Sample — test — data for large WordPress install

I’m working on a plugin, Index WP MySQL for Speed. For testing it would be helpful to have a very large WordPress installation containing many thousands of posts, pages, metadata entries, media items, users, options, and so forth. The meaning of the data doesn’t matter — it can be lorem ipsum text — but having a lot of it would be great. For my purposes I don’t care whether the media files in wp-content/uploads are available. I just want to bring my test installation’s MySQL database server to its knees.

It would be great if it were a WooCommerce test site.

(I’m aware of the theme unit test data file at https://wpcom-themes.svn.automattic.com/demo/theme-unit-test-data.xml. But it’s not big enough for my specific purpose.)

Is there some such importable dataset available? Is there some sort of tool I can leave running for many hours to generate random data? If it comes to that, how would I create such an automated content production tool?

If I must generate my own load test dataset I’ll definitely GPL it.