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+# Script mem-measurements.sh v1.0.0
+
+## Introduction
+
+This document describes the use of script `mem-measurements.sh v1.0.0`.  
+Please replace variables written in _italic_ with concrete values.
+
+**Background**:
+
+The goal of this script is tracking the memory consumption through the execution of a set of memory debug commands.
+
+## Parameters
+
+The script can be called with one optional parameter _output-dir_.  
+If the script willl be called without parameter, the default value "/opt/mem-measurements" will be used.  
+_output-dir_ will be created, if it doesn't exist.
+  
+## Description  
+
+The script calls the following commands:
+
+- cat /proc/meminfo
+- free -h
+- vmstat
+- ps axo pmem,vsize,rss,pid,euser,cmd | sort -nr | head -n 1000
+
+On each execution the script creates a dat file with the outputs of commands above:
+
+<pre>
+<code>
+<i>output-dir</i>/data/data_YYYY-MM-DD_hh-mm-ss.dat
+</code>
+</pre>
+
+By default the script keeps 168 dat files, which means one week of data if the script is executed once every hour.
+
+## Excecution
+
+The script should be executed by the **root** user and the attributes should be changed to `500`
+```
+# chmod 500 mem-measurements.sh
+# ./mem-measurements.sh
+```
+
+## Cron Job
+
+In order to set `mem-measurements.sh` as a cron job follow these instructions as the **root** user:
+
+In this example the script `mem-measurements.sh` will be executed once every hour at minute 20.
+
+1. Save the script `mem-measurements.sh` in a directory _install-dir_, e.g. `/opt/mem-measurements/`
+2. Change the attributes to `500`
+```
+# chmod 500 mem-measurements.sh
+```
+
+3. Add the record in crontab:
+
+<pre>
+<code>
+# crontab -e
+20 * * * * <i>install-dir</i>/mem-measurements.sh 2>&1 | logger
+</code>
+</pre>
+
+4. The directory _output-dir_/data/ will keep one week of data.
diff --git a/tools/mem-measurements/mem-measurements.sh b/tools/mem-measurements/mem-measurements.sh
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+#!/bin/bash
+ 
+# (C) Copyright 2020 Fujitsu Enabling Software Technology GmbH
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+ 
+###########################
+# mem-measurements v1.0.0 #
+###########################
+ 
+# Uncomment for verbose logging in bash
+#set -x
+ 
+# Set default value for output directory
+outputDataDir="/opt/mem-measurements"
+ 
+# Default amount of max files to keep.
+# With a cron job running each hour: 24h x 7d = 168
+maxAmountFiles=168
+ 
+# Commands to be executed
+declare -a metricNames=(
+                        "cat /proc/meminfo"
+                        "free -h"
+                        "vmstat"
+                        "ps axo pmem,vsize,rss,pid,euser,cmd | sort -nr | head -n 1000"
+                       )
+ 
+##############################
+# Don't edit below this line #
+##############################
+ 
+######### handle input params ##############
+if [ $# -gt 1 ]; then
+   echo "ERROR: illegal number of parameters, expected format: $0 <output directory>"
+   exit 1;
+elif [ $# -eq 1 ]; then
+   outputDataDir=$1
+fi
+
+# Creating output data dir
+mkdir -p $outputDataDir/data
+ 
+if [ $? -ne 0 ]; then
+   echo "$0: ERROR: output directory $outputDataDir/data could not be created"
+   exit 1
+fi
+
+echo "$0: collecting information in directory $outputDataDir"
+
+# Collecting memory status data
+for metricName in "${metricNames[@]}"; do
+    {
+     echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
+     echo "+ COMMAND: $metricName"
+     echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
+     eval "$metricName"
+     echo -e "\n"
+    } &>> tmpdata.dat
+done
+ 
+mv tmpdata.dat $outputDataDir/data/"data_$(date +%Y-%m-%d_%H-%M-%S).dat"
+ 
+# Removing old data files
+((maxAmountFiles++))
+# shellcheck disable=SC2012
+ls $outputDataDir/data/data_*.dat -t | tail -n +"$maxAmountFiles" | xargs -I {} rm {}