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#!/bin/bash
#
# Poor man's sampling profiler for NuttX.
#
# The stack folding script was inspired by stackcollapse-gdb.pl from the FlameGraph project.
#
# Usage: Install flamegraph.pl in your PATH, define the variables below, configure your .gdbinit, run the script and go
# have a coffee. When you're back, you'll see the flamegraph. Note that frequent calls to GDB significantly
# interfere with normal operation of the target, which means that you can't profile real-time tasks with it.
#
# Requirements: ARM GDB with Python support
#
root=$(dirname $0)/..
nsamples=100
sleeptime=0.01 # Doctors recommend 7-8 hours a day
taskname=uavcan
exe=$root/Build/px4fmu-v2_default.build/firmware.elf
set -e
stacksfile=/tmp/$taskname-stacks.log
cd $root
rm -f $stacksfile
echo "Sampling..."
for x in $(seq 1 $nsamples)
do
arm-none-eabi-gdb $exe --batch -ex "set print asm-demangle on" \
-ex "source $root/Debug/Nuttx.py" \
-ex "show mybt $taskname" \
2> /dev/null \
| sed -n 's/0\.0:\(#.*\)/\1/p' \
>> $stacksfile
echo -e '\n\n' >> $stacksfile
echo -ne "\r$x/$nsamples"
sleep $sleeptime
done
echo
echo "Stacks saved to $stacksfile"
cat $stacksfile | perl -e 'my $current = "";
my %stacks;
while(<>) {
if(m/^#[0-9]*\s*0x[a-zA-Z0-9]*\s*in (.*) at/) {
if ($1 ne "None") {
if ($current eq "") { $current = $1; }
else { $current = $1 . ";" . $current; }
}
} elsif(!($current eq "")) {
$stacks{$current} += 1;
$current = "";
}
}
foreach my $k (sort { $a cmp $b } keys %stacks) {
print "$k $stacks{$k}\n";
}' > /tmp/$taskname-folded.txt
echo "Folded stacks saved to /tmp/$taskname-folded.txt"
cat /tmp/$taskname-folded.txt | flamegraph.pl --fontsize=8 --width=1800 > /tmp/$taskname-flamegraph.svg
xdg-open /tmp/$taskname-flamegraph.svg
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