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Program to benchmark hardlink creation using rsync
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#!/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 |
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