]> https://gitweb.dealii.org/ - dealii-svn.git/commitdiff
Comment on timing.
authorbangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Wed, 20 Aug 2008 16:54:44 +0000 (16:54 +0000)
committerbangerth <bangerth@0785d39b-7218-0410-832d-ea1e28bc413d>
Wed, 20 Aug 2008 16:54:44 +0000 (16:54 +0000)
git-svn-id: https://svn.dealii.org/trunk@16613 0785d39b-7218-0410-832d-ea1e28bc413d

deal.II/examples/step-31/doc/intro.dox

index 0e5d0790721ee46533e2c371e1ef1436d714b8e0..a50ff82ba9e26c9b50ce4c93d2a439827b187403 100644 (file)
@@ -894,3 +894,18 @@ the values of the Stokes shape functions, but also the Hessians of the
 temperature shape functions &mdash; much cheaper indeed, and as it turns out:
 assembling the right hand side of the temperature equation is now a component
 of the program that is hardly measurable.
+
+With these changes, timing the program yields that only the following
+operations are relevant for the overall run time: 
+<ul>
+  <li>Solving the Stokes system: 72% of the run time.
+  <li>Assembling the Stokes preconditioner and computing the algebraic
+      multigrid hierarchy using the Trilinos ML package: 11% of the
+      run time.
+  <li>The function <code>BoussinesqFlowProblem::setup_dofs</code>: 7%
+      of overall run time.
+  <li>Assembling the Stokes and temperature right hand side vectors as
+      well as assembling the matrices: 7%.
+</ul>
+In essence this means that all bottlenecks apart from the algebraic
+multigrid have been removed.

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