Time-Appliance-Project
fboss
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| Time-Appliance-Project | fboss | |
|---|---|---|
| 13 | 1 | |
| 1,291 | 851 | |
| 1.9% | 1.2% | |
| 9.2 | 9.9 | |
| 6 days ago | about 23 hours ago | |
| C | C++ | |
| MIT License | GNU General Public License v3.0 or later |
Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
Time-Appliance-Project
- Time Card Mini Adds Pi, GPS, and OXCO to Your PC
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Meta's Reality Labs lost $3.99 billion last year, bringing its total losses since 2020 to $30 billion
Even just specific projects under that have been impactful. For example the open time server project.
- What’s the most granular magnitude of time (Picosecond, Femtosecond, etc.) that a CPU can return when it’s queried for system time?
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New atomic clock loses only one second every 300B years
Facebooks Time Card is a good starting point if you want to start looking into how higher end timing devices are built: https://github.com/opencomputeproject/Time-Appliance-Project...
Afaik its not currently available for purchase, so it is more of a diy route. If you want a standalone unit, it probably wouldn't be too big of hassle to ducktape that Time Card to e.g. Raspberry Pi CM4 or similar module with pcie and drive a display (or whatev) that way. Or that FPGA on the Time Card probably has enough spare capacity to do it directly too, for a simplified architecture (and maybe better hard realtime control).
- Time Appliance Project
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Host your own Stratum 1 NTP (network time protocol) server using a $12 USD USB GPS to keep all your other servers synchronized
Now you can get/build your own atomic pcie clock for ~$300-2000 for your rack!
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Time Card
Time Card is an open-source solution for PTP-enabled networks that provides the accurate time via GNSS—with a high stability (and holdover) oscillator such as an atomic clock as a backup in the event of GNSS failure. zeroibis recommends it for those who "need to go the full self-hosted NTP route."
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NTP - Help!
On a related note if you need to go the full self hosted NTP route: https://github.com/opencomputeproject/Time-Appliance-Project/tree/master/Time-Card
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Facebook open-sourcing a more precise time server
Really nice of them to release this. However, unless I'm missing something, the HDL for the FPGA on the Time Card is not part of the release. It looks like it uses a proprietary IP core from NetTimeLogic
https://github.com/opencomputeproject/Time-Appliance-Project...
They do include FPGA bit streams, but it's disingenuous to claim a fully open source release.
fboss
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Facebook open-sourcing a more precise time server
It looks like the source for their FBOSS agent that runs on switches will enable PTP in two kinds of supported switches:
https://github.com/facebook/fboss/blob/master/fboss/agent/hw...
They have O(thousands) of switches (source: https://engineering.fb.com/2016/10/18/data-center-engineerin...) so IIRC they get the per-switch cost down by doing a custom design to reduce BOM. I believe the specs and designs are available under the Open Compute project here (search for "Facebook"): https://www.opencompute.org/wiki/Networking/SpecsAndDesigns
What are some alternatives?
GNSSTimeServer - WiFi-enabled GNSS (GPS, BeiDou, GLONASS, Galileo) fed NTP/RDATE server based on ESP8266/ESP32 and Arduino
beaglebone-gps-clock
Flicks - A unit of time defined in C++.
onload - OpenOnload high performance user-level network stack
magma - Platform for building access networks and modular network services
jepsen.tarantool - Jepsen tests for Tarantool