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

IBM Software Group | Rational software Agenda  Introduction  Installation  Components  Usage

IBM Software Group | Rational software 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

IBM Software Group | Rational software Installation  PurifyPlus Installer Need Passport Advantage (PA) Credentials - Company Primary contact, Technical Contact will have the information  PurifyPlus Licenses - Need PurifyPlusUNIX Licenses - Floating, Nodelocked, Named User

IBM Software Group | Rational software 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

IBM Software Group | Rational software 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

IBM Software Group | Rational software 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

IBM Software Group | Rational software 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

IBM Software Group | Rational software 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.

IBM Software Group | Rational software 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

IBM Software Group | Rational software

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

IBM Software Group | Rational software 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

IBM Software Group | Rational software Pure Coverage  Purecoverage script reports - Coverage Summary Report - Low Coverage Reports - Differences Report  ey/index.html ey/index.html  Provides merge option to merge the results purecov -merge=result.pcv -force-merge a.pcv b.pcv

IBM Software Group | Rational software 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.

IBM Software Group | Rational software 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

IBM Software Group | Rational software 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

IBM Software Group | Rational software 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

IBM Software Group | Rational software 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

IBM Software Group | Rational software 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

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