Otf2

This branch adds a basic support for the OTF2 trace format. The main interesting events are supported (function entry/exit, MPI P2P communication, metrics) and I was able to open medium-sized traces (up to 500MB) on my laptop (for larger traces, you'll need lots of RAM, or a few optimizations in the code).

The code is stable enough and ViTE is usable on most OTF2 traces, so I think it's time to merge it into the master branch.

cmake/FindOTF2.cmake

+#
+# Find the OTF2 libraries and include dir
+#
+
+# OTF2_INCLUDE_DIR  - Directories to include to use OTF2
+# OTF2_LIBRARY    - Files to link against to use OTF2
+# OTF2_FOUND        - When false, don't try to use OTF2
+#
+# OTF2_DIR can be used to make it simpler to find the various include
+# directories and compiled libraries when OTF2 was not installed in the
+# usual/well-known directories (e.g. because you made an in tree-source
+# compilation or because you installed it in an "unusual" directory).
+# Just set OTF2_DIR it to your specific installation directory
+#
+FIND_LIBRARY(OTF2_LIBRARY otf2
+  PATHS
+  /usr/lib
+  /usr/local/lib
+  ${OTF2_DIR}/lib
+)
+
+IF(OTF2_LIBRARY)
+  GET_FILENAME_COMPONENT(OTF2_GUESSED_INCLUDE_DIR_tmp "${OTF2_LIBRARY}" PATH)
+  STRING(REGEX REPLACE "lib$" "include" OTF2_GUESSED_INCLUDE_DIR "${OTF2_GUESSED_INCLUDE_DIR_tmp}")
+ENDIF(OTF2_LIBRARY)
+
+FIND_PATH( OTF2_INCLUDE_DIR otf2/otf2.h
+  PATHS
+  ${OTF2_GUESSED_INCLUDE_DIR}
+  ${OTF2_DIR}/include
+  /usr/include
+  /usr/local/include
+  ${CMAKE_SOURCE_DIR}/externals/otf2/include/
+)
+
+IF( OTF2_INCLUDE_DIR )
+  IF( OTF2_LIBRARY )
+    SET( OTF2_FOUND "YES" )
+    MARK_AS_ADVANCED( OTF2_DIR )
+    MARK_AS_ADVANCED( OTF2_INCLUDE_DIR )
+    MARK_AS_ADVANCED( OTF2_LIBRARY )
+  ENDIF( OTF2_LIBRARY )
+ENDIF( OTF2_INCLUDE_DIR )
+
+IF( NOT OTF2_FOUND )
+  MESSAGE("OTF2 installation was not found. Please provide OTF2_DIR:")
+  MESSAGE("  - through the GUI when working with ccmake, ")
+  MESSAGE("  - as a command line argument when working with cmake e.g. ")
+  MESSAGE("    cmake .. -DOTF2_DIR:PATH=/usr/local/otf ")
+  MESSAGE("Note: the following message is triggered by cmake on the first ")
+  MESSAGE("    undefined necessary PATH variable (e.g. OTF2_INCLUDE_DIR).")
+  MESSAGE("    Providing OTF2_DIR (as above described) is probably the")
+  MESSAGE("    simplest solution unless you have a really customized/odd")
+  MESSAGE("    OTF2 installation...")
+  SET(OTF2_DIR "" CACHE PATH "Root of OTF2 install tree." )
+ENDIF( NOT OTF2_FOUND )