The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Power User’ Category

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The CPU load average metric often is not a good one to alert on

Posted by jpluimers on 2023/04/20

Boy I wish threads with more than one person could be saved by the ThreadReaderApp.

Anyway:

[WayBack] Thread by @mipsytipsy: oh boy.. i was just idly musing over how the single most ubiquitous/useless metric is “CPU load average”, lol i wonder if you could use CPU…

Jun 4th 2020

oh boy.. i was just idly musing over how the single most ubiquitous/useless metric is “CPU load average”, lol

i wonder if you could use CPU load alerts to score how modern and powerful a team’s toolchain is, like a Waffle House Index for tooling. 🤔

 

…oh oh! but i was gonna say, this thread between @drk and @shelbyspees is a killer nanotutorial in how to ask better questions about your code — where to start, how to drill down and dig in, how to instrument, and how to approach such an open-ended exploratory jaunt. 👏🐝❤️

it’s a really good illustration of this thing we end up saying all the time, which is “don’t fear the future, it is simpler and clearer and *easier* here! the way you are doing it NOW is the hard way!” 😖

time for cpu load average to go the way of the PC LOAD LETTER …

0:00
/ 0:01

 

 

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Posted in *nix, Cloud, Development, DevOps, Infrastructure, Power User, Software Development, Systems Architecture | Leave a Comment »

xxd examples of big/little/middle endianness (thanks @jilles_com!)

Posted by jpluimers on 2023/04/18

Cool one-liner program via [Archive] Jilles🏳️‍🌈 (@jilles_com) / Twitter:

for s in 0123456789ABCDEF 172.16.0.254 Passwd:admin;do echo -en "Big    Endian: $s\nMiddle Endian: ";echo -n $s|xxd -e -g 4 | xxd -r;echo -en "\nLittle Endian: ";echo -n $s|xxd -e -g 2 | xxd -r;echo -en "\nReversed     : ";echo -n $s|xxd -p -c1 | tac | xxd -p -r;echo -e "\n";done

Note that the hex are bytes, not nibbles, so the endianness is OK:

Image

Big Endian: 0123456789ABCDEF
Middle Endian: 32107654BA98FEDC
Little Endian: 1032547698BADCFE
Reversed : FEDCBA9876543210

Big Endian: 172.16.0.254
Middle Endian: .2710.61452.
Little Endian: 71.2610.2.45
Reversed : 452.0.61.271

Big Endian: Passwd:admin
Middle Endian: ssaPa:dwnimd
Little Endian: aPssdwa:mdni
Reversed : nimda:dwssaP

That nibble/byte thing confused me at first (as I associate hexadecimal output with hex dumps, where each hexadecimal character represents a nibble)) so here are some interesting messages from the thread that Jilles_com started:

Some related man pages:

–jeroen

Posted in *nix, *nix-tools, bash, Development, Power User, Scripting, Software Development, xxd | Leave a Comment »

Berlin Typography on Twitter: “The best of #TypeInBerlin: The tʒ and ſʒ ligatures, together at last.” / Güntʒelstraſʒe == Güntzelstraße

Posted by jpluimers on 2023/04/17

Learned a new thing a while ago: I knew about the ſʒ ligature (that nowadays usually is written as ß), but the tʒ ligature was new to me.

So: Güntʒelstraſʒe == Güntzelstraße.

References:

Source: [Archive.is] Berlin Typography on Twitter: “The best of #TypeInBerlin: The tʒ and ſʒ ligatures, together at last. …” / Twitter

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Posted in Development, Encoding, LifeHacker, Power User, Software Development, Unicode | Leave a Comment »

Low power timers for 6 hour on / 18 hours off in 24 hours time

Posted by jpluimers on 2023/04/14

Some notes, as in 2021, I started to see a lot of LED lights (often even LED string lights) being able to automatically do 6 hour on and 18 hour off in a 24 hour cycle to conserve battery usage and improve convenience.

Below are some links, as I might want to create such a circuit myself, maybe even with some solar charging. I’m especially interested to power these off 18650 Li-Ion batteries of which I wrote before (especially as you can easily salvage them from laptop or even e-bike battery packs).

Links via [Wayback/Archive] chip timer 6 hour per 24 hours – Google Search and [Wayback/Archive] microcontroller 6 hour on 18 off timer – Google Search:

–jeroen

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Posted in 18650, Batteries, Hardware, Li-Ion, LifeHacker, Power User | Leave a Comment »

Some links on configuring MikroTik equipment as multiple switches (or even routers) using RouterOS

Posted by jpluimers on 2023/04/13

MikroTik switches and routers are very flexible to configure, as everything is done through [Wayback/Archive] RouterOS settings.

This means that given enough ports, you can split a physical switch into logical switches. This can be very convenient when you run multiple networks without VLAN.

Earlier this week, I already wrote about Torching a specific port on a MikroTik switch or router running RouterOS which involved turning off hardware acceleration off for specific ports in order to have the flow through the underlying switch chip prohibiting torch and filter features.

