dynamic Link Libraries* on Windows* OS
API Reference x
Initialization, Termination and Control Defining and Recording Source Locations Defining and Recording Functions or Regions Defining and Recording Scopes Defining Groups of Processes Defining and Recording Counters enum VT_CountData enum VT_CountDisplay enum VT_CountScope VT_countdef VT_countval Recording Communication Events Additional API Calls in libVTcs C++ API
Initialization, Termination and Control x
VT_initialize VT_finalize VT_getrank VT_registerthread VT_registernamed VT_registerprefixed VT_getthrank VT_traceon VT_traceoff VT_tracestate VT_symstate VT_flush VT_timestamp VT_timestart VT_setfinalizecallback VT_getdescription VT_countsetcallback
Defining and Recording Functions or Regions x
New Interface Old Interface State Changes
C++ API x
VT_FuncDef Class Reference VT_SclDef Class Reference VT_Function Class Reference VT_Region Class Reference
Configuration Reference x
Configuration File Format Protocol File Configuration Options
Configuration Options x
ACTIVITY ALTSTACK AUTOFLUSH CHECK CHECK-LEAK-REPORT-SIZE CHECK-MAX-DATATYPES CHECK-MAX-ERRORS CHECK-MAX-PENDING CHECK-MAX-REPORTS CHECK-MAX-REQUESTS CHECK-SUPPRESSION-LIMIT CHECK-TIMEOUT CHECK-TRACING CLUSTER COMPRESS-RAW-DATA COUNTER CURRENT-DIR DEADLOCK-TIMEOUT DEADLOCK-WARNING DEMANGLE DETAILED-STATES ENTER-USERCODE ENVIRONMENT EXTENDED-VTF FLUSH-PID FLUSH-PREFIX GROUP HANDLE-SIGNALS INTERNAL-MPI KEEP-RAW-EVENTS LOGFILE-FORMAT LOGFILE-NAME LOGFILE-PREFIX LOGFILE-RANK MEM-BLOCKSIZE MEM-FLUSHBLOCKS MEM-INFO MEM-MAXBLOCKS MEM-MINBLOCKS MEM-OVERWRITE NMCMD OS-COUNTER-DELAY PCTRACE PCTRACE-CACHE PCTRACE-FAST PLUGIN PROCESS PROGNAME PROTOFILE-NAME STATISTICS STATE STF-PROCS-PER-FILE STF-USE-HW-STRUCTURE STOPFILE-NAME SYMBOL SYNC-MAX-DURATION SYNC-MAX-MESSAGES SYNC-PERIOD SYNCED-CLUSTER SYNCED-HOST TIME-WINDOWS (Experimental) TIMER TIMER-SKIP UNIFY-COUNTERS UNIFY-GROUPS UNIFY-SCLS UNIFY-SYMBOLS VERBOSE VT_START_PAUSED VT_COMPRESS_TRACE
Correctness Checking Errors x
Supported Errors How the Collection Works
How the Collection Works x
Parameter Checking Premature Exit Overlapping Memory Detecting Illegal Buffer Modifications Buffer Given to MPI Cannot Be Read or Written Distributed Memory Checking Illegal Memory Access Request Handling Datatype Handling Buffered Sends Deadlocks Checking Message Transmission Datatype Mismatches Data Modified during Transmission Checking Collective Operations Freeing Communicators
Structured Tracefile Format x
STF Components Single-File STF Configuring STF
stftool Utility x
stftool Utility Options Expanded ASCII output of STF Files
Time Stamping x
Clock Synchronization Choosing a Timer
Choosing a Timer x
gettimeofday/_ftime QueryPerformanceCounter CPU Cycle Counter Normalized CPU Cycle Counter MPI_Wtime() High Precision Event Timers POSIX* clock_gettime
Intel® Trace Analyzer Reference x
Graphical User Interface Reference Intel® Trace Analyzer Command Line Interface Reference Filter Expression Grammar otf2-to-stf Utility
Graphical User Interface Reference x
Welcome Page Summary Page Main Menu Bar View Menu Bar View Bars Charts Dialogs Settings
Main Menu Bar x
File Menu Options Menu Project Menu  Windows Menu Help Menu
View Menu Bar x
View Charts Navigate Advanced Layout Comparison Menu
Advanced x
Tagging Specific Events Filtering Events Simulating Ideal Communication Checking Application Imbalance Aggregating Results Aggregating Functions Creating Command Line for Intel® VTune™ Profiler and Intel® Advisor
View Bars x
Toolbar Trace Map Status Bar
Charts x
Event Timeline Qualitative Timeline Quantitative Timeline Counter Timeline Function Profile Message Profile Collective Operations Profile Performance Assistant Common Chart Features
Event Timeline x
Context Menu Filtering and Tagging
Qualitative Timeline x
Context Menu Filtering and Tagging
Quantitative Timeline x
Context Menu Filtering and Tagging
Counter Timeline x
Context Menu Filtering and Tagging
Function Profile x
Flat Profile Load Balance Call Tree Call Graph Context Menu Filtering and Tagging Function Profile Settings
Message Profile x
Context Menu Filtering and Tagging Aggregation Message Profile Settings
Collective Operations Profile x
Context Menu Filtering and Tagging Collective Operations Profile Settings
Dialogs x
Process Aggregation Function Aggregation Function Group Color Editor Filtering Dialog Box Tagging Dialog Box Idealization Dialog Box Imbalance Diagram Dialog Box Trace Merge Dialog Box  Details Dialog Box Source View Dialog Time Interval Selection Configuration Dialogs Find Dialog Box Command line for Intel® VTune™ Profiler and Intel® Advisor Dialog Box OTF2 to STF Conversion Dialog Box Configuration Assistant
Process Aggregation x
Comparison Mode
Function Aggregation x
Comparison Mode
Filtering Dialog Box x
Building Filter Expressions Using Graphical Interface Building Filter Expressions Manually Filter Expressions in Comparison Mode
Details Dialog Box x
Detailed Attributes of Function Events Detailed Attributes of Message Events Detailed Attributes of Collective Operation Events
Configuration Dialogs x
Load Configuration File Dialog Edit Configuration File Dialog
Settings x
Preferences Font Settings Number Formatting Settings
Preferences x
General Preferences Tracefile Preferences Event Timeline Settings Qualitative Timeline Settings Quantitative Timeline Settings Counter Timeline Settings
Notices and Disclaimers x
Appendix A Copyright and Licenses
Intel® Trace Analyzer and Collector User and Reference Guide

