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Improved dd benchmark: handle non-megabyte results correctly

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This commit is contained in:
Nils Steinger 2017-05-08 22:03:22 +02:00
parent 392f537da0
commit 8fdffdd9f6
1 changed files with 41 additions and 11 deletions
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52
nench.sh
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@ -23,6 +23,39 @@ Bps_to_MiBps()
awk '{ printf "%.2f MiB/s\n", $0 / 1024 / 1024 } END { if (NR == 0) { print "error" } }'
}
finish()
{
rm -f test_$$
exit
}
# make sure the dd test file is always deleted, even when the script is
# interrupted while dd is running
trap finish EXIT INT TERM
dd_benchmark()
{
# returns IO speed in B/s
# Temporarily override locale to deal with non-standard decimal separators
# (e.g. "," instead of ".").
# The awk script assumes bytes/second if the suffix is !~ [TGMK]B. Call me
# if your storage system does more than terabytes per second; I'll want to
# see that.
LC_ALL=C dd if=/dev/zero of=test_$$ bs=64k count=16k conv=fdatasync 2>&1 | \
awk -F, '
{
io=$NF
}
END {
if (io ~ /TB\/s/) {print 1000*1000*1000*1000*io}
else if (io ~ /GB\/s/) {print 1000*1000*1000*io}
else if (io ~ /MB\/s/) {print 1000*1000*io}
else if (io ~ /KB\/s/) {print 1000*io}
else { print 1*io}
}'
rm -f test_$$
}
if ! command_exists curl
then
printf '%s\n' 'This script requires curl, but it could not be found.' 1>&2
@ -115,21 +148,18 @@ printf '\n'
# dd disk test
printf 'dd test\n'
io1=$( ( dd if=/dev/zero of=test_$$ bs=64k count=16k conv=fdatasync && rm -f test_$$ ) 2>&1 | awk -F, '{io=$NF} END { print io}' | sed 's/^[ \t]*//;s/[ \t]*$//' )
printf ' 1st run: %s\n' "$io1"
io1=$( dd_benchmark )
printf ' 1st run: %s\n' "$(printf '%d\n' "$io1" | Bps_to_MiBps)"
io2=$( ( dd if=/dev/zero of=test_$$ bs=64k count=16k conv=fdatasync && rm -f test_$$ ) 2>&1 | awk -F, '{io=$NF} END { print io}' | sed 's/^[ \t]*//;s/[ \t]*$//' )
printf ' 2nd run: %s\n' "$io2"
io2=$( dd_benchmark )
printf ' 2nd run: %s\n' "$(printf '%d\n' "$io2" | Bps_to_MiBps)"
io3=$( ( dd if=/dev/zero of=test_$$ bs=64k count=16k conv=fdatasync && rm -f test_$$ ) 2>&1 | awk -F, '{io=$NF} END { print io}' | sed 's/^[ \t]*//;s/[ \t]*$//' )
printf ' 3rd run: %s\n' "$io3"
io3=$( dd_benchmark )
printf ' 3rd run: %s\n' "$(printf '%d\n' "$io3" | Bps_to_MiBps)"
# Calculating avg I/O (better approach with awk for non int values)
ioraw1=$( echo $io1 | awk 'NR==1 {print $1}' )
ioraw2=$( echo $io2 | awk 'NR==1 {print $1}' )
ioraw3=$( echo $io3 | awk 'NR==1 {print $1}' )
ioavg=$( awk 'BEGIN{print int(('$ioraw1' + '$ioraw2' + '$ioraw3')/3)}' )
printf ' average: %d MB/s\n' "$ioavg"
ioavg=$( awk 'BEGIN{print int(('"$io1"' + '"$io2"' + '"$io3"')/3)}' )
printf ' average: %s\n' "$(printf '%d\n' "$ioavg" | Bps_to_MiBps)"
printf '\n'