For splitting noticing which ports are connected to which switch chip is also important: splitting works best if you can configure each logical switch to exclusively use network ports on one switch chip.

This post was to both research how to configure this, and if my MikroTik devices would allow for hardware acelleration.

Here are some links that should help me with configuring (via [Wayback/Archive] mikrotik split switch in two – Google Search):

–jeroen

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Posted in Development, Hardware, MikroTik, Network-and-equipment, Power User, RouterOS, routers, Scripting, Software Development | Leave a Comment »

Torching a specific port on a MikroTik switch or router running RouterOS

Posted by jpluimers on 2023/04/11

On most recent [Wayback/Archive] RouterOS configurations of MikroTik Routers and Switches, running [Wayback/Archive] Torch a port will show zero traffic when they are part of a bridge configuration. The same holds for the Packet Sniffer.

The reason is that these bridges have hardware acceleration turned on, which makes all traffic go through the switch chip instead of the device CPU. Torch works on the CPU level, so won’t show hardly any traffic except for some configuration stuff (depending on the combination of switch chip and CPU type).

This is not documented in the Torch documentation, but it is documented in the Packet Sniffer documentation.

Further reading:

–jeroen

Posted in Development, Hardware, MikroTik, Power User, RouterOS, routers, Scripting, Software Development | 1 Comment »

DPReview archives: how accessible will they be?

Posted by jpluimers on 2023/04/10

There are various posts indicating part or all of DPreview will be archived:

  1. [Wayback/Archive] DPReview closure: an update: Digital Photography Review
  2. [Wayback/Archive] The Wayback Machine on Twitter: “@jpluimers @geerlingguy @internetarchive We are “on it””
  3. [Wayback/Archive] DPReview – Archiveteam
  4. [Wayback/Archive] Digicam Finder · The most complete and accurate digital camera data source on the internet (1994 — 2023)  which is open source at [Wayback/Archive] open-product-data/digital-cameras: The most complete and accurate digital camera* data on the internet, assembled and maintained by the community. (via [Wayback/Archive] Good news — the camera feature search and all data is saved | Migration | DPRevived)

I wonder how accessible each form of archive will be. The last entry in the above list is very accessible, but only has the camera data (which is a very important aspect, but do not underestimate the forum with millions of posts either).

–jeroen

Posted in ArchiveTeamWarrior, Internet, InternetArchive, Photography, Power User | Leave a Comment »

True Phone – How to enable Call Recording – YouTube, and where the recordings are stored

Posted by jpluimers on 2023/04/10

From [Archive] True Phone – How to enable Call Recording – YouTube:

True Phone Dialer & Contacts & Call Recorder is a free Android app. Get it here https://play.google.com/store/apps/de…

There are two ways to enable Call Recording

Way

  1. Open True Phone settings, Incoming / Ongoing call screens
  2. Select Ongoing call screen and manually change buttons layout

Way

  1. Open True Phone settings, Incoming / Ongoing call screens
  2. Scroll down and select Call Recording, enable it, accept the Disclaimer
  3. Record button will be added automatically

With ES File Explorer had a quick look where the calls are being stored and how they are named.

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Posted in Android Devices, OnePlus Six, Power User, Uncategorized | Leave a Comment »

OpenVPN somehow failed when tethering on the Android mobile hotspot from a new phone

Posted by jpluimers on 2023/04/07

A while after I got a new smartphone, I noticed that when my MacBook was connected over Wi-Fi to the mobile hotspot of my Android phone, the Tunnelblick connections over OpenVPN to my family members would not work. A telnet from the Android phone to the OpenVPN TCP port 1194 woud succeed, but not from the MacBook. Connecting from the phone using JuiceSSH to the OpenSSH endpoints at those family members would work too, so I was a bit flabbergasted.

In the end this seems to be a set of coincidences that fails in this particular setup, but I am not totally aware why.

The solution was to both re-configure the APN (Access Point Name) the smartphone uses to connect to the internet from ipv4/ipv6 to ipv4, and to reboot the phone.

For Dutch provider KPN Mobile, the APN is named internet and apparently changed default to ipv4/ipv6 without properly supporting ipv4. Note the configuration parameters are all lowercase, although they should be written IPv4 and IPv6.

Here are a few posts that got me on the right track (all via [Wayback/Archive] openvpn fails over android hotspot – Google Search):

Note that sometimes the MTU can cause similar failures:

Note too: some links to check for OpenVPN responding are below.

Various sites with (often different) APNs that KPN mobile supports:

There are quite a few APNs, some with firewall and/or proxy and/or compression, some with external IP address (which means your smartphone really needs a firewall).

–jeroen

Posted in Android Devices, Hardware, Network-and-equipment, OpenVPN, Power User, VPN | Leave a Comment »

Need to take a look a Scoop (as a long time Chocolatey user)

Posted by jpluimers on 2023/04/06

Based on

So:

Related blog posts:

–jeroen

Posted in Chocolatey, Power User, Scoop, Windows, winget | Leave a Comment »

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