Add KNC affinity wrapper example

gpaw/examples/affinity_wrapper.sh

+#!/bin/bash
+# An affinity wrapper for KNCs.
+#   As arguments, it expects first the number of processes per node
+#   followed by the command to run (and any possible arguments to it).
+
+# get some information about the job
+ppn=$1
+shift
+rank=$PMI_RANK
+nmpi=$PMI_SIZE
+
+# echo "RANK", $PMI_RANK
+
+# number of devices in the system
+ndev=2
+
+# number of cores per device
+nphcores=61
+nphcores=$((nphcores - 1))
+
+# number of threads per physical core
+tpc=4
+
+# ranks per device
+rpd=$((ppn / ndev))
+if [ "$rpd" == "0" ]; then
+    rpd=1
+fi
+
+# physical cores per device
+ncores=$((nphcores / rpd))
+
+# partition number of the current rank on its device
+partition=$((rank % rpd))
+
+# offset for the current rank
+offset=$((ncores * partition))
+
+# build core selection string
+select="${ncores}c,${tpc}t,${offset}o"
+
+# fire up the actual run
+log="affinity-`printf %03d $rank`.log"
+rm -f $log
+echo "host `hostname` rank `printf %03d $rank` - $select " |& tee -a $log
+env | grep PYMIC |& tee -a $log
+PYMIC_KMP_AFFINITY=compact,verbose PYMIC_KMP_PLACE_THREADS=$select $@ |& tee -a $log