iolat.sh

#!/bin/bash

SECONDS=5

bail() {
        echo "Error: $@"
        exit 1
}
DIR=`mktemp -d`
cd $DIR || bail "temp directory failure"


DARGS=()
        for disk in `ls /dev/sd*[^0-9]` ; do
                DARGS+=('-d')
                DARGS+=($disk)
        done

shopt -s nullglob

maybe_comma() {
        local V=`eval "echo "'$'"$1"`
        if [[ $V -ne 0 ]]; then
                echo -n ","
        fi
        eval "$1=1"
}
while true; do
        blktrace -w $SECONDS -o auto ${DARGS[@]} 2>&1 > /dev/null
        btt -i auto.blktrace.0 --q2c-latencies=lat --q2d-latencies=lat --d2c-latencies=lat 2>&1 > /dev/null

        COMMA=0
        echo -n "{"

        for file in lat_*_q2c.dat; do
                maybe_comma COMMA
                DEV=`echo $file | sed -e 's/^lat_//' -e 's/_q2c.dat//' -e s'/[,:]/./g'`
                echo -n "\"io_latency|ST[dev:$DEV]\":{\"_type\":\"n\",\"_value\":["
                LISTC=0
                for lat in `cat $file | awk '{ print $2; }'` ; do
                        maybe_comma LISTC
                        echo -n "$lat"
                done
                echo -n "]"
        done

        for file in lat_*_q2d.dat; do
                maybe_comma COMMA
                DEV=`echo $file | sed -e 's/^lat_//' -e 's/_q2d.dat//' -e s'/[,:]/./g'`
                echo -n "\"io_latency_q2d|ST[dev:$DEV]\":{\"_type\":\"n\",\"_value\":["
                LISTC=0
                for lat in `cat $file | awk '{ print $2; }'` ; do
                        maybe_comma LISTC
                        echo -n "$lat"
                done
                echo -n "]"
        done

        for file in lat_*_d2c.dat; do
                maybe_comma COMMA
                DEV=`echo $file | sed -e 's/^lat_//' -e 's/_q2d.dat//' -e s'/[,:]/./g'`
                echo -n "\"io_latency_d2c|ST[dev:$DEV]\":{\"_type\":\"n\",\"_value\":["
                LISTC=0
                for lat in `cat $file | awk '{ print $2; }'` ; do
                        maybe_comma LISTC
                        echo -n "$lat"
                done
                echo -n "]"
        done

        echo "}"
        echo

        rm -f *dat *.0
done

cd /
rm -rf $DIR