Memory usage tracking script for swift runs.

mem_usage.sh

#!/bin/bash                                                                                                                                            


get_last_swift()
{
    ps -u $USER | grep swift | head -n 1 | awk -F ' ' '{print $1}'
}

timestamp()
{
    #UNIXTIMESTAMP                                                                                                                                     
    #date +"%s"                                                                                                                                        
    date -u
}

track_mem_usage()
{
    PID=$(get_last_swift)
    echo "last swift : $PID"
    [ ! -z $1 ] && PID=$1

    JAVAPID=($(pgrep -P $PID))

    CPID=($(pstree -p $PID | head -n 1  | grep -o "\([0-9]*\)"))
    PID_STRING=""
    for pid in ${CPID[*]}
    do
        PID_STRING="$PID_STRING -p $pid "
    done

    pstree -p $PID | head -n 1
    echo "Tracking PIDs: $PID_STRING"
    echo "===================================================="
    while :
    do
        ps -p $PID &> /dev/null
        [ $? != 0 ] && break
        #timestamp                                                                                                                                     
        #top -b -n 1 $PID_STRING | awk 'java {print $* systime()}'                                                                                     
        top -b -n 1 $PID_STRING | tail -n +8  | sed '/^$/d' | sed -e "s/^/$(date +"%T")\ /"
        sleep 2
    done
}

track_mem_usage $1  | tee mem_usage.$RANDOM.log