Defining and Recording Counters

Intel® Trace Collector introduces the concept of counters to model numeric performance data that changes over the execution time. Use counters to capture the values of hardware performance counters, or of program variables (iteration counts, convergence rate, etc.) or any other numerical quantity. An Intel Trace Collector counter is identified by its name, the counter class it belongs to (similar to the two-level symbol naming), and the type of its values (integer or floating-point) and the units that the values are quoted in (Example: MFlop/sec).

A counter can be attached to MPI processes to record process-local data, or to arbitrary groups. When using a group, then each member of the group will have its own instance of the counter and when a process logs a value it will only update the counter value of the instance the process belongs to.

Similar to other Intel Trace Collector objects, counters are referred to by integer counter handles that are managed automatically by the library.

To define a counter, the class it belongs to needs to be defined by calling VT_classdef(). Then, call VT_countdef(), and pass the following information:

  • Counter name

  • Data type

enum VT_CountData

Enumerator Description
VT_COUNT_INTEGER Counter measures 64 bit integer value, passed to Intel® Trace Collector API as a pair of high and low 32 bit integers
VT_COUNT_FLOAT Counter measures 64 bit floating point value (native format)
VT_COUNT_INTEGER64 Counter measures 64 bit integer value (native format)
VT_COUNT_DATA Mask to extract the data format

  • Kind of data

enum VT_CountDisplay

Enumerator Description 
VT_COUNT_ABSVAL
 Counter are displayed with absolute values 
VT_COUNT_RATE
 First derivative of counter values is displayed
VT_COUNT_DISPLAY Mask to extract the display type

  • Semantic associated with a sample value

enum VT_CountScope

Enumerator Description 
VT_COUNT_VALID_BEFORE
 The value is valid until and at the current time 
VT_COUNT_VALID_POINT
 The value is valid exactly at the current time, and no value is available before or after it 
VT_COUNT_VALID_AFTER
 The value is valid at and after the current time 
VT_COUNT_VALID_SAMPLE
 The value is valid at the current time and samples a curve, so for example, linear interpolation between sample values is possible 
VT_COUNT_SCOPE
 Mask to extract the scope

  • Counter target, that is the process or group of processes it belongs to (VT_GROUP_THREAD for a thread-local counter, VT_GROUP_PROCESS for a process-local counter, or an arbitrary previously defined group handle)

  • Lower and upper bounds

  • Counter unit (an arbitrary string like FLOP, Mbytes)

VT_countdef

int VT_countdef (const char * name, int classhandle, 
	 int genre, int target, const void * bounds, const char * unit, int 
	 * counterhandle)

Description

Define a counter and get handle for it.

Counters are identified by their name (string) alone.

Fortran 

VTCOUNTDEF(name, classhandle, genre, target, 
	 bounds[], unit, counterhandle, ierr)

Parameters

name string identifying the counter
classhandle class to group counters, handle must have been retrieved by VT_classdef
genre bitwise or of one value from VT_CountScope, VT_CountDisplay and VT_CountData
target target which the counter refers to (VT_ME, VT_GROUP_THREAD, VT_GROUP_PROCESS, VT_GROUP_CLUSTER or thread/process-id or user-defined group handle).
bounds array of lower and upper bounds (2x 64 bit float, 2x2 32 bit integer, 2x 64 bit integer ->16 byte)
unit string identifying the unit for the counter (like Volt, pints etc.)

Return values

counterhandle handle identifying the defined counter

Returns error code

The integer counters have 64-bit integer values, while the floating-point counters have a value domain of 64-bit IEEE floating point numbers. On systems that have no 64-bit integer type in C, and for Fortran, the 64-bit values are specified using two 32-bit integers. Integers and floats are passed in the native byte order, but for VT_COUNT_INTEGER the integer with the higher 32 bits needs to be given first on all platforms:

Counter Value
VT_COUNT_INTEGER

32 bit integer (high)

32 bit integer (low)

VT_COUNT_INTEGER64 64 bit integer
VT_COUNT_FLOAT 64 bit float

At any time during execution, a process can record a new value for any of the defined counters by calling one of the Intel® Trace Collector API routines described below. To minimize the overhead, it is possible to set the values of several counters with one call by passing an integer array of counter handles and a corresponding array of values. In C, it is possible to mix 64-bit integers and 64-bit floating point values in one value array; in Fortran, the language requires that the value array contains either all integer or all floating point values.

VT_countval

int VT_countval(int ncounters, int * handles, 
	 void * values)

Description

Record counter values.

Values are expected as two 4-byte integers, one 8-byte integer or one 8-byte double, according to the counter it refers to.

Fortran

VTCOUNTVAL(ncounters, handles[], values[], 
	 ierr)

Parameters

ncounters number of counters to be recorded
handles array of ncounters many handles (previously defined by VT_countdef)
values array of ncounters many values, value[i] corresponds to handles[i].

Return Values

Returns error code

The online samples resource contains counterscopec.c, which demonstrates all of these facilities.

Parent topic: API Reference
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