123 lines
4.4 KiB
Bash
Executable file
123 lines
4.4 KiB
Bash
Executable file
# this is a quick and dirty script to run a netperf TCP_RR and
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# TCP_STREAM test concurrently to allow one to see the effect of
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# buffer bloat on latency. We assume that netperf has been compiled
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# with demo-mode enabled via ./configure --enable-demo
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NETPERF=`which netperf`
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if [ $? -ne 0 ]
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then
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echo "Unable to find a netperf binary."
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exit -1
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fi
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CHUNK=60
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# first, start the TCP_RR test
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RR_START=`date +%s`
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echo "Starting netperf TCP_RR at $RR_START" | tee bloat.log
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# a negative value for the demo interval (-D) will cause netperf to
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# make gettimeofday() calls after every transaction. this will result
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# in more accurate demo intervals once the STREAM test kicks-in, but a
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# somewhat lower transaction rate. not unlike enabling histogram
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# mode.
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netperf -H $1 -l 7200 -t TCP_RR -D -0.5 -v 2 -- -r 1 2>&1 > netperf_rr.out &
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# sleep CHUNK seconds
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sleep $CHUNK
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# now run the TCP_STREAM test
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STREAM_START=`date +%s`
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echo "Starting netperf TCP_STREAM test at $STREAM_START" | tee -a bloat.log
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netperf -H $1 -l `expr $CHUNK \* 2` -t TCP_STREAM -D 0.25 -v 2 -- -m 1K 2>&1 > netperf_stream.out
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STREAM_STOP=`date +%s`
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echo "Netperf TCP_STREAM test stopped at $STREAM_STOP" | tee -a bloat.log
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# sleep another CHUNK seconds
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sleep $CHUNK
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pkill -ALRM netperf
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RR_STOP=`date +%s`
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echo "Netperf TCP_RR test stopped at $RR_STOP" | tee -a bloat.log
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RRDTOOL=`which rrdtool`
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if [ $? -ne 0 ]
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then
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echo "Unable to find rrdtool. You will have to post-process the results by hand"
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exit 0
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fi
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MIN_TIMESTAMP=`grep Interim netperf_rr.out | head -1 | awk '{print int($10)}'`
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MAX_TIMESTAMP=`grep Interim netperf_rr.out | tail -1 | awk '{print int($10)}'`
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MAX_INTERVAL=`grep Interim netperf_rr.out | awk 'BEGIN{max=0.0} ($6 > max) {max = $6}END{print int(max) + 1}'`
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LENGTH=`expr $MAX_TIMESTAMP - $MIN_TIMESTAMP`
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$RRDTOOL create netperf_rr.rrd --step 1 --start $MIN_TIMESTAMP \
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DS:tps:GAUGE:$MAX_INTERVAL:U:U RRA:AVERAGE:0.5:1:$LENGTH
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# now fill it
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awk -v rrdtool=$RRDTOOL '($1 == "Interim"){printf("%s update netperf_rr.rrd %.3f:%f\n",rrdtool,$10,$3)}' netperf_rr.out | sh
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# now post process the tcp_stream test. we could use STREAM_START and
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# STREAM_STOP but these will be just a bit more accurate
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STREAM_MIN_TIMESTAMP=`grep Interim netperf_stream.out | head -1 | awk '{print int($10)}'`
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STREAM_MAX_TIMESTAMP=`grep Interim netperf_stream.out | tail -1 | awk '{print int($10)}'`
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STREAM_MAX_INTERVAL=`grep Interim netperf_stream.out | awk 'BEGIN{max=0.0} ($6 > max) {max = $6}END{print int(max) + 1}'`
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STREAM_LENGTH=`expr $STREAM_MAX_TIMESTAMP - $STREAM_MIN_TIMESTAMP`
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$RRDTOOL create netperf_stream.rrd --step 1 --start $STREAM_MIN_TIMESTAMP \
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DS:mbps:GAUGE:$STREAM_MAX_INTERVAL:U:U RRA:AVERAGE:0.5:1:$STREAM_LENGTH
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# now fill it
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awk -v rrdtool=$RRDTOOL '($1 == "Interim"){printf("%s update netperf_stream.rrd %.3f:%f\n",rrdtool,$10,$3)}' netperf_stream.out | sh
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# now graph it. we want to make sure the chart is at least 800 pixels
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# wide, and has enough pixels for every data point
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WIDTH=$LENGTH
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if [ $WIDTH -lt 800 ]
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then
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WIDTH=800
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fi
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SIZE="-w $WIDTH -h 400"
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# we want to find the scaling factor for the throughput, with the goal
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# being that latency can go to the top of the charts and throughput
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# will go half-way up
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MAXLATMAXBPS=`$RRDTOOL graph /dev/null \
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--start $MIN_TIMESTAMP --end $MAX_TIMESTAMP \
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DEF:trans=netperf_rr.rrd:tps:AVERAGE \
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CDEF:latency=1.0,trans,/ \
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VDEF:maxlatency=latency,MAXIMUM \
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DEF:mbps=netperf_stream.rrd:mbps:AVERAGE \
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CDEF:bps=mbps,2000000,\* \
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VDEF:maxbps=bps,MAXIMUM \
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PRINT:maxlatency:"%.20lf" \
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PRINT:maxbps:"%.20lf" | sed 1d`
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# should I check the completion status of the previous command?
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# probably :)
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SCALE=`echo $MAXLATMAXBPS | awk '{print $2/$1}'`
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$RRDTOOL graph bloat.svg --imgformat SVG \
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$SIZE \
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--lower-limit 0 \
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--start $MIN_TIMESTAMP --end $MAX_TIMESTAMP \
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-t "Effect of bulk transfer on latency to $1" \
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-v "Seconds" \
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--right-axis $SCALE:0 \
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--right-axis-label "Bits per Second" \
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DEF:trans=netperf_rr.rrd:tps:AVERAGE \
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CDEF:latency=1.0,trans,/ \
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LINE2:latency#00FF0080:"TCP_RR Latency" \
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DEF:mbps=netperf_stream.rrd:mbps:AVERAGE \
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CDEF:bps=mbps,1000000,\* \
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CDEF:sbps=bps,$SCALE,/ \
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LINE2:sbps#0000FFF0:"TCP_STREAM Throughput" \
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VRULE:${STREAM_START}#FF000080:"TCP_STREAM start" \
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VRULE:${STREAM_STOP}#00000080:"TCP_STREAM stop" \
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--x-grid SECOND:10:SECOND:60:SECOND:60:0:%X
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