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+FIO
+===
+
+Ceph uses the fio workload generator and benchmarking utility.
+(https://github.com/axboe/fio.git)
+
+FIO tool is automatically fetched to build/src/fio, and build if necessary.
+
+RBD
+---
+
+The fio engine for rbd is located in the fio tree itself, so you'll need to
+build it from source.
+
+If you install the ceph libraries to a location that isn't in your
+LD_LIBRARY_PATH, be sure to add it:
+
+    export LD_LIBRARY_PATH=/path/to/install/lib
+
+To build fio with rbd:
+
+    ./configure --extra-cflags="-I/path/to/install/include -L/path/to/install/lib"
+    make
+
+If configure fails with "Rados Block Device engine   no", see config.log for
+details and adjust the cflags as necessary.
+
+If ceph was compiled with tcmalloc, it may be necessary to compile fio with:
+    make EXTLIBS=tcmalloc
+Otherwise fio might crash in malloc_usable_size().
+
+To view the fio options specific to the rbd engine:
+
+    ./fio --enghelp=rbd
+
+See examples/rbd.fio for an example job file. To run:
+
+    ./fio examples/rbd.fio
+
+ObjectStore
+-----------
+
+This fio engine allows you to mount and use a ceph object store directly,
+without having to build a ceph cluster or start any daemons.
+
+Because the ObjectStore is not a public-facing interface, we build it inside
+of the ceph tree and load libfio_ceph_objectstore.so into fio as an external
+engine.
+
+To build fio_ceph_objectstore run:
+```
+  ./do_cmake.sh -DWITH_FIO=ON
+  cd build
+  make fio_ceph_objectstore
+```
+This will fetch FIO to build/src/fio directory,
+compile fio tool and libfio_ceph_objectstore.so.
+
+If you install the ceph libraries to a location that isn't in your
+LD_LIBRARY_PATH, be sure to add it:
+
+    export LD_LIBRARY_PATH=/path/to/install/lib
+
+To view the fio options specific to the objectstore engine:
+
+    ./fio --enghelp=libfio_ceph_objectstore.so
+
+The conf= option requires a ceph configuration file (ceph.conf). Example job
+and conf files for each object store are provided in the same directory as
+this README.
+
+To run:
+
+    ./fio /path/to/job.fio
+
+RADOS
+-----
+
+By default FIO can be compiled with support for RADOS.
+When ceph is installed in your system default compilation of FIO includes RADOS ioengine.
+If you installed ceph in any other place (cmake -DCMAKE_INSTALL_PREFIX=${CEPH_INSTALL_ROOT} ..) you can build FIO following way:
+
+    LIBS="-lrados -ltcmalloc" LDFLAGS="-L${CEPH_INSTALL_ROOT}/lib" EXTFLAGS="-I${CEPH_INSTALL_ROOT}/include" \
+    rados=yes ./configure
+    LIBS="-lrados -ltcmalloc" LDFLAGS="-L${CEPH_INSTALL_ROOT}/lib" EXTFLAGS="-I${CEPH_INSTALL_ROOT}/include" \
+    rados=yes make
+
+"-ltcmalloc" is necessary if ceph was compiled with tcmalloc.