Adding upstream version 18.2.2.upstream/18.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 46 insertions, 0 deletions

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+=====================
+ Installing Oprofile
+=====================
+
+The easiest way to profile Ceph's CPU consumption is to use the `oprofile`_
+system-wide profiler.
+
+.. _oprofile: http://oprofile.sourceforge.net/about/
+
+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.
+
+.. _Ceph Logging and Debugging: ../../rados/troubleshooting/log-and-debug
+
+See the `CPU Profiling`_ section of the RADOS Troubleshooting documentation for details on using Oprofile.
+
+
+.. _CPU Profiling: ../../rados/troubleshooting/cpu-profiling