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- Added command-line option -i.

Browse Source 
- Added additional columns with average transfer speed in MB/s, the
  standard deviation for this average, and the number of IOPS.


git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@897 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Bart Van Assche
2009-06-11 18:59:00 +00:00
parent 0bb8a456dd
commit 5c4a41b656
1 changed files with 37 additions and 14 deletions
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51
scripts/blockdev-perftest
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@@ -27,9 +27,10 @@
#########################
function usage {
echo "Usage: $0 [-a] [-d] [-n] [-r] [-s <l2s>] <dev>"
echo "Usage: $0 [-a] [-d] [-i <i>] [-n] [-r] [-s <l2s>] <dev>"
echo " -a - use asynchronous (buffered) I/O."
echo " -d - use direct (non-buffered) I/O."
echo " -i - number times each test is iterated."
echo " -n - do not verify the data on <dev> before overwriting it."
echo " -r - only perform the read test."
echo " -s - logarithm base two of the I/O size."
@@ -43,11 +44,19 @@ function drop_caches {
fi
}
# Read times in seconds from stdin, one number per line, echo each number
# using format $1, and also echo the average transfer size in MB/s, its
# standard deviation and the number of IOPS using the total I/O size $2 and
# the block transfer size $3.
function echo_and_calc_avg {
awk -v fmt="$1" -v iosize="$2" -v blocksize="$3" '{if ($1 != 0){n++;sum+=iosize/$1;sumsq+=iosize*iosize/($1*$1)};printf fmt, $1} END{d=(n>0?sumsq/n-sum*sum/n/n:0);avg=(n>0?sum/n:0);stddev=(d>0?sqrt(d):0);iops=avg/blocksize;printf fmt fmt fmt,avg/2**20,stddev/2**20,iops}'
}
#########################
# Default settings #
#########################
iterations=3
log2_io_size=30 # 1 GB
log2_min_blocksize=9 # 512 bytes
log2_max_blocksize=26 # 64 MB
@@ -60,12 +69,13 @@ verify_device_data=true
# Argument processing #
#########################
set -- $(/usr/bin/getopt "adnrs:" "$@")
set -- $(/usr/bin/getopt "adi:nrs:" "$@")
while [ "$1" != "${1#-}" ]
do
case "$1" in
'-a') iotype="buffered"; shift;;
'-d') iotype="direct"; shift;;
'-i') iterations="$2"; shift; shift;;
'-n') verify_device_data="false"; shift;;
'-r') read_test_only="true"; shift;;
'-s') log2_io_size="$2"; shift; shift;;
@@ -111,8 +121,21 @@ else
dd_iflags=""
fi
printf "%9s %8s %8s %8s %8s %8s %8s\n" blocksize W W W R R R
# Header
printf "%9s " blocksize
for ((i = 0; i < ${iterations}; i++))
do
printf "%6s " "W(s)"
done
printf "%6s %6s %6s" "W(avg,MB/s)" "W(stddev,MB/s)" "W(IOPS)"
for ((i = 0; i < ${iterations}; i++))
do
printf "%6s " "R(s)"
done
printf "%6s %6s %6s" "R(avg,MB/s)" "R(stddev,MB/s)" "R(IOPS)"
printf "\n"
# Measurements
for ((log2_blocksize = log2_max_blocksize;
log2_blocksize >= log2_min_blocksize;
log2_blocksize--))
@@ -120,28 +143,28 @@ do
if [ $log2_blocksize -gt $log2_io_size ]; then
continue
fi
iosize=$((2**log2_io_size))
bs=$((2**log2_blocksize))
count=$((2**(log2_io_size - log2_blocksize)))
printf "%9d " ${bs}
for ((i=0;i<3;i++))
for ((i = 0; i < ${iterations}; i++))
do
if [ "${read_test_only}" = "false" ]; then
drop_caches
elapsed="$(dd if=/dev/zero of="${device}" bs=${bs} count=${count} \
dd if=/dev/zero of="${device}" bs=${bs} count=${count} \
${dd_oflags} 2>&1 \
| sed -n 's/.* \([0-9.]*\) s,.*/\1/p')"
| sed -n 's/.* \([0-9.]*\) s,.*/\1/p'
else
elapsed=-1
echo 0
fi
printf "%8s " "${elapsed}"
done
for ((i=0;i<3;i++))
done | echo_and_calc_avg "%8g " ${iosize} ${bs}
for ((i = 0; i < ${iterations}; i++))
do
drop_caches
elapsed="$(dd if="${device}" of=/dev/null bs=${bs} count=${count} \
dd if="${device}" of=/dev/null bs=${bs} count=${count} \
${dd_iflags} 2>&1 \
| sed -n 's/.* \([0-9.]*\) s,.*/\1/p')"
printf "%8s " "${elapsed}"
done
| sed -n 's/.* \([0-9.]*\) s,.*/\1/p'
done | echo_and_calc_avg "%8g " ${iosize} ${bs}
printf "\n"
done