Hacker News: shayonj

New comment by shayonj in "Ask HN: Why were OpenAI, Claude, and Grok simultaneously down?"

shayonj — Thu, 03 Sep 2026 15:07:02 +0000

Interesting that this is happening around the same time as Claude issues too

New comment by shayonj in "PostgreSQL for Everything"

shayonj — Wed, 19 Aug 2026 15:07:13 +0000

Nice one re: flatbuffers in `blob` column. Have been working with flatbuffers a lot and that's a neat idea in general.

Not 100% sure about using PG for file system at scale however. I'd love to hear more on the challenges (vacuum, toast, anything else?)

New comment by shayonj in "Every fast write moves work somewhere else"

shayonj — Sun, 09 Aug 2026 17:48:09 +0000

v interesting. Thanks for sharing. I kept seeing this phenomenon of "no free lunches". TIL about the waterbed theory.

Every fast write moves work somewhere else

shayonj — Sun, 09 Aug 2026 15:36:52 +0000

Article URL: https://www.shayon.dev/post/2026/220/every-fast-write-moves-work-somewhere-else/

Comments URL: https://news.ycombinator.com/item?id=49232410

Points: 73

# Comments: 24

New comment by shayonj in "PostgreSQL's MVCC is bad. So is everyone else's"

shayonj — Wed, 29 Jul 2026 16:00:54 +0000

> Nothing was solved. The four questions got new answers, and the costs moved into the compactor.

I have been meaning to write on this topic and in relation to LSM for a while. So, I appreciated that note on LSMs. There are no free ~lunches~ reads or writes.

Building a Tiny FUSE Filesystem

shayonj — Sun, 14 Jun 2026 16:37:31 +0000

Article URL: https://www.shayon.dev/post/2026/161/building-a-tiny-fuse-filesystem/

Comments URL: https://news.ycombinator.com/item?id=48529287

Points: 2

# Comments: 0

Exploring building a tiny FUSE filesystem

shayonj — Fri, 12 Jun 2026 16:38:10 +0000

Article URL: https://www.shayon.dev/post/2026/161/building-a-tiny-fuse-filesystem/

Comments URL: https://news.ycombinator.com/item?id=48506286

Points: 79

# Comments: 15

Building a Tiny FUSE Filesystem

shayonj — Thu, 11 Jun 2026 18:04:07 +0000

Article URL: https://www.shayon.dev/post/2026/161/building-a-tiny-fuse-filesystem/

Comments URL: https://news.ycombinator.com/item?id=48494100

Points: 2

# Comments: 0

I am not leaving GitHub any time soon

shayonj — Wed, 29 Apr 2026 15:16:46 +0000

Article URL: https://www.shayon.dev/post/2026/118/i-am-not-leaving-github-any-time-soon/

Comments URL: https://news.ycombinator.com/item?id=47949624

Points: 2

# Comments: 0

GitHub Down Again

shayonj — Mon, 27 Apr 2026 17:03:18 +0000

Article URL: https://www.githubstatus.com/incidents/ql942tw29yl6

Comments URL: https://news.ycombinator.com/item?id=47924260

Points: 14

# Comments: 2

Shipping Fast Requires a High Degree of Trust

shayonj — Sun, 12 Apr 2026 15:58:11 +0000

Article URL: https://www.shayon.dev/post/2024/7/shipping-fast-requires-a-high-degree-of-trust/

Comments URL: https://news.ycombinator.com/item?id=47741232

Points: 1

# Comments: 1

Fast sandboxed code execution with pre-warmed gVisor pools

shayonj — Tue, 31 Mar 2026 16:31:49 +0000

Article URL: https://github.com/shayonj/gvisord

Comments URL: https://news.ycombinator.com/item?id=47589885

Points: 2

# Comments: 0

Fast sandboxed code execution with pre-warmed gVisor pools

shayonj — Mon, 30 Mar 2026 12:53:12 +0000

Article URL: https://github.com/shayonj/gvisord

Comments URL: https://news.ycombinator.com/item?id=47573658

Points: 2

# Comments: 0

New comment by shayonj in "Linux Page Faults, MMAP, and userfaultfd for faster VM boots"

shayonj — Fri, 20 Mar 2026 11:29:14 +0000

that's very interesting! I was noticing page vault storm on live migrations as well and I wonder if that's what you were running into / mentioning here regarding the lock contention

New comment by shayonj in "Show HN: Sub-millisecond VM sandboxes using CoW memory forking"

shayonj — Wed, 18 Mar 2026 13:34:16 +0000

> you can do things that aren't practical with 100-200ms startup: speculative parallel execution (fork 10 VMs, try 10 approaches, keep the best), treating code execution like a function call instead of an infrastructure decision, etc.

i am not following, why isn't it practical?

New comment by shayonj in "Show HN: Sub-millisecond VM sandboxes using CoW memory forking"

shayonj — Wed, 18 Mar 2026 13:00:40 +0000

Cool project. +1 on userfaultfd for the multi-node path. Wrote about how uffd-based on-demand restore works wrt to my Cloud Hypervisor change [1] if you are curious.

I think the the main things to watch are fault storms at resume (all vCPUs hitting missing pages at once) and handler throughput if you're serving pages over the network instead of local mmap. I think its less likely to happen when you fork a brand new VM vs say a VM that has been doing things for 5 mins.

Also interestingly, Cloud Hypervisor couldn't use MAP_PRIVATE for this because it breaks VFIO/vhost-user bindings. Firecracker's simpler device model is nice for cases like this.

[1] https://www.shayon.dev/post/2026/65/linux-page-faults-mmap-a...