@dapsays

Software engineer also at @dap@hachyderm.io

davepacheco.net/blog/
Joined February 2011
  • Tweets2.8K
  • Following208
  • Followers1.4K
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Surprising absolutely no one, @ahl and I are going to pick this up on the next Oxide and Friends, where we'll be joined by @dapsays to discuss our history and disposition with respect to CockroachDB. Join us: Monday, 5p Pacific! discord.gg/QrcKGTTPrF?event=…

Join the Oxide Computer Company & Friends Discord Server!

The Oxide Computer Company and friends; home of the Oxide and Friends podcast. | 5063 members

discord.com
Bryan Cantrill
@bcantrill16 Aug 2024
RFD 508: Whither CockroachDB? rfd.shared.oxide.computer/rf…

508 - Whither CockroachDB? | RFD | Oxide

rfd.shared.oxide.computer
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RFD 508: Whither CockroachDB? rfd.shared.oxide.computer/rf…

508 - Whither CockroachDB? | RFD | Oxide

rfd.shared.oxide.computer
Paul Querna
@pquerna16 Aug 2024
1st coffee: i see @bcantrill commits to forking cockroach db: news.ycombinator.com/item?id… hoping there will be an @adamhjk thread about cockroach license change before 2nd coffee time.
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In building Omicron, the control plane at Oxide, we took inspiration from @caitie's resurrection of sagas, a 1980s-era database idea. On Monday, @ahl and I will be joined by @mycoliza and @dapsays to talk about our saga with sagas. Join us, 5p Pacific! discord.gg/QrcKGTTPrF?event=…

Join the Oxide Computer Company & Friends Discord Server!

The Oxide Computer Company and friends; home of the Oxide and Friends podcast. | 5051 members

discord.com
third-party evaluation partner@mycoliza9 Aug 2024
i've spent the last four months or so working on rewriting the parts of the @oxidecomputer control plane responsible for managing the lifecycle of VM instances on the rack, and i have to say, seeing this branch finally merge today feels *really* good: github.com/oxidecomputer/omi…

Perform instance state transitions in `instance-update` saga by hawkw · Pull Request #5749 ·...

A number of bugs relating to guest instance lifecycle management have been observed. These include: Instances getting "stuck" in a transient state, such as Starting or Stopping, ...

github.com
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i've spent the last four months or so working on rewriting the parts of the @oxidecomputer control plane responsible for managing the lifecycle of VM instances on the rack, and i have to say, seeing this branch finally merge today feels *really* good: github.com/oxidecomputer/omi…

Perform instance state transitions in `instance-update` saga by hawkw · Pull Request #5749 ·...

A number of bugs relating to guest instance lifecycle management have been observed. These include: Instances getting "stuck" in a transient state, such as Starting or Stopping, ...

github.com
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When we built the Oxide Cloud Computer, we wanted to rectify (no pun intended!) a major issue with traditional servers: power supply + efficiency. Legacy infrastructure is wildly inefficient - each traditional server is individually plugged into power supplies converting AC to
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Dave Pacheco retweeted
Adam Leventhal@ahl29 Dec 2023
You can add DTrace USDT probes to your Rust programs. Didn't know? Well neither did a bunch of our Oxide colleagues so we made some slides. ahl.dtrace.org/2023/12/29/dt…

DTrace probes in Rust

DTrace’s User-land Statically-Defined Tracing (USDT) was… kind of an accident. Bryan has (kindly) retconned the genesis of USDT as a way to understand dynamic…

ahl.dtrace.org
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Dave Pacheco retweeted
Adam Leventhal@ahl5 Dec 2023
We’ve been working on this whole ecosystem of OpenAPI related Rust facilities—server framework, linter, client codegen, CLI codegen, test framework, etc. It’s got all the fussiness and brevity that I love about Rust. I’m looking forward to talking about it in Austin!
Nordic APIs@nordicapis4 Dec 2023
🎊 We're super excited to announce the first lot of speakers for Austin API Summit 2024. Check them out and join us in March. Shout out to @savram8 @lifewingmate @InsiderPhD @launchany @ahl @d3dvincent @_RamB_ @KenCenerelli @travisspencer nordicapis.com/events/austin…

Austin API Summit 2024 | Nordic APIs

Austin API Summit - a leading API conference, where industry experts and thought leaders meet to share the latest thinking and technologies. Register Now!

nordicapis.com
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If you're attending @QConSF next week and are interested in the challenges of networking in a rack-scale computer, you will want to be sure to check out the talk by Oxide engineer @rgoodfel!
Ryan Goodfellow's talk on Building a Rack-Scale Computer with P4 Core at QConSF

ALT Ryan Goodfellow's talk on Building a Rack-Scale Computer with P4 Core at QConSF

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Dave Pacheco retweeted
P4@P4lang14 Aug 2023
Learn about an independently developed open source P4 compiler built by a team at @oxidecomputer. Check out the blog, video and slides for all the details. | bit.ly/3KAeDr6 #P4 #OpenSource
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How it started.. how it's going..
Isometric concept drawing of a rack scale computer, showing a compute server, a networking switch, backplane and uplink cabling.

