From: Martin Kronbichler <kronbichler@lnm.mw.tum.de>
Date: Tue, 29 Dec 2015 20:16:12 +0000 (+0100)
Subject: Change minimum parallel grainsize of vector to power of 2
X-Git-Tag: v8.4.0-rc2~122^2
X-Git-Url: https://gitweb.dealii.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F2027%2Fhead;p=dealii.git

Change minimum parallel grainsize of vector to power of 2
---

diff --git a/source/base/parallel.cc b/source/base/parallel.cc
index 1d794fd30e..284d8deca5 100644
--- a/source/base/parallel.cc
+++ b/source/base/parallel.cc
@@ -34,13 +34,13 @@ namespace internal
     // large to split the work load into
     // enough chunks and the problem becomes
     // badly balanced)
-    unsigned int minimum_parallel_grain_size = 1000;
+    unsigned int minimum_parallel_grain_size = 1024;
   }
 
 
   namespace SparseMatrix
   {
-    // set this value to 1/5 of the value of
+    // set this value to 1/4 of the value of
     // the minimum grain size of
     // vectors. this rests on the fact that
     // we have to do a lot more work per row
@@ -50,7 +50,7 @@ namespace internal
     // worth it any more for anything but
     // very small matrices that we don't care
     // that much about anyway.
-    unsigned int minimum_parallel_grain_size = 200;
+    unsigned int minimum_parallel_grain_size = 256;
   }
 }