Friday, March 26, 2010

Debugging QUALNET with GDB

Compiling QualNet with Debug Option
By default, the optimization option of the compiler is enabled in the Linux and Mac OS X Makefiles. When the optimization option is enabled, the compiler may optimize the program for better performance. However, for better source level debugging, the optimization option of the compiler should be disabled and the debug option should be enabled.
Perform following steps to recompile QualNet with the debug option enabled:
1. Go to QUALNET_HOME/main. Copy the makefile for your compiler to Makefile.
2.Edit Makefile as follows:
•Enable the DEBUG line by removing the ‘#’ character so it is displayed as:
DEBUG = -g
•Disable the OPT line by inserting a ‘#’ character at the beginning of the line so it is displayed as:
# OPT = -O3
3.Recompile QualNet by typing the following commands:
make clean

Running the Debugger
QualNet can be run from within debug tools such as gdb or dbx. Here, we use gdb as an example.
To run gdb, perform the following steps:
1. Open a command window. Go to the directory where the scenario to be debugged is located.
2.Load the QualNet executable into gdb by typing the following command (this assumes that QualNet is installed in /home/username/qualnet/5.0):
gdb /home/username/qualnet/5.0/bin/qualnet
3.From within the gdb environment, run your scenario in gdb by typing the following command (assuming the scenario configuration file is myscenario.config):
run myscenario.config
4.To exit gdb, type following command in gdb:
Refer to gdb user manual for more information on how to debug a program in gdb.

Taken from

To get the value of the current variables use
print name_of_the_variable

To see where the function is called from:

Friday, March 12, 2010

Regular expression for the functions

If you wanna have something like

int thisFunction(int a,
int b)

to be turned into

int thisFunction(int a,
int b)
printf("thisFunction Started");

You can search for functions using the following regular expression:




Replace with:

\0 // \1 Started\r\nprintf("\1 Started");


\0 // \3 Started\r\nprintf("\3 Started");