Program to benchmark hardlink creation using rsync

hardtest.sh

#!/usr/bin/env bash

function p {
    echo `date --rfc-3339=ns` "$@"
}

BASEDIR=`pwd`/hardtest

SOURCEDIR=$BASEDIR/dfs
SNAPDIR=$BASEDIR/dfs-snap
LINKDIR=$BASEDIR/dfs-link

NUMDIRS=12
NUMSUBDIRS=100
NUMFILES=100

p "Creating subdir and subfile hierarchy"

for i in `seq 1 $NUMDIRS`; do
    for j in `seq 1 $NUMSUBDIRS`; do
        mkdir -p $SOURCEDIR/subdir$i/subdir$j
        for k in `seq 1 $NUMFILES`; do
            touch $SOURCEDIR/subdir$i/subdir$j/file$k &
            wait
        done
        wait
    done
    p "Created subdir $i of $NUMDIRS"
done

p "Creating initial snapshot for rsync"

rsync -a $SOURCEDIR/ $SNAPDIR/

p "Creating hardlinks via rsync --link-dest"

START=$(date '+%s%N')

for i in `seq 1 $NUMDIRS`; do
    mkdir -p $LINKDIR/subdir$i
    rsync -a --link-dest=$SNAPDIR/subdir$i/ $SOURCEDIR/subdir$i/ $LINKDIR/subdir$i/ &
done
wait

END=$(date '+%s%N')

p "Finished making hardlinks"

NUMLINKS=`find $LINKDIR -type f | wc -l`
DURATION=$(expr $END - $START)
RATE=`echo "$NUMLINKS/($DURATION/1000000000)" | bc -l`

p "Number of links:      " $NUMLINKS
p "Hardlink time (ns):   " $DURATION
p "Throughput (links/s): " $RATE