ALT Isometric concept drawing of a rack scale computer, showing a compute server, a networking switch, backplane and uplink cabling.

An Oxide Model 0 rack scale computer placed in a cage in a public data center.

ALT An Oxide Model 0 rack scale computer placed in a cage in a public data center.

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Replying to @SFGate
@SFGate this article reports that an earthquake happened today at 4:34pm local time (i.e., the future). From the linked USGS page it looks like it was 1634 UTC, which is 8:34am local time.
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Oops, the link: sfgate.com/news/article/Magn…

Magnitude 3.1 earthquake rattles East Bay

The United States Geological Survey reports a preliminary magnitude 2.9 earthquake struck...

sfgate.com
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Wow, great to see this. We spent much of 2017 debugging and working around this problem at Joyent cc @bcantrill
Planet PostgreSQL@planetpostgres10 Nov 2022
Thomas Munro (@MengTangmu): Reducing replication lag with IO concurrency in Postgres 15 postgr.es/p/5s1
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The amusing part was asking at PgConf SF about this problem (which we hadn’t found documented anywhere) and being referred to the work we had done on pg_prefaulter
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Dave Pacheco retweeted
Adam Leventhal@ahl12 Oct 2022
On the back of the enthusiastic response to @bcantrill's talk at OSFC "I have come to bury the BIOS, not to open it - The need for holistic systems", our space Monday was devoted to holistic boot and the approach we've taken at @oxidecomputer youtube.com/watch?v=KItJzncv…
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If you are wondering about our approach to platform initialization, see this excellent explanation from @dave_universetf 👇🧵
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a debugging manifesto
a debugging manifesto 1. inspect, don't squash try to fix the bug (crossed out) understand what happened (yes, smiley faces and stars) 2. check your assumptions person (thinking): "wait, how do I know that's true?" 3. being stuck is temporary person (thinking): "I will never figure this out!" ... 2 minutes later.... person (thinking): "well, I haven't tried X..." 4. don't go it alone person (speaking to other person): "hey, have you seen this problem before?" 5. trust nobody and nothing person (thinking): this library can't be buggy... OR CAN IT??? 6. there's always a reason computer: "computers are always logical, even when it doesn't feel that way" 7. build your toolkit person (holding toolkit): "wow, the CSS inspector makes debugging SO MUCH EASIER" 8. it can be an adventure person (talking, with cute bug next to them): "you wouldn't BELIEVE the weird bug I found" by @b0rk @omarieclaire, more like this at https://wizardzines.com

ALT a debugging manifesto 1. inspect, don't squash try to fix the bug (crossed out) understand what happened (yes, smiley faces and stars) 2. check your assumptions person (thinking): "wait, how do I know that's true?" 3. being stuck is temporary person (thinking): "I will never figure this out!" ... 2 minutes later.... person (thinking): "well, I haven't tried X..." 4. don't go it alone person (speaking to other person): "hey, have you seen this problem before?" 5. trust nobody and nothing person (thinking): this library can't be buggy... OR CAN IT??? 6. there's always a reason computer: "computers are always logical, even when it doesn't feel that way" 7. build your toolkit person (holding toolkit): "wow, the CSS inspector makes debugging SO MUCH EASIER" 8. it can be an adventure person (talking, with cute bug next to them): "you wouldn't BELIEVE the weird bug I found" by @b0rk @omarieclaire, more like this at https://wizardzines.com

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Dave Pacheco retweeted
Kate Hicks@mrskatehicks9 Sep 2022
Tales of startup supply chain up on the @oxidecomputer blog, or as Kirstin would put it, when allocation hits the fan. oxide.computer/blog/navigati…

Navigating Today’s Supply Chain Challenges | Oxide Computer Company

The tale of a small tech startup navigating procurement in the most constrained market in recent history.

oxide.computer
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We are shipping our first racks by the end of the year, and we are very excited to get our new website up -- including many more details about what we've done and why. Awesome work, @lenjaminbeonard and crew! oxide.computer

Oxide Computer Company

The cloud you own. Hardware, with the software baked in, for running infrastructure at scale.

oxide.computer
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Dave Pacheco retweeted
Bryan Cantrill
@bcantrill4 May 2022
Horrifyingly, it apparently needs to be said: many abortions are -- in fact -- wanted pregnancies. To compound a mother's grief by outlawing the medical procedure that she needs to assure her own health is unconscionable and inhumane.
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Database corruption is rarely reliably reproducible, which makes this tale from @dapsays on debugging corruption in CockroachDB that much more riveting: github.com/oxidecomputer/omi…

apparent cockroachdb data corruption due to cockroachdb issue 74475 · Issue #980 · oxidecomputer/...

tl;dr: CockroachDB v21.1.10 has a bug where queries can return "incorrect results" due to index corruption "when two or more partial indexes in the same table had identical WHERE cla...

github.com
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