Question

Is there possibility to show what’s going on under specified process in Linux?

For example, i run SQL query -> select evil_function();
and notice that process under Linux uses all cpu.

So is there something with what I can see whats going on under this process?

What I want is to see what queries is running under this process.

Thanks!

Answer 1

strace will tell you what system calls the process is making.

To see what called routines are taking the most CPU, you need to run a profiling tool, and make sure the executable of the process you in compiled correctly (sometimes it needs to be instrumented during compilation for profiling, sometimes it just needs to be compiled with debug symbols, or not stripped of them after compilation).

You might want to look at oprofile, valgrind, gprof and for starters on free tools – there are also commercial products available.

Here are a few links:

http://www.pixelbeat.org/programming/profiling/

http://en.wikipedia.org/wiki/List_of_performance_analysis_tools