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Atomic clocks are available via AWS #12

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Atomic clocks are available via AWS #12

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14 changes: 9 additions & 5 deletions README.markdown
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Expand Up @@ -242,14 +242,18 @@ Lamport, 1987:
- Globally distributed total orders on the scale of milliseconds
- Promote an asynchronous network to a semi-synchronous one
- Unlocks more efficient algorithms
- Only people with this right now are Google
- Spanner: globally distributed strongly consistent transactions
- And they're not sharing
- More expensive than you'd like
- Only people with this right now are:
- Google
- Spanner: globally distributed strongly consistent transactions
- And they're not sharing
- Amazon Web Services
- [Amazon Time Sync Service](https://aws.amazon.com/blogs/aws/keeping-time-with-amazon-time-sync-service/)
- NTP protocol should not be used. `chrony` is far superior at addressing clock skew with Amazon's time service that is kept in sync with atomic clocks.
- More expensive than you'd like, unless you can rely on a third party provider
- Several hundred per GPS receiver
- Atomic clocks for local corroboration: $$$$?
- Need multiple types of GPS: vendors can get it wrong
- I don't know who's doing it yet, but I'd bet datacenters in the
- I don't know who's doing it yet apart from AWS, but I'd bet datacenters in the
future will offer dedicated HW interfaces for bounded-accuracy time.


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