Adjust fullnode/drone oom_score_adj to goad the kernel into killing it first

multinode-demo/common.sh

@@ -173,6 +173,21 @@ tune_networking() {
   fi
 }
 
+oom_score_adj() {
+  declare pid=$1
+  declare score=$2
+  if [[ $(uname) != Linux ]]; then
+    return
+  fi
+
+  (
+    echo "$score" > "/proc/$pid/oom_score_adj"
+    if [[ $score != $(cat "/proc/$pid/oom_score_adj") ]]; then
+      echo "Failed to set oom_score_adj for pid $pid"
+    fi
+  )
+}
+
 SOLANA_CONFIG_DIR=${SNAP_DATA:-$PWD}/config
 SOLANA_CONFIG_PRIVATE_DIR=${SNAP_DATA:-$PWD}/config-private
 SOLANA_CONFIG_VALIDATOR_DIR=${SNAP_DATA:-$PWD}/config-validator

multinode-demo/drone.sh

@@ -42,4 +42,5 @@ $solana_drone \
   -l "$SOLANA_CONFIG_DIR"/leader.json -k "$SOLANA_CONFIG_PRIVATE_DIR"/mint.json \
   > >($drone_logger) 2>&1 &
 pid=$!
+oom_score_adj "$pid" 1000
 wait "$pid"

multinode-demo/leader.sh

@@ -31,4 +31,5 @@ $program \
   --ledger "$SOLANA_CONFIG_DIR"/ledger \
   > >($leader_logger) 2>&1 &
 pid=$!
+oom_score_adj "$pid" 1000
 wait "$pid"

multinode-demo/validator.sh

@@ -108,4 +108,5 @@ $program \
   --ledger "$SOLANA_LEADER_CONFIG_DIR"/ledger \
   > >($validator_logger) 2>&1 &
 pid=$!
+oom_score_adj "$pid" 1000
 wait "$pid"