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- Generate a latency plot PNG file in /tmp/latency-plot.png. - Generate a latency summary file in /tmp/latency-summary.log. Related-to: TOR-1198 Signed-off-by: Ming Liu <ming.liu@toradex.com>
64 lines
1.5 KiB
Bash
Executable File
64 lines
1.5 KiB
Bash
Executable File
#!/bin/bash
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# Run cyclictest
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if ! cyclictest -S -p99 -i1000 -m -D12h -h400 -q >output; then
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echo "ERROR: cyclictest failed" >&2
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exit 1
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fi
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# Get maximum latency
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max=`grep "Max Latencies" output | tr " " "\n" | sort -n | tail -1 | sed s/^0*//`
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# Grep data lines, remove empty lines and create a common field separator
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grep -v -e "^#" -e "^$" output | tr " " "\t" >histogram
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# Create two-column data sets with latency classes and frequency values for each core
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cores=$(grep -c ^processor /proc/cpuinfo)
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for i in `seq 1 $cores`
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do
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column=`expr $i + 1`
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cut -f1,$column histogram >histogram$i
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done
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# Create plot command header
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echo -n -e "set title \"Latency plot\"\n\
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set terminal png\n\
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set xlabel \"Latency (us), max $max us\"\n\
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set logscale y\n\
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set xrange [0:400]\n\
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set yrange [0.8:*]\n\
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set ylabel \"Number of latency samples\"\n\
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set output \"plot.png\"\n\
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plot " >plotcmd
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# Append plot command data references
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for i in `seq 1 $cores`
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do
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if test $i != 1
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then
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echo -n ", " >>plotcmd
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fi
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cpuno=`expr $i - 1`
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if test $cpuno -lt 10
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then
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title=" CPU$cpuno"
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else
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title="CPU$cpuno"
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fi
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echo -n "\"histogram$i\" using 1:2 title \"$title\" with histeps" >>plotcmd
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done
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# Execute plot command
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gnuplot -persist <plotcmd
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# Print summary to /tmp
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echo "Generating latency summary to /tmp/latency-summary.log"
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grep -e "^#" output >/tmp/latency-summary.log
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# Copy plot to /tmp/latency-plot.png
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echo "Generating latency plot to /tmp/latency-plot.png"
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cp plot.png /tmp/latency-plot.png
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# Clean up
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rm -f histogram* output plotcmd plot.png
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