j_not_j

7 ms·

1.
by j_not_j 4mo ago
I was part of a group touring HP labs in the mid-1970s. They showed us how they computed the key dimensions and typography with an (HP) minicomputer, then had it print out the commands for some kind of numerically controlled cutting machine
2.
by j_not_j 8mo ago
Went for a walk today. Found a $100 bill in the grass. No-one nearby to think it might belong to them.
3.
by j_not_j 1y ago
Alpha had a lot of implementation problems, e.g. floating point exceptions with untraceable execution paths. Cray tried to build the T3E (iirc) out of Alphas. DEC bragged how good Alpha was for parallel computing, big memory etc etc. But C
4.
by j_not_j 1y ago
Ascending is all you need.
5.
by j_not_j 1y ago
"wet coast" Slang for BC. It's a joke, because (coastal) BC is mostly wet. And BC is the westernmost province.
6.
by j_not_j 1y ago
"brown toast". When ordering breakfast, such as eggs and toast. "You want white or brown toast?" Since most toast is toasted to a brown tone, the question confuses Americans (west-coast, anyways). It's really the q
7.
by j_not_j 1y ago
"off-sale" at a licensed premises means sale for off-premise consumption. In BC.
8.
by j_not_j 1y ago
Wouldn't be worth the trouble to try. Why, you ask? How do you point it? Where do you point it? You have a "telescope" with a field of view of one-planets worth of pixels. But the planet is in orbit, so it drifts away from
9.
by j_not_j 1y ago
Beebe publishes a lengthy bibliography. https://www.netlib.org/tex/bib/prng.pdf 758 pages and counting....
10.
by j_not_j 1y ago
Downey published a (big-endian, SPARC) method in 2007: https://allendowney.com/research/rand/ And Lemire in 2017 asked the question https://lemire.me/blog/2017/02/28/how-many-fl
11.
by j_not_j 1y ago
Some comments, in random order: - your test codes are not reproducible: running twice generates different sets of numbers because they have unknown seeds. As a result, if you change (a) compilers or compiler switches, (b) operating system
12.
by j_not_j 2y ago
yes
13.
by j_not_j 2y ago
See https://www.nextplatform.com/2023/05/01/just-how-big-are-nvi... They estimated $200k for a single NVIDIA GPU-based CPU complete with RAM and networking. That's where my number came from. (RAM and e
14.
by j_not_j 2y ago
I don't for a minute believe Deepseek v3 was built with a $6M rental. Their paper (arxiv 2412:1947) explains they used 2048 H800s. A computer cluster based on 2048 GPUs would have cost around $400M about two years ago when they built
15.
by j_not_j 2y ago
Offtopic: OpenBSD has an installation ramdisk. Just boot that. See https://raby.sh/installing-openbsd-on-ovhs-vps-2016-kvm-mach... I've also seen "dd if=path/to/install/ramdisk /dev/sd0&q
16.
by j_not_j 2y ago
Risk is about probabilities and hazards. This article is about absolutes and fear. To conflate the two is an obvious rhetorical trick that amounts to clickbait, approximately. "It's rare for a reentering object to hit a structure
17.
by j_not_j 2y ago
There is a real art to doing "benchmarks", more correctly called "synthetic benchmarks" since they don't reflect actual usage but are intended for comparisons. I had tried pgvector 0.6.2 on an OCI free node (2cpu 64
18.
by j_not_j 2y ago
And he didn't repeat each test case 5 or 9 times, and take the median (or even an average). There will be operating system noise that can be in the multi-percent range. This is defined as various OS services that run "in the back
19.
by j_not_j 2y ago
OpenBSD source gets independent code reviews, and they run syzcaller continuously. https://marc.info/?l=openbsd-tech&w=2&r=1&s=coverity&q=b https://marc.info/?l=openbsd-tech&m=16430349802
20.
by j_not_j 3y ago
There is a recent update to the blis alternative to BLAS that includes a number of RISC-V performance optimizations. https://github.com/flame/blis/pull/737
21.
by j_not_j 3y ago
There are three more I have to use: 4x4 matrix: you are challenged with letter/number for row/column and must respond with the matrix entry. Not much better than totp; try to find it on your phone. photo array: given an array of
22.
by j_not_j 3y ago
See also The Art of Computer Systems Performance Analysis by Jain. The statistical parts are very good: self contained and with good explanations. Perhaps a weakness is there isn't much on distributed systems. He did some Youtube video
23.
by j_not_j 3y ago
Tubes. And diodes (see the BOM).
24.
Guyana Seeks UN Court Protection on 'Sinister' Venezuela Territorial Claim(barrons.com)
2 points by j_not_j 3y ago|0 comments
25.
by j_not_j 3y ago
Depending on your definition of "current chips". Clear Linux OS defines its minimum hardware requirements to be second-generation Intel® microarchitecture code name Westmere (released in 2010) or later. source: https://
26.
by j_not_j 3y ago
> FPGA LUTs are just way too slow If, and of course that is a big if, you can repackage a (parallelizable) calculation into FPGA look-up tables and implement multiples of this (e.g. 8 to 80 times) then you can think maybe it's quick
27.
by j_not_j 3y ago
True this. I tried it once a long time ago; it failed to find the sqlite3 command (back when SQLite was part of base). I spent way too much time debugging a sqlite-based script until I noticed /usr/bin/sqlite3 was still on m
28.
by j_not_j 3y ago
For OpenBSD, only 512MB is needed even with the kernel relinks. Or so my experience with virtual machines says. I sometimes run two VMs at 512MB each on my 4GB Windows 10 laptop. And I can use Windows apps too at the same time. (VMware w
29.
by j_not_j 3y ago
He lost me at "ssh root@machine". Just no.
30.
by j_not_j 3y ago
The assumption appears to be "one" Mars habitat, with a lot of engineered systems to support human (and other) life. Three would be better, and each should be capable of supporting the population of one of the others (that is, mea

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