From 5292ef36bfc005e69bd07992e50b3481b53eb7bb Mon Sep 17 00:00:00 2001
From: mattijs <mattijs>
Date: Wed, 14 Dec 2016 09:17:29 +0000
Subject: [PATCH] ENH: controlDict: extended comment
---
etc/controlDict | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/etc/controlDict b/etc/controlDict
index 1334cc1bb1e..067fa7361d3 100644
--- a/etc/controlDict
+++ b/etc/controlDict
@@ -62,6 +62,15 @@ OptimisationSwitches
floatTransfer 0;
nProcsSimpleSum 0;
+ // Optional max size (bytes) for unstructured data exchanges. In some
+ // phases of OpenFOAM it can send over very large data chunks
+ // (e.g. in parallel load balancing) and some Pstream implementations have
+ // problems with this. Setting this variable > 0 indicates that the
+ // data exchange needs to be done in multiple passes, each of maxCommsSize.
+ // This is not switched on by default since it requires an additional
+ // global reduction, even if multi-pass is not needed)
+ maxCommsSize 0;
+
// Force dumping (at next timestep) upon signal (-1 to disable)
writeNowSignal -1; // 10;
--
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