Record memory usage of a process

memlog.sh

#!/usr/bin/env bash

# usage: memlog.sh $(pidof PROCESS_NAME) [ PATH_FOLDER ]

# on osx pidof can be replaced by pgrep
# usage: memlog.sh $(pgrep PROCESS_NAME) [ PATH_FOLDER ]

set -e

PID=$1
FOLDER=$2
LOG=./$PID.csv

echo recording memory usage of $PID

echo -n 'cpu,rss' > $LOG

if [[ -n "$FOLDER" ]]; then
    echo recording $FOLDER disk usage
    echo -n ',disk' >> $LOG
fi

echo >> $LOG

echo log file: $LOG

while kill -0 $PID; do

    if [[ -z "$FOLDER" ]]; then
        ps -p $PID -o\%cpu,rss | awk 'NR>1 { gsub(",",".",$1); printf $1","$2}' >> $LOG
    else
        ps -p $PID -o\%cpu,rss | awk 'NR>1 { gsub(",",".",$1); printf $1","$2}' >> $LOG
        printf ',' >> $LOG
        du -sm $FOLDER | cut -f -1 >> $LOG
    fi

    sleep 0.2
done