Colm MacCarthaigh's Avatar

Colm MacCarthaigh

@colmmacc.bsky.social

VP / Distinguished Engineer at Amazon Web Services. Also: Open Source and Apache, Cryptography, Irish Music, mediocre Photography.

1,858 Followers  |  345 Following  |  178 Posts  |  Joined: 26.04.2023
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Posts by Colm MacCarthaigh (@colmmacc.bsky.social)

Just some frequentists waiting on a few more samples.

09.02.2026 04:30 — 👍 1    🔁 0    💬 0    📌 0

Who would ever name a stout that? what? I can't even ... wait, is it because it's loaded full of Iron?

09.02.2026 04:01 — 👍 1    🔁 0    💬 1    📌 0

Costco was packed today during Super Bowl - busier than previous years, even when Seattle played. Our traditional hack is losing its clout.

09.02.2026 01:46 — 👍 4    🔁 0    💬 0    📌 0

It used to cost half a penny to cross the Liffey, but a quarter of panti could get you a whole new perspective on life.

06.02.2026 18:35 — 👍 1    🔁 0    💬 0    📌 0

This ... x.com/timbray/stat...

05.02.2026 19:20 — 👍 0    🔁 0    💬 0    📌 0

Well worth a subscribe.

30.01.2026 20:48 — 👍 3    🔁 0    💬 0    📌 0
Testing CMAT's Music Knowledge | Track Star*
YouTube video by Track Star* Testing CMAT's Music Knowledge | Track Star*

Seeing @cmatbaby.bsky.social on TrackStar is the venn diagram we all need. www.youtube.com/watch?v=g7tp...

09.01.2026 17:44 — 👍 1    🔁 0    💬 0    📌 0

We must be the same age from very similar locations, but we'd call them the 'ra, and John Kelly playing the Marino Waltz on every ad break would try to make you feel better about the dire smog.

09.01.2026 13:51 — 👍 1    🔁 0    💬 1    📌 0

Isn't that spelled "impunity"?

08.01.2026 19:54 — 👍 1    🔁 0    💬 0    📌 0
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Saltwater ice here in Maine.

03.01.2026 17:14 — 👍 7    🔁 0    💬 1    📌 0

A long time ago I disabled RC4 in Amazon's cryptography. A few days later I was woken up by a page from a testing team. Switching to AES had caused a battery runtime regression on some generations of Kindles. Like .. a few minutes less per charge. We found a fix, but no good deed goes unpunished!

17.12.2025 01:06 — 👍 14    🔁 0    💬 0    📌 0

I knew that Lopez had written an unreleased book for "Kermit, Prince of Denmark", a hamlet parody, but this goes far harder than I'd expected. That is a legit top tier broadway song. It'd be an instant classic. How many of these are just squirreled away?

15.12.2025 22:53 — 👍 2    🔁 0    💬 0    📌 0

CS programs should: (A) Use O(C) as notation instead of O(1)— 'constant' is clearer than '1'. Yes the entire field should change convention. It matters. (B) Teach Control Theory as a foundational subject.

15.12.2025 17:45 — 👍 9    🔁 0    💬 1    📌 0
0xF - "Atoms of Emergence"
YouTube video by Shuffle Sharding 0xF - "Atoms of Emergence"

Here's the recorded Twitch repeat of "Atoms of Emergence" where we dig into counter-intuitive emergent behaviors that drive metastable failures. A fine-grained deep-dive that shows how small changes can make a big difference in preventing long outages, plus my favorite graph ever! Feedback welcome.

12.12.2025 21:13 — 👍 12    🔁 1    💬 0    📌 0

Live now and starting in 5 minutes at twitch.tv/colmmacc

12.12.2025 17:57 — 👍 2    🔁 0    💬 0    📌 0

It's been years, but I'm bringing back my Twitch channel to repeat a session that many attendees said was their favorite of re:Invent. We'll do an interactive deep dive into emergent behavior, metastable failures, and how to prevent long outages.
This Friday, 10AM Pacific time. twitch.tv/colmmacc

10.12.2025 20:46 — 👍 5    🔁 0    💬 0    📌 1

The "Star Trek: Kahn" radio play podcast is A+. The music is better than the series, the story arc and characters are much more complex. Creative sound editing too. Wrenn Schmidt and Naveen Andrews both perfectly cast. I hope the world makes more culture like this.

30.11.2025 21:59 — 👍 3    🔁 0    💬 0    📌 0

My guess is that if anything, the NSA have evidence that ECC is more breakable than is publicly known, so why waste cycles on it. But the late 90s era crypto export key size restrictions were not a NOBUS in practice, so there is some form there. Hybrid still seems prudent to me though.

24.11.2025 21:49 — 👍 8    🔁 0    💬 1    📌 0

Yes, emergent needs to revert.

24.11.2025 18:14 — 👍 2    🔁 0    💬 0    📌 0
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A few of the reference slides from the "Atoms of Emergence" 500-level chalk talk I'm doing at re:Invent. Really looking forward to really digging into some of the surprising emergent behaviors in request response systems, metastability, and more!

21.11.2025 21:01 — 👍 6    🔁 0    💬 0    📌 2

Ancient spells cast still
Ignore prior instructions
The old ways persist

20.11.2025 20:18 — 👍 2    🔁 0    💬 0    📌 0

@pluribuspod.bsky.social Love listening to your episodes. I think Carol is literally intended to be the most miserable person in the world ... left in the world that is. She's definitely more miserable than the pluribus, and the other 5 uninfected we've met.

11.11.2025 00:49 — 👍 3    🔁 0    💬 1    📌 0

When she was done, people were stunned, and clapped in awe as much as praise. She quietly went back to her group of friends and that was that. People approached her in gratitude throughout the night. To even have one moment like that is to live. What a gift. 6/6

09.10.2025 11:28 — 👍 6    🔁 0    💬 0    📌 0

It was the perfect pace too; plenty of room for ornaments and emphasis. It's so much harder to sing like that. As a band we held back and left her that space. Easily one of the top vocal performances I have seen in person. 5/n

09.10.2025 11:28 — 👍 0    🔁 0    💬 1    📌 0

To this day I don't know who she was or what language she sang it in. She kept the words "Fields of Gold". Every other word was completely unfamiliar to me. She captivated the whole room. Her singing was incredible. Her phrasing and momentum so unique and intentional. 4/n

09.10.2025 11:28 — 👍 0    🔁 0    💬 1    📌 0

We'd played it before for singers; most often in the style of Eva Cassidy's cover. Often overdone. But this lady's English wasn't great and she was shy to even talk to the band. She hummed a note to indicate the key, and counted in to set a pace like a pro. 3/n

09.10.2025 11:28 — 👍 0    🔁 0    💬 1    📌 0

Twenty years ago I was the guitarist in a live karaoke band. That's just what it sounds like; random people sing what they want and we'd accompany them live. One night a quiet lady came up and asked to do "Fields of Gold". 2/n

09.10.2025 11:28 — 👍 0    🔁 0    💬 1    📌 0

Yesterday Sting's "Fields of Gold" played on an airplane as we boarded and it brought back such a great memory for me. 1/n

09.10.2025 11:28 — 👍 2    🔁 0    💬 1    📌 0

Nobody gets their kicks on "rowt" 66.

02.10.2025 21:23 — 👍 0    🔁 0    💬 0    📌 0

"Full throttle" means maximum speed .... but also minimum speed. Make it make sense.

26.09.2025 06:10 — 👍 2    🔁 0    💬 1    📌 0