Hacker News: dapperdrake

New comment by dapperdrake in "Steel Bank Common Lisp version 2.6.7"

dapperdrake — Tue, 28 Jul 2026 21:12:04 +0000

#|))))

New comment by dapperdrake in "Nobody knows what a used GPU cluster is worth"

dapperdrake — Thu, 23 Jul 2026 11:07:07 +0000

Then where are the HDMI ports on Nvidia's current data center GPU product lines?

New comment by dapperdrake in "Nobody knows what a used GPU cluster is worth"

dapperdrake — Thu, 23 Jul 2026 11:05:42 +0000

And the change in failure rate and technical advances are a de-facto change in actual depreciation vs. accounting depreciation.

New comment by dapperdrake in "Nobody knows what a used GPU cluster is worth"

dapperdrake — Thu, 23 Jul 2026 11:04:04 +0000

Electricity gets converted to heat which has to be removed through the cooling system.

Performance per Watt is the key metric for data centers full of GPUs.

New comment by dapperdrake in "Frame – Linux X server in Assembly"

dapperdrake — Fri, 17 Jul 2026 19:09:32 +0000

Kernel option nohz_full in grub config.

Also disable hardware SMT as a kernel option in grub config. Then the cores can clock down way more often and L1 data cache size doubles.

XFCE and X11 tripled my laptop battery life vs. whatever Wayland+GNOME Ubuntu (2024?) brought by itself.

Powertop and tlp also help.

Happy camping.

EDIT: the lower heat dissipation also halved boot time. That one surpised me the most.

EDIT2: Disable "atime" with ext4 option "noatime". Saves a lot of power, heat, trimming, and re-writes on your SSD/NVMe.

For "faster shutdowns" manually run systemctl start fstrim.service. Not exactly sure why fstrim.timer seems unreliable.

New comment by dapperdrake in "Postgres rewritten in Rust, now passing 100% of the Postgres regression tests"

dapperdrake — Fri, 10 Jul 2026 10:26:22 +0000

The joke is awesome.

Sadly, monospaced fonts kill sarcasm.

New comment by dapperdrake in "Postgres rewritten in Rust, now passing 100% of the Postgres regression tests"

dapperdrake — Thu, 09 Jul 2026 13:36:06 +0000

"Everybody has a production system. The lucky ones also have a test system."

New comment by dapperdrake in "Why developers are ditching GitHub for Codeberg and self-hosting alternatives"

dapperdrake — Thu, 09 Jul 2026 13:33:29 +0000

Wow. GitHub gaining the same reputation as DNS ("it's always DNS"), printers, OSI layer 8, and PEBKAC is actually a bit of an achievement.

Hat tip to Microsoft.

New comment by dapperdrake in "How to Build a Minimal ZFS NAS Without Synology, QNAP, TrueNAS (2024)"

dapperdrake — Wed, 08 Jul 2026 08:08:22 +0000

zpool-replace(8)

https://openzfs.github.io/openzfs-docs/man/master/8/zpool-re...

ZFS got this right. MDADM on ext4 somehow did not.

EDIT: ext4 on MDADM.

How ZFS gets this right: zfs(8) on zpool(8). So, basically, ext4 and mdadm can talk to each other.

New comment by dapperdrake in "How to Build a Minimal ZFS NAS Without Synology, QNAP, TrueNAS (2024)"

dapperdrake — Wed, 08 Jul 2026 08:04:19 +0000

ATA (SATA), SCSI (SAS), and NVM (NVMe).

New comment by dapperdrake in "Why you should not have Managers in your class name"

dapperdrake — Tue, 07 Jul 2026 08:54:56 +0000

Underrated

New comment by dapperdrake in "Pandoc Lua Filters"

dapperdrake — Sun, 05 Jul 2026 17:30:59 +0000

Look at flag --standalone. At least for html output pandoc seems to be able to handle something that feels like partial pandoc input in practice and produce html output that behaves like a snippet.

Pandoc AST - format called "native" - parses faster than pandoc markdown.

New comment by dapperdrake in "Matrix Orthogonalization Improves Memory in Recurrent Models"

dapperdrake — Wed, 01 Jul 2026 16:47:39 +0000

I saw a presentation about this in 2022.

Someone found a way to get "something like" a tri-diagonal matrix that was equivalent to the LLM they were studying in 2022.

Apologies for being informal and hand-wavey. Been a long time and I probably forgot a few important points.

New comment by dapperdrake in "Matrix Orthogonalization Improves Memory in Recurrent Models"

dapperdrake — Wed, 01 Jul 2026 06:52:39 +0000

Not even cross-domain. (Nor cross-co-domain.)

Trigonometric polynomials are also polynomials. And linear spaces are all "the same". That is what the definition is for. Even the transpose-mapping is linear.

New comment by dapperdrake in "Fintech Engineering Handbook"

dapperdrake — Sat, 27 Jun 2026 11:33:41 +0000

First half didn’t sound so bad.

New comment by dapperdrake in "Giant Banana Pulled Over: Driver Says Cops Have Stopped Him 100s of Times"

dapperdrake — Tue, 23 Jun 2026 13:38:29 +0000

Most of the whimsy vitamins are between the skin and the banana.

New comment by dapperdrake in "Google Hits 50% IPv6"

dapperdrake — Sun, 21 Jun 2026 11:56:50 +0000

And the Internet routes around a problem, yet again.

Good example of the 2020s on why there is practically truly only one Internet instead of many.

New comment by dapperdrake in "Unity vs. Floating Point"

dapperdrake — Sun, 21 Jun 2026 11:55:41 +0000

Do intermediate values always turn into double floats?

New comment by dapperdrake in "When I reject AI code even if it works"

dapperdrake — Sun, 21 Jun 2026 06:28:29 +0000

Maybe that feedback loop finally got fast enough to die out.

New comment by dapperdrake in "Ask HN: How to get ideas for space startups?"

dapperdrake — Sun, 21 Jun 2026 04:57:53 +0000

Am also interested in this. Manufacturing for the win.