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#!/bin/bash
#
# Benchmark the read/write performance of pv by looking at the number of
# read() and write() calls and the average amount of data transferred each
# time, as suggested by Ville Herva <Ville.Herva@iki.fi>.
#
test_input=`mktemp /tmp/pvbench1XXXXXX`
strace_output=`mktemp /tmp/pvbench2XXXXXX`
trap "rm -f ${test_input} ${strace_output}" 0
pv=${pv:-./pv}
test -x ${pv} || pv=pv
dd if=/dev/zero of=${test_input} bs=1k count=1k >/dev/null 2>&1
echo -e "Buf(k)\tRate(k)\tReads\tRsize\tWrites\tWsize"
for ((buffer=100; buffer<=1000; buffer+=100)); do
for ((rate=0; rate<=1000; rate+=100)); do
rateparm="-L ${rate}k"
test ${rate} -eq 0 && rateparm=""
strace -tt -o ${strace_output} \
${pv} ${rateparm} -B ${buffer}k \
-f < ${test_input} > /dev/null 2>&1
rdata=$(
awk '$2~/^read\(0,/{c++;t+=$NF}END{print c "\t" t/c}' \
${strace_output}
)
wdata=$(
awk '$2~/^write\(1,/{c++;t+=$NF}END{print c "\t" t/c}' \
${strace_output}
)
echo -e "${buffer}\t${rate}\t${rdata}\t${wdata}"
done
done
# EOF
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