#1382: add test skeleton for lb histogram

tests/unit/collection/test_lb_histogram.cc

@@ -0,0 +1,171 @@
+/*
+//@HEADER
+// *****************************************************************************
+//
+//                          test_lb_histogram.cc
+//                       DARMA/vt => Virtual Transport
+//
+// Copyright 2019-2021 National Technology & Engineering Solutions of Sandia, LLC
+// (NTESS). Under the terms of Contract DE-NA0003525 with NTESS, the U.S.
+// Government retains certain rights in this software.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// * Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// * Redistributions in binary form must reproduce the above copyright notice,
+//   this list of conditions and the following disclaimer in the documentation
+//   and/or other materials provided with the distribution.
+//
+// * Neither the name of the copyright holder nor the names of its
+//   contributors may be used to endorse or promote products derived from this
+//   software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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+// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+// POSSIBILITY OF SUCH DAMAGE.
+//
+// Questions? Contact [email protected]
+//
+// *****************************************************************************
+//@HEADER
+*/
+
+#include <vt/vrt/collection/balance/col_lb_data.h>
+#include <vt/vrt/collection/balance/model/persistence_median_last_n.h>
+#include <vt/vrt/collection/balance/model/load_model.h>
+#include <vt/vrt/collection/balance/lb_invoke/lb_manager.h>
+#include <vt/vrt/collection/types/type_aliases.h>
+#include <vt/vrt/collection/manager.h>
+#include <vt/vrt/collection/balance/stats_msg.h>
+
+#include <gtest/gtest.h>
+#include "test_helpers.h"
+#include "test_parallel_harness.h"
+
+#include <memory>
+
+namespace vt { namespace tests { namespace unit {
+
+template <typename ColT>
+struct MyMsg : vt::CollectionMessage<ColT> { };
+
+struct TestCol : vt::Collection<TestCol,vt::Index1D> {
+  unsigned int prev_calls_ = 0;
+
+  unsigned int prevCalls() { return prev_calls_++; }
+
+  static void colHandler(MyMsg<TestCol>* msg, TestCol* col) {
+    fmt::print("format_print_debug_test_col");
+    auto& lb_data = col->lb_data_;
+    auto load_phase_count = lb_data.getLoadPhaseCount();
+    auto comm_phase_count = lb_data.getCommPhaseCount();
+    auto sp_load_phase_count = lb_data.getSubphaseLoadPhaseCount();
+    auto sp_comm_phase_count = lb_data.getSubphaseCommPhaseCount();
+
+    #if vt_check_enabled(lblite)
+      auto phase = col->prevCalls();
+      auto model = theLBManager()->getLoadModel();
+      auto phases_needed = model->getNumPastPhasesNeeded();
+      if (phase > phases_needed) {
+        // updatePhase will have caused entries to be added for the
+        // next phase already
+        EXPECT_EQ(load_phase_count,    phases_needed + 1);
+        EXPECT_EQ(sp_load_phase_count, phases_needed + 1);
+        EXPECT_EQ(comm_phase_count,    phases_needed + 1);
+        EXPECT_EQ(sp_comm_phase_count, phases_needed + 1);
+      } else if (phase == 0) {
+        EXPECT_EQ(load_phase_count,    phase);
+        EXPECT_EQ(sp_load_phase_count, phase);
+        EXPECT_EQ(comm_phase_count,    phase);
+        EXPECT_EQ(sp_comm_phase_count, phase);
+      } else {
+        // updatePhase will have caused entries to be added for the
+        // next phase already
+        EXPECT_EQ(load_phase_count,    phase + 1);
+        EXPECT_EQ(sp_load_phase_count, phase + 1);
+        EXPECT_EQ(comm_phase_count,    phase + 1);
+        EXPECT_EQ(sp_comm_phase_count, phase + 1);
+      }
+    #else
+      EXPECT_EQ(load_phase_count,    0);
+      EXPECT_EQ(sp_load_phase_count, 0);
+      EXPECT_EQ(comm_phase_count,    0);
+      EXPECT_EQ(sp_comm_phase_count, 0);
+    #endif
+  }
+};
+
+using TestLBHistogram = TestParallelHarness;
+
+using vt::vrt::collection::balance::LoadModel;
+using vt::vrt::collection::balance::PersistenceMedianLastN;
+
+static constexpr int32_t const num_elms = 16;
+
+
+//TODO
+//Create a collection
+//do some work (thereby calling computeStatistics)
+//verify reduction of histogram is successful
+//Done
+
+TEST_F(TestLBHistogram, test_lbhistogram) {
+  static constexpr int const num_phases = 5;
+  SET_MIN_NUM_NODES_CONSTRAINT(2);
+
+  auto this_node = vt::theContext()->getNode();
+  auto num_nodes = static_cast<int32_t>(theContext()->getNumNodes());
+
+
+
+  // We must have more or equal number of elements than nodes for this test to
+  // work properly
+  EXPECT_GE(num_elms, vt::theContext()->getNumNodes());
+
+  auto range = vt::Index1D(num_elms);
+
+  vt::vrt::collection::CollectionProxy<TestCol> proxy;
+  if(this_node == 0){std::cout<<"1st I am in the test. I ran\n";}
+
+  // Construct two collections
+  runInEpochCollective([&]{
+    proxy = vt::theCollection()->constructCollective<TestCol>(
+      range, "test_lbhistogram"
+    );
+  });
+
+  // Get the base model, assert it's valid
+  auto base = theLBManager()->getBaseLoadModel();
+  EXPECT_NE(base, nullptr);
+
+  // Create a new model
+  auto persist = std::make_shared<PersistenceMedianLastN>(base, 1U);
+
+  // Set the new model
+  theLBManager()->setLoadModel(persist);
+  for (int i=0; i<num_phases; ++i) {
+    runInEpochCollective([&]{
+      // Do some work.
+      //this calls theLBManager()->computeStatistics(persist, false, phase, stats_cb);
+      proxy.broadcastCollective<MyMsg<TestCol>, &TestCol::colHandler>();
+    });
+    // Go to the next phase.
+    vt::thePhase()->nextPhaseCollective();
+  }
+  auto phase = vt::thePhase()->getCurrentPhase();
+  //TODO: access histogram and verify it's correct
+
+}
+
+}}} // end namespace vt::tests::unit