write: 13.40 MB/s read: 27.27 MB/sNote: above 1 MB/s corresponds to 1024*1024 bytes/s. In dd 1 MB/s corresponds to 1000*1000 bytes/s. Interesting to note is that the
sync mount option kills the performance, therefore the script:
#!/bin/bash
GB_COUNT=3
GB_SIZE=1000
MOUNT_OPTIONS="-o flush,uid=$UID"
flash_device=$1
flash_mount_point=/tmp/$RANDOM
READSPEED=0
WRITESPEED=0
function mount_flash {
mounted=$(mount -l | grep $flash_device)
if [ -z "$mounted" ]
then
echo "mounting..."
sudo mount $MOUNT_OPTIONS $flash_device $flash_mount_point
fi
}
function umount_flash {
UNMOUNTING=$(date +%s)
mounted=$(mount -l | grep $flash_device)
while [ ! -z "$mounted" ]
do
echo "unmounting $flash_device ..."
sudo umount $flash_device
mounted=$(mount -l | grep $flash_device)
done
UNMOUNTED=$(date +%s)
echo "! device $flash_device unmounted in $(($UNMOUNTED-$UNMOUNTING)) sec"
}
function init {
mkdir -p $flash_mount_point
if [ -z "$flash_device" ] || [ ! -b "$flash_device" ]
then
echo "Invalid device specified:[$flash_device]"
exit
fi
umount_flash
mount_flash
echo ""
echo " Read/Write Benchmark"
echo "=============================="
echo "! device: $flash_device"
echo "! mounted: $(sudo mount -l | grep $flash_device)"
echo "!"
echo "=============================="
echo ""
}
function write_test {
mount_flash
START=$(date +%s)
for i in $(seq 1 1 $GB_COUNT)
do
echo " writing $GB_SIZE MB: $i of $GB_COUNT"
dd count=$GB_SIZE bs=1M if=/dev/zero of=$flash_mount_point/test.$i
done
echo "! unmounting.."
umount_flash
END=$(date +%s)
TIME=$(($END-$START))
echo "! writting $(($GB_COUNT*$GB_SIZE)) MB done in: $TIME sec"
echo ""
integ=$(($GB_SIZE*$GB_COUNT/$TIME))
frac=$((100*$GB_SIZE*$GB_COUNT/$TIME-100*$integ))
WRITESPEED=$integ.$frac
echo "! write: $WRITESPEED MB/s"
}
function read_test {
mount_flash
START=$(date +%s)
for i in $(seq 1 1 $GB_COUNT)
do
echo " reading $GB_SIZE MB: $i of $GB_COUNT"
dd count=1000 bs=1M of=/dev/null if=$flash_mount_point/test.$i
done
umount_flash
END=$(date +%s)
TIME=$(($END-$START))
echo "! reading $(($GB_COUNT*$GB_SIZE)) MB done in: $TIME sec"
echo ""
integ=$(($GB_SIZE*$GB_COUNT/$TIME))
frac=$((100*$GB_SIZE*$GB_COUNT/$TIME-100*$integ))
READSPEED=$integ.$frac
echo "! read: $READSPEED MB/s"
}
init
write_test
read_test
echo "======================"
echo " Benchmark Result:"
echo ""
echo " write: $WRITESPEED MB/s"
echo " read: $READSPEED MB/s"
echo ""
echo "======================"
Worth reading - http://www.hjreggel.net/cardspeed
