Appendix E. gprof helper
In this appendix
gprof helper Module for Multithreaded Applications
gprof, when used with multithreaded applications on certain kernels (such as Linux), profiles only the main thread. To work around this situation, we include the gprof helper module from http://sam.zoy.org/writings/programming/gprof.html. Basically, gprof uses the internal ITIMER_PROF timer, which makes the kernel deliver a signal to the application whenever it expires. This module passes this timer data to all spawned threads.
To use the module, compile the following:
$ gcc -shared -fPIC gprof-helper.c -o gprof-helper.so -lpthread -ldl
Type the following in the command line:
$ LD_PRELOAD=./gprof-helper.so ...
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