I applied to the GCC compiler farm late last year, but received a reply only after so long a time that I'd deleted the key pair I'd submitted because I thought nothing was going to happen - and my efforts to get back in have yet been unanswered.

The GCC compile farm isn't for intensive testing or benchmarking, though (which is what you need for lock-free, to try to catch race conditions) - that test lab sounds more interesting.

I have to say though having your own dev boards which are yours and only yours and which you can hammer endlessly is very convenient. It's actually just occurred to me I can leave all the devs boards permanently running the test suite...

OTOH, I don't think I can get small, portable dev boards for all the platforms I care about, so at least for some architectures, a third-party farm is probably the only way.

Probably the most pressing requirement though is access to a Mac. Right now there are no build files for that platform.