® IBM Software Group © 2006 IBM Corporation PurifyPlus on Linux / Unix Vinay Kumar H S.

®

IBM Software Group

© 2006 IBM Corporation

PurifyPlus on Linux / Unix

Vinay Kumar H S

IBM Software Group | Rational software

Agenda

Introduction

Installation

Components

Usage


Introduction

Memory debugging: pinpoints hard to find memory errors such as uninitialized

memory access, buffer overflow, and improper freeing of memory

Memory leak detection : identifies memory blocks that no longer have a valid

pointer

Performance profiling: highlights application performance bottlenecks and

improves application understanding with a graphical representation of function

calls

Code coverage: identifies untested code with line-level precision


Installation

PurifyPlus Installer

- http://www-01.ibm.com/support/docview.wss?&uid=swg21315781

- Need Passport Advantage (PA) Credentials

- Company Primary contact , Technical Contact will have the information

PurifyPlus Licenses

- Need PurifyPlusUNIX Licenses

- Floating , Nodelocked, Named User


Installation

Setup the License Server

Run rs_install to install the tool

Run Post_Install script

Source the file- purifyplus_setup.sh to set the path


Purify Usage

Test the sample provided with the installation

Instrumentation could be done in either way

- purify cc -g hello_world.c

- purify cc -g hello_world.o ( cc -c -g hello_world.c)

In make files, as above just append purify at link line

Purify command cannot be used to generate .so or .a


Purify Usage

purify cc –g hello_world.c

purify –log-file=./sample.log cc –g hello_world.c

purify –view-file=./sampleview.pv cc –g hello_world.c

purify –view sampleview.pv


Purify Usage

Can suppress messages

Can specify where to suppress the message making the report more meaning full

Can use JIT or the purified output with Debugger

Many Run time , Build Time options exist


Purify Usage

Purify maintains a table to track the status of each byte of memory used by

your program.

The table contains two bits that represent each byte of memory.

The first bit records whether the corresponding byte has been allocated

The second bit records whether the memory has been initialized.


Purify Usage

Purify uses these two bits to describe four states of memory:

Red, Yellow, Green, and Blue

Illegal to read, write, or free red and blue memory

Yellow could be written or freed but should not be read

Green could be Read or Written


PureCoverage Usage

Helps Identify Untested Code

purecov cc -g hello_world.c

Provides Line Level and Function level Coverage information

Provides option to view annotated source with coverage information


Pure coverage

Can make Adjustments to get the practical data analysis

Provides option to view the result file on Windows

-view-file-format = both

- .pcv

-view-file-format = windows

- .cfy


Pure Coverage

Purecoverage script reports

- Coverage Summary Report

- Low Coverage Reports

- Differences Report

http://www.ibm.com/developerworks/rational/library/edge/08/oct08/srivastava_mcvey/index.html

Provides merge option to merge the results

purecov -merge=result.pcv -force-merge a.pcv b.pcv


Quantify

Quantify Provides the time measure required for the execution of Application,its module, its functions

Quantify uses Object Code Insertion (OCI)technology to count the instructions your program executes and to compute how many cycles they require to execute.

Quantify instruments and reports performance data for all the code in your program, including system and third-party libraries, shared libraries, and statically linked modules.

Quantify times system calls – Wall clock time ( System time)

Since Quantify counts cycles, it gives you accurate data at any scale.


Quantify Usage

quantify cc -g hello_world.c

Analysis could be done using various kind of information

Function List Window

Function Detail Window

Call Graph Window

Annotated Source Window


Qunatify Usage

Function List provides the list of function which has its share in the overall time

Function List can be sorted

Function List can be restricted


Quantify Usage

Call graph provides different functions on the graph with varying line thickness

The thickness of the line is directly proportional to the time taken by that function to execute

Provides an option to focus on specific functions , descendants


Quantify Usage

The Function Detail window presents detailed performance data for a single function, its contribution to the overall execution of the program

Function + Descendant value could also be calculated

Quantify can display recorded performance data in cycles (the number of

machine cycles) and in microseconds, milliseconds, or seconds

Various scaling levels are possible .00 , .000


Quantify Usage

The Annotated source window provides the Line wise performance data

The Annotated Source window is available only for files that you

compile using the -g debugging option

Annotations show how function+descendants time was distributed over

its source lines


Demo


Questions?


Thank You !!!

® IBM Software Group © 2006 IBM Corporation PurifyPlus on Linux / Unix Vinay Kumar H S.

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Transcript of ® IBM Software Group © 2006 IBM Corporation PurifyPlus on Linux / Unix Vinay Kumar H S.