README.md

Flame Graphs

Notes on producing Flame Graphs for Bitcoin Core.

This is based off some work originally done by Evan Klitzke.

Colouring

This directory includes a patch that will colour the graphs such that:

• Yellow - Bitcoin Core
• Blue - Boost
• Green - LevelDB
• Orange - System
• Red - Everything else

Generating

# clone the Flame Graph repo
git clone https://github.com/brendangregg/FlameGraph && cd FlameGraph

# apply the bitcoin colouring patch
patch -p1 < path/to/core-review/flamegraph/bitcoin-colour.patch

# run bitcoind
./bitcoind

# capture 180s worth of data
sample bitcoind 180 -wait -f sample.output

cat sample.output | ./stackcollapse-sample.awk | ./flamegraph.pl --color bitcoin > sample.svg

firefox --new-window "file://$(realpath sample.svg)"

You can also filter the stack output before creating the graph:

cat sample.output | ./stackcollapse-sample.awk | \
grep -i 'ProcessMessage' | \
./flamegraph.pl --color bitcoin > sample.svg

You should end up with graphs that look similar too this: