81 lines
1.6 KiB
Bash
81 lines
1.6 KiB
Bash
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#!/bin/sh
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dir=/tmp
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filesize=100 # megabytes
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numfiles=128
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nocache=
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interleave=
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blocksize=262144
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needfiles=1
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while [ $# -gt 1 ] ; do
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case $1 in
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-d) dir=$2; shift; shift ;;
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-f) filesize=$2; shift; shift ;;
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-n) numfiles=$2; shift; shift ;;
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-N) nocache="-s"; shift; shift ;;
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-b) blocksize=$2; shift; shift ;;
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esac
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done
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if [ -d $dir -a -f $dir/testfile_1 ] ; then
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# dir exists and has a testfile within it - reuse to avoid
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# recreating files
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echo "Re-using files in $dir"
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needfiles=
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else
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dir=$dir/readtest_$$
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mkdir $dir
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if [ $? != 0 ] ; then
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echo "Cannot create testfile directory $dir"
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exit 1
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fi
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fi
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if [ x$needfiles != x ] ; then
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if [ x$interleave = x ] ; then
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#
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# Create all files sequentially
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#
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for i in `seq 1 $numfiles` ; do
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dd of=$dir/testfile_$i if=/dev/zero bs=1M count=$filesize
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echo $i
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done
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else
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#
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# Create files interleaved, adding $blocksize to each
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# file in turn.
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#
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size=0
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limit=`expr $filesize * 1048576`
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while [ $size -lt $limit ] ; do
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for i in `seq 1 $numfiles` ; do
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dd if=/dev/zero bs=$blocksize count=1 >> $dir/testfile_$i
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done
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size=`expr $size + $blocksize`
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echo "Files now @ $size bytes"
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done
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fi
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fi
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if uname -a | grep -s arwin ; then
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# clears cache on OS X
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sudo purge
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elif [ -f /proc/sys/vm/drop_cache ] ; then
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# Linux cache clearing
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echo 3 | sudo tee /proc/sys/vm/drop/cache >/dev/null
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else
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# need an alternative for other operating systems
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:
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fi
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echo "Ready to run ..."
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./readtest $nocache -b $blocksize -q $dir/testfile_%d
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