How to compare two oprofile collected stats/logs

Hi,

To debug a performance issue, I ran the oprofile on working image and
faulty image.

root> opcontrol --start --no-vmlinux --separate=lib --callgraph 5
<run the application>
root> opcontrol –-stop
root> opcontrol --dump
root> opreport -l
root> opcontrol --shutdown

Now i have both working and faulty image stats, how to compare both?

root> opreport  /flash/oprofile_working_image /flash/oprofile_issue_image
Using /var/lib/oprofile/samples/ for samples directory.
WARNING! The OProfile kernel driver reports sample buffer overflows.
Such overflows can result in incorrect sample attribution, invalid sample
files and other symptoms.  See the oprofiled.log for details.
You should adjust your sampling frequency to eliminate (or at least
minimize)
these overflows.
error: no sample files found: profile specification too strict ?


Please provide the input.

Thanks in advance.

Nagesh

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