Ciro Santilli @cirosantilli 37

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Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

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Ciro Santilli's hardware / WD Elements 20TB by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

Bought December 2023 for 300 pounds, so 15 pounds / TB. Needs power supply unfrotunately besides USB, the largest one without needing power supply was only 5 TB at the time so not worth it, given that my P14s alreay carriers 2 TB. 10x is a must for the external crap.

www.westerndigital.com/en-gb/products/external-drives/wd-elements-desktop-usb-3-0-hdd?sku=WDBWLG0030HBK-EESN (archive)

Noise: it has a constant pleasant hum, with a not so nice click every 5 seconds or so. Reasonable, but not amazingly incredible.

The size is reasonable, not megaportable, but definitely reasonable.

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Ciro Santilli's hardware / WD10EADS-42P6B0 by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

~1TB.

Has a separate power cord, not USB powered. Unbelievable. Edit: actually high ends are still like that as of 2023, e.g. at that time, a the max non-cabled was 5 TB, but top of line was 20 TB.

Disk label: wd1t.

Ubuntu 20.04 gnome-disks benchmark, ext4 partition: 37MB/s.

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Ciro Santilli's hardware / P14s cannot dual monitor on Wayland by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

Asked:

On Ubuntu 23.10, under Settings > Displays, Mirror works, but "Join" does not allow to Apply with message:

Changes Cannot be Applied. This could be due to hardware limitations.

Works on X Window System, it is a Wayland bug.

Related:

for 3rd monitor

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Ciro Santilli's hardware / P14s benchmark by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

glmark2 -b build:duration=3:model=horse

~22K

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Ciro Santilli's hardware / P51 hardware by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

lspci

output:

00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v6/7th Gen Core Processor Host Bridge/DRAM Registers (rev 05)
00:01.0 PCI bridge: Intel Corporation 6th-10th Gen Core Processor PCIe Controller (x16) (rev 05)
00:08.0 System peripheral: Intel Corporation Xeon E3-1200 v5/v6 / E3-1500 v5 / 6th/7th/8th Gen Core Processor Gaussian Mixture Model
00:14.0 USB controller: Intel Corporation 100 Series/C230 Series Chipset Family USB 3.0 xHCI Controller (rev 31)
00:14.2 Signal processing controller: Intel Corporation 100 Series/C230 Series Chipset Family Thermal Subsystem (rev 31)
00:15.0 Signal processing controller: Intel Corporation 100 Series/C230 Series Chipset Family Serial IO I2C Controller #0 (rev 31)
00:16.0 Communication controller: Intel Corporation 100 Series/C230 Series Chipset Family MEI Controller #1 (rev 31)
00:17.0 SATA controller: Intel Corporation Q170/Q150/B150/H170/H110/Z170/CM236 Chipset SATA Controller [AHCI Mode] (rev 31)
00:1c.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #1 (rev f1)
00:1c.2 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #3 (rev f1)
00:1c.4 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #5 (rev f1)
00:1d.0 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #9 (rev f1)
00:1d.4 PCI bridge: Intel Corporation 100 Series/C230 Series Chipset Family PCI Express Root Port #13 (rev f1)
00:1f.0 ISA bridge: Intel Corporation CM238 Chipset LPC/eSPI Controller (rev 31)
00:1f.2 Memory controller: Intel Corporation 100 Series/C230 Series Chipset Family Power Management Controller (rev 31)
00:1f.3 Audio device: Intel Corporation CM238 HD Audio Controller (rev 31)
00:1f.4 SMBus: Intel Corporation 100 Series/C230 Series Chipset Family SMBus (rev 31)
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection (5) I219-LM (rev 31)
01:00.0 VGA compatible controller: NVIDIA Corporation GM107GLM [Quadro M1200 Mobile] (rev a2)
01:00.1 Audio device: NVIDIA Corporation GM107 High Definition Audio Controller [GeForce 940MX] (rev a1)
04:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
3e:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM981/PM981/PM983
3f:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)

lspci -t

output:

