[cig-commits] commit: Notes for parallel performance writing

[Mercurial]

changeset:   125:3231eab98c1b
parent:      123:9a339f379222
user:        Matthew G Knepley <knepley at gmail.com>
date:        Tue May 15 18:56:14 2012 -0400
files:       faultRup.tex
description:
Notes for parallel performance writing


diff -r 9a339f379222 -r 3231eab98c1b faultRup.tex
--- a/faultRup.tex	Thu May 10 17:17:47 2012 -0400
+++ b/faultRup.tex	Tue May 15 18:56:14 2012 -0400
@@ -1213,6 +1213,15 @@ number of iterations required for conver
 number of iterations required for convergence.
 
 \matt{Add additional comments, explanation of performance}
+Sources of load imbalance:
+  unstructured partition (1.3)
+  Dirichlet conditions (2.2)
+  fault unknowns (3)
+Reasons to eliminate unknowns
+
+
+Competition between integration and solve for balance
+
 
 \subsection{Parallel Scaling Performance}
 
@@ -1257,6 +1266,10 @@ the number of iterates increases strongl
 the number of iterates increases strongly with process count. The introduction of
 Schur complement methods and AMG slows the growth considerably, but future work will
 pursue the ultimate goal of iteration counts independent of process number.
+
+Separately plot VecMDot and MatMult
+This shows that increasing iterates have a penalty from sync VecMDot, and MatMult scales
+better. Could tradeoff with iterative method like BCGS.
 
 % ------------------------------------------------------------------
 \section{Code Verification Benchmarks}