Giraffe

Copyright (C) 2019-2021 The Open Library Foundation. This software is distributed under the terms of the Apache License, Version 2.0. See the file LICENSE for more information.

Overview

Giraffe is a tool for creating visualizations of Okapi logs such as call graphs.

System requirements

• Linux, macOS, possibly Windows
• Go 1.16 or later
• Graphviz

Giraffe has not been tested in Windows, but it may work normally or using the "Two Step" method below.

Installing Giraffe

First set the GOPATH environment variable to specify a path that can serve as the build workspace for Go, e.g.:

export GOPATH=$HOME/go

Then:

go build ./cmd/giraffe

This builds the giraffe executable in the current directory.

Running Giraffe

To generate a call graph in PDF format from part of an Okapi log stored in sample.log:

giraffe call -i sample.log -o sample.pdf

Other output formats, PNG, JPEG and DOT, are supported via the -T flag, for example:

giraffe call -i sample.log -o sample.png -T png

Giraffe can highlight response times that meet a specified threshold, given in milliseconds. For example, to highlight response times of at least 250 ms:

giraffe call -i sample.log -o sample.pdf -rstime 250

For more information about command line flags:

giraffe help

Running Giraffe in Two Steps

If the instructions above do not work, for instance in Windows, try running Giraffe in two steps using dot:

giraffe call -i sample.log -o sample.dot -T dot

dot -o sample.pdf -T pdf sample.dot