From 8540b2a85db31d168da8151bc5c682a5e340d74c Mon Sep 17 00:00:00 2001
From: Peter Boyle <paboyle@ph.ed.ac.uk>
Date: Thu, 28 May 2026 14:04:38 -0400
Subject: [PATCH] Test_extended_meson_field: add view_open timers to measure
 MemoryManager H2D transfers

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 tests/Test_extended_meson_field.cc | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/tests/Test_extended_meson_field.cc b/tests/Test_extended_meson_field.cc
index 484d72d8..5f605863 100644
--- a/tests/Test_extended_meson_field.cc
+++ b/tests/Test_extended_meson_field.cc
@@ -664,11 +664,20 @@ public:
     Vector<Gamma::Algebra> gamma1(gamma1_in.begin(), gamma1_in.end());
     Vector<Gamma::Algebra> gamma2(gamma2_in.begin(), gamma2_in.end());
 
+    t0 = usecond();
+    for (auto &f : loop1) { autoView(v, f, AcceleratorRead); }
+    for (auto &f : loop2) { autoView(v, f, AcceleratorRead); }
+    std::cout << GridLogMessage << tag << " view_open_loop:  " << Tms(usecond()-t0) << " ms\n";
+
     t0 = usecond();
     PropagatorField loop(grid);
     A2ALoopPropagator(loop, loop1, loop2);
     std::cout << GridLogMessage << tag << " loop_build:      " << Tms(usecond()-t0) << " ms\n";
 
+    t0 = usecond();
+    for (int i = 0; i < N_i; i++) { autoView(v, left[i], AcceleratorRead); }
+    std::cout << GridLogMessage << tag << " view_open_left:  " << Tms(usecond()-t0) << " ms\n";
+
     t0 = usecond();
     std::vector<FermionField> leftv(N_i, grid);
     for (int i = 0; i < N_i; i++)
@@ -686,6 +695,11 @@ public:
     }
     std::cout << GridLogMessage << tag << " tloop:           " << Tms(usecond()-t0) << " ms\n";
 
+    t0 = usecond();
+    { autoView(tlv, tloop, AcceleratorRead); }
+    for (int j = 0; j < N_j; j++) { autoView(rv, right[j], AcceleratorRead); }
+    std::cout << GridLogMessage << tag << " view_open_right: " << Tms(usecond()-t0) << " ms\n";
+
     t0 = usecond();
     std::vector<FermionField> loopRight(N_j, grid);
     for (int j = 0; j < N_j; j++) {