From: Berk Hess <hess@kth.se>
Date: Thu, 12 Feb 2015 14:58:11 +0000 (+0100)
Subject: Fix div by zero in PP/PME ratio
X-Git-Url: http://biod.pnpi.spb.ru/gitweb/?a=commitdiff_plain;h=de8c51206e47597a55a6e2b4d069851d5018c95b;p=alexxy%2Fgromacs.git

Fix div by zero in PP/PME ratio

Since we have floating pointing exceptions by default with debug
builds, these no longer ran with separate PME ranks.

Change-Id: I8b15a93901495dbde5dff959001c52ada7414008
---

diff --git a/src/gromacs/domdec/domdec.cpp b/src/gromacs/domdec/domdec.cpp
index 43a2d6d854..e593445135 100644
--- a/src/gromacs/domdec/domdec.cpp
+++ b/src/gromacs/domdec/domdec.cpp
@@ -5563,7 +5563,7 @@ static float dd_f_imbal(gmx_domdec_t *dd)
 
 float dd_pme_f_ratio(gmx_domdec_t *dd)
 {
-    if (dd->comm->cycl_n[ddCyclPME] > 0)
+    if (dd->comm->load[0].mdf > 0 && dd->comm->cycl_n[ddCyclPME] > 0)
     {
         return dd->comm->load[0].pme/dd->comm->load[0].mdf;
     }