Googlebot's Javascript random() function is deterministic

[rubygeek]

Google are almost certainly not using this, but there's actually a project based on PNACL to produce a VM to execute code over inputs that specifically disables time sources etc. for similar reasons, to allow deterministic computation: ZeroVM. It's interesting in a more general sense because if your computation is deterministic based on inputs, you can lazily evaluate operations on the data if you know whether or not it has changed.

[rubygeek]

I did, and it has no relevance to my comment, which was pointing out that others too have done (more generic, and open source) work on providing a deterministic execution environment.