-[0000:00]-+-00.0
           +-00.2
           +-01.0
           +-02.0
           +-02.1-[01]----00.0
           +-02.2-[02]----00.0
           +-02.4-[03]----00.0
           +-03.0
           +-04.0
           +-04.1-[04-63]--
           +-08.0
           +-08.1-[64]--+-00.0
           |            +-00.1
           |            +-00.2
           |            +-00.3
           |            +-00.4
           |            +-00.5
           |            \-00.6
           +-08.2-[65]--+-00.0
           |            \-00.1
           +-08.3-[66]--+-00.0
           |            +-00.3
           |            +-00.4
           |            \-00.6
           +-14.0
           +-14.3
           +-18.0
           +-18.1
           +-18.2
           +-18.3
           +-18.4
           +-18.5
           +-18.6
           \-18.7

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Ciro Santilli's hardware / P51 benchmark by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

glmark2 -b build:duration=3:model=horse

~4.8K

Monero 0.18.3.1 hashrate: 2.6 KH/s

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Ciro Santilli's hardware / Dell P2720D by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

27 Inch QHD (2560x1440) Monitor, 60Hz, IPS, 5ms, Ultrathin Bezel, 99% sRGB, DisplayPort, HDMI, 5x USB, 3 Year Warranty

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Ciro Santilli's hardware / Dell TODO by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

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Normalized DFT by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

There are actually two possible definitions for the DFT:

1/N, given as "the default" in many sources:
$x_{n} = \frac{1}{N} \sum_{k = 0}^{N - 1} X_{k} e^{i 2 π \frac{kn}{N}}$
(1)
$1/ N$ , known as the "normalized DFT" by some sources: www.dsprelated.com/freebooks/mdft/Normalized_DFT.html, definition which we adopt:
$x_{n} = \frac{1}{N} \sum_{k = 0}^{N - 1} X_{k} e^{i 2 π \frac{kn}{N}}$
(2)

The

1/ N

is nicer mathematically as the inverse becomse more symmetric, and power is conserved between time and frequency domains.

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Pelican (static site generator) by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

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Training machine learning on copyrighted data by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

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High pressure by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

Something weird happens when you keep squeezing by Vox (2023)

Source. Sodium becomes liquid when you compress it. Weird.

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3D file format by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

www.threekit.com/blog/gltf-everything-you-need-to-know comparision of several formats

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Star outside the Milky Way by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

It is not possible to see stars outside of the Milky Way by naked eye.

With telescopes however, it is possible. www.quora.com/Can-we-distinguish-individual-stars-in-other-galaxies-or-would-it-be-equivalent-to-say-we-know-there-are-other-forests-of-stars-galaxies-but-we-cant-tell-the-individual-trees-stars-What-is-the-farthest-individual/answer/Jerzy-Micha%C5%82-Pawlak contains an amazing answer that mentions two special cases of the furthest ones:

gravitational lensing observation
a star that is far but visible because its light is reflected by a nearby nebulae

But what we can definitely see are globular clusters of galaxies. E.g. the article en.wikipedia.org/wiki/Messier_87 basically gauges the size of galaxies by the number of globular clusters that they contain.

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High performance computing by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

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Darknet market by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

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Evergreen notes by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

Sample usage by Andy Matuschak (possible coiner): notes.andymatuschak.org/About_these_notes

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Rigid body dynamics by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

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Topology in condensed matter by

Ciro Santilli 37  Updated 2025-07-01  +Created 1970-01-01

topocondmat.org/

Previously on EdX: www.edx.org/learn/quantum-physics-mechanics/delft-university-of-technology-topology-in-condensed-matter-tying-quantum-knots "DelftX: Topology in Condensed Matter: Tying Quantum Knots".

But then they regained their sanity and put the source code on GitHub: github.com/topocm/topocm_content and is CC BY-SA.

Uses an ungodly combination of Jupyter notebooks and Pelican.

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