Monitor the memory usage of given process

mem_chk.sh

#!/bin/bash

# Configure by yourself
procname="cagent"
duration=10

usage()
{
    echo "$0 {process name} {duration}"
    echo "By default:"
    echo "  process name is 'cagent'"
    echo "  duration is '10' sencods"
}

# Parse parameters
[ ! -z "$1" ] && procname="$1"
[ ! -z "$2" ] && duration="$2"

now=$(date +%Y%m%d%H%M%S)
outputfile="mem_for_${procname}_${now}.csv"

# Print usage
[ "-h" == "$procname" ] && usage && exit 1

# CPU cores
cpu_cores="$(($(grep -w processor /proc/cpuinfo | tail -n 1 | awk '{print $3}') + 1))"
{
    echo "CPU Cores,$cpu_cores,,"
    echo ",,,"
} >> "$outputfile"


echo "Date,Pid,VmSize(KB),CPU%"  >> "$outputfile"
while true; do
    # Get pid
    pid_list=$(pgrep "$procname")
    [ -z "$pid_list" ] && echo "PID is null" && exit 1

    #get VMsize
    for pid in $pid_list; do
        echo -n "$(date +"%Y-%m-%d %H:%M:%S"), " >> "$outputfile"
        echo -n "$pid," >> "$outputfile"
        mem=$(grep VmSize "/proc/$pid/status")
        mem2=$(echo  "$mem" | grep -o '[0-9]\+')
        echo -n "$mem2," >> "$outputfile"

        #get the pid CPU Usage
        cpu=$(top -n 1 -p "$pid" | tail -2 | head -1 | awk '{ssd=NF-4} {print $ssd}')
        echo "$cpu," >> "$outputfile"
    done

    sleep "$duration"
done