Add server memory usage monitoring script

scripts/srv-mem.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+
+# Print out drawpile-srv's memory usage.
+# Output consists of timestamp + process number and the following columns:
+# - Maximum resident set size (waterline)
+# - Current resident set size
+# - Swapped out virtual memory size
+
+PIDS=$(pgrep drawpile-srv)
+
+if [ -z "$PIDS" ]
+then
+	exit
+fi
+
+NOW=$(date -Iseconds)
+
+for PID in $PIDS
+do
+	echo -n "$NOW [$PID]; "
+	egrep "^Vm(HWM|RSS|Swap)" /proc/$PID/status | awk '{ printf "%s %s; ", $2, $3 }'
+	echo
+done
+