The report highlights differences between the two runs, showing diff badges on accordion sections, diff flamegraphs, and side-by-side tables.
html-dir argument specifies the directory for the HTML report. If not specified, a temporary directory will be created. The file "index.html" is the start page.
The graph-spec-json-file argument points out a json file used for selecting which graphs to produce. If not specified, a default file will be used.
The -open-browser switch starts a web-browser directly on the generated file.
The -one-page switch puts all graphs on the same page instead of splitting into sub-pages.