commit 42a84b87fa5cc34551244a3b2b6a3e1f13a29514
author Sameer Agarwal <sameeragarwal@google.com> Fri Feb 01 12:22:53 2013 -0800
committer Sameer Agarwal <sameeragarwal@google.com> Wed Feb 06 01:00:38 2013 -0800
tree 4e80e679828c82af1807a71d9acd723f99cbefda
parent 08c891fcb6ea1bf66e6d4619273765a644605dfc

Expand reporting of timing information.

1. Add an ExecutionSummary object to record execution
   information about Ceres objects.
2. Add an EventLogger object to log events in a function call.
3. Add a ScopedExecutionTimer object to log times in ExecutionSummary.
4. Instrument ProgramEvaluator and all the linear solvers
   to report their timing statistics.
5. Connect the timing statistics to Summary::FullReport.
6. Add high precision timer on unix systems using
   gettimeofday() call.
7. Various minor clean ups all around.

Change-Id: I5e09804b730b09535484124be7dbc1c58eccd1d4

internal/ceres/dense_qr_solver.cc

diff --git a/internal/ceres/dense_qr_solver.cc b/internal/ceres/dense_qr_solver.cc
index 7aec450..21b6b15 100644
--- a/internal/ceres/dense_qr_solver.cc
+++ b/internal/ceres/dense_qr_solver.cc
@@ -34,10 +34,11 @@
 
 #include "Eigen/Dense"
 #include "ceres/dense_sparse_matrix.h"
-#include "ceres/linear_solver.h"
 #include "ceres/internal/eigen.h"
 #include "ceres/internal/scoped_ptr.h"
+#include "ceres/linear_solver.h"
 #include "ceres/types.h"
+#include "ceres/wall_time.h"
 
 namespace ceres {
 namespace internal {
@@ -50,10 +51,10 @@
     const double* b,
     const LinearSolver::PerSolveOptions& per_solve_options,
     double* x) {
+  EventLogger event_logger("DenseQRSolver::Solve");
+
   const int num_rows = A->num_rows();
   const int num_cols = A->num_cols();
-  VLOG(2) << "DenseQRSolver: "
-          << num_rows << " x " << num_cols << " system.";
 
   if (per_solve_options.D != NULL) {
     // Temporarily append a diagonal block to the A matrix, but undo
@@ -68,9 +69,11 @@
     rhs_.setZero();
   }
   rhs_.head(num_rows) = ConstVectorRef(b, num_rows);
+  event_logger.AddEvent("Setup");
 
   // Solve the system.
   VectorRef(x, num_cols) = A->matrix().colPivHouseholderQr().solve(rhs_);
+  event_logger.AddEvent("Solve");
 
   if (per_solve_options.D != NULL) {
     // Undo the modifications to the matrix A.
@@ -83,6 +86,8 @@
   LinearSolver::Summary summary;
   summary.num_iterations = 1;
   summary.termination_type = TOLERANCE;
+
+  event_logger.AddEvent("TearDown");
   return summary;
 }