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- Added command-line options -a, -d, -n and -s.
- If the syntax of the command-line options is incorrect, a usage text
  is displayed.
- Bug fix: log2_io_size is now honored even if the target device is larger
  than the specified size.


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@747 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2009-04-04 09:12:20 +00:00
parent e62b39196b
commit 5687a49e80
1 changed files with 70 additions and 6 deletions
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scripts/blockdev-perftest
+70 -6
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@@ -22,10 +22,59 @@
#
############################################################################
device="$1"
log2_io_size=31 # 2 GB
#########################
# Function definitions #
#########################
function usage {
echo "Usage: $0 [-a] [-d] [-n] [-s <l2s>] <dev>"
echo " -a - use asynchronous (buffered) I/O."
echo " -d - use direct (non-buffered) I/O."
echo " -n - do not verify the data on <dev> before overwriting it."
echo " -s - logarithm base two of the I/O size."
echo " <dev> - block device to run the I/O performance test on."
}
#########################
# Default settings #
#########################
log2_io_size=30 # 1 GB
log2_min_blocksize=12 # 4096 bytes
log2_max_blocksize=26 # 64 MB
iotype=direct
verify_device_data=true
#########################
# Argument processing #
#########################
set -- $(/usr/bin/getopt "adns:" "$@")
while [ "$1" != "${1#-}" ]
do
case "$1" in
'-a') iotype="buffered"; shift;;
'-d') iotype="direct"; shift;;
'-n') verify_device_data="false"; shift;;
'-s') log2_io_size="$2"; shift; shift;;
'--') shift;;
*) usage; exit 1;;
esac
done
if [ "$#" != 1 ]; then
usage
exit 1
fi
device="$1"
####################
# Performance test #
####################
if [ ! -e "${device}" ]; then
echo "Error: device ${device} does not exist."
@@ -37,26 +86,41 @@ if [ ! -w "${device}" ]; then
exit 1
fi
if ! cmp -s -n $((2**log2_io_size)) "${device}" /dev/zero; then
if [ "${verify_device_data}" = "true" ] \
&& ! cmp -s -n $((2**log2_io_size)) "${device}" /dev/zero
then
echo "Error: device ${device} still contains data."
exit 1
fi
if [ "${iotype}" = "direct" ]; then
dd_oflags="oflag=direct"
dd_iflags="iflag=direct"
else
dd_oflags="oflag=sync"
dd_iflags=""
fi
printf "%9s %8s %8s %8s %8s %8s %8s\n" blocksize W W W R R R
for ((log2_blocksize = log2_max_blocksize; log2_blocksize >= log2_min_blocksize; log2_blocksize--))
for ((log2_blocksize = log2_max_blocksize;
log2_blocksize >= log2_min_blocksize;
log2_blocksize--))
do
bs=$((2**log2_blocksize))
count=$((2**(log2_io_size - log2_blocksize)))
printf "%9d " ${bs}
for ((i=0;i<3;i++))
do
elapsed="$(dd if=/dev/zero of="${device}" bs=${bs} oflag=direct 2>&1 \
elapsed="$(dd if=/dev/zero of="${device}" bs=${bs} count=${count} \
${dd_oflags} 2>&1 \
| sed -n 's/.* \([0-9.]*\) s,.*/\1/p')"
printf "%8s " "${elapsed}"
done
for ((i=0;i<3;i++))
do
elapsed="$(dd if="${device}" of=/dev/null bs=${bs} iflag=direct 2>&1 \
elapsed="$(dd if="${device}" of=/dev/null bs=${bs} count=${count} \
${dd_iflags} 2>&1 \
| sed -n 's/.* \([0-9.]*\) s,.*/\1/p')"
printf "%8s " "${elapsed}"
done