Add region probe infrastructure

The region probes are divided in three levels:
- User probes: defined by the user using ttg::user_probe; compile with -DTTG_ENABLE_USER_PROBES=1 to enable.
- Task probes: task execution instrumentation using names provided to ttg::Op; compile with -DTTG_ENABLE_TASK_PROBES=1 to enable.
- Internal probes: all the gory runtime-internal details; compile with -DTTG_ENABLE_INTERNAL_PROBES=1 to enable.

At the moment, the latter two are only available in the PaRSEC backend.
User probes can be defined any time and work with any backend that uses PaRSEC.

To enable tracing in PaRSEC, users have to export the following two
environment variables:
- PARSEC_MCA_mca_pins=task_profiler
- PARSEC_MCA_profile_filename=<filename> (files must not exist)

Signed-off-by: Joseph Schuchart <schuchart@icl.utk.edu>

Author: devreal

ttg/CMakeLists.txt

@@ -13,6 +13,7 @@ set(ttg-util-headers
         ${CMAKE_CURRENT_SOURCE_DIR}/ttg/util/macro.h
         ${CMAKE_CURRENT_SOURCE_DIR}/ttg/util/meta.h
         ${CMAKE_CURRENT_SOURCE_DIR}/ttg/util/print.h
+        ${CMAKE_CURRENT_SOURCE_DIR}/ttg/util/region_probe.h
         ${CMAKE_CURRENT_SOURCE_DIR}/ttg/util/span.h
         ${CMAKE_CURRENT_SOURCE_DIR}/ttg/util/trace.h
         ${CMAKE_CURRENT_SOURCE_DIR}/ttg/util/tree.h

ttg/ttg/madness/ttg.h

@@ -21,6 +21,7 @@
 #include "ttg/util/meta.h"
 #include "ttg/util/void.h"
 #include "ttg/world.h"
+#include "ttg/util/region_probe.h"
 
 #include <array>
 #include <cassert>
@@ -126,6 +127,11 @@ namespace ttg_madness {
     std::shared_ptr<ttg::base::WorldImplBase> world_sptr{static_cast<ttg::base::WorldImplBase *>(world_ptr)};
     ttg::World world{std::move(world_sptr)};
     ttg::detail::set_default_world(std::move(world));
+
+    /* initialize probes */
+    ttg::detail::region_probe<ttg::detail::TTG_REGION_PROBE_INTERNAL>::register_deferred_probes();
+    ttg::detail::region_probe<ttg::detail::TTG_REGION_PROBE_TASKS>::register_deferred_probes();
+    ttg::detail::region_probe<ttg::detail::TTG_REGION_PROBE_USER>::register_deferred_probes();
   }
   inline void ttg_finalize() {
     ttg::detail::set_default_world(ttg::World{});  // reset the default world