Installing Oprofile

The easiest way to profile Ceph's CPU consumption is to use the oprofile system-wide profiler.

Installation

If you are using a Debian/Ubuntu distribution, you can install oprofile by executing the following:

sudo apt-get install oprofile oprofile-gui

Compiling Ceph for Profiling

To compile Ceph for profiling, first clean everything.

git clean -dfx

Finally, compile Ceph.

    ./do-cmake.sh -DCMAKE_CXX_FLAGS="-fno-omit-frame-pointer -O2 -g"
cd build
cmake --build .

In this command, CMAKE_CXX_FLAGS is specified. This provides callgraph output.

Ceph Configuration

Ensure that you disable lockdep. Consider setting logging to levels appropriate for a production cluster. See Ceph Logging and Debugging for details.

See the CPU Profiling section of the RADOS Troubleshooting documentation for details on using Oprofile.