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 ‘Fun’ Category

Cable salad is of all times: 1964 analog computers; Moog syntesizers

Posted by jpluimers on 2019/08/01

This picture on Flickr of Engineer Karen Leadlay in an analog computer lab at General Dynamics, January 1964 shows that cable salad is of all times.

Atlas Collection Image


The above threads have really nice comments, including pointers to for instance the [WayBack] Moog synthesizer – Wikipedia  (lots of you remember the songs by Keith Emerson).


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Posted in Development, Fun, Hardware Development | Leave a Comment »

Laptop fan profiling, and debugging them – related to Profiling | CommitStrip

Posted by jpluimers on 2019/07/23

A while back, I posted the “profiling” CommitStrip on[WayBack] Profiling – Jeroen Wiert Pluimers – Google+. Boy how did I not know that within a week, I bumped into a “laptop fan profiling” artefact.

A coworker noticed, that when starting a thread based equivalent of [WayBack] TTimer Class (which cannot be used in services as it depends on the VCL), then sometimes the laptop fans would spin up.

What basically happened was that for certain combinations of Enabled and Interval the Execute would loop burning 100% of one CPU core.

With 3 or more – sometimes 2 – of these threads active on a 4+4 core (4 are hyper-threaded), the processor fan would start to spin like madness.

Finding the solution was somewhat easy too:

  • Process Explorer would show the thread IDs burning the most CPU cycles
  • Delphi shows the Thread IDs in the Thread Status pane (if they are named, the ID is at the end of the name in parenthesis)
  • At around Delphi 2010, you can Freeze or Thaw threads. This allows you to debug only a single thread by freezing all others.

Focussing on one thread, allowed a close inspection of the loop, quickly finding the actual cause and repairing it.

TTimer Thread

A similar and better class is at [WayBack] multithreading – TTimerThread – Threaded timer class – Code Review Stack Exchange, based on [WayBack] timer – Using VCL TTimer in Delphi console application – Stack Overflow.

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Posted in Conference Topics, Conferences, Debugging, Delphi, Development, Event, Fun, Multi-Threading / Concurrency, Profiling-Performance-Measurement, Software Development | Leave a Comment »

XKCD – Making Progress: lots of problems

Posted by jpluimers on 2019/07/10

I think the alt-text is even better than the cartoon itself:

I started off with countless problems. But now I know, thanks to COUNT(), that I have “#REF! ERROR: Circular dependency detected” problems.

Source: [WayBackXKCD 1906: I started the day with lots of problems. But now, after hours and hours of work, I have lots of problems in a spreadsheet.


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Posted in Agile, Development, Fun, Quotes, Software Development | Leave a Comment »

+Stefan Glienke​ at EKON21: I don’t count sheep, I count references.

Posted by jpluimers on 2019/07/08

+Stefan Glienke​ at EKON21:

I don’t count sheep, I count references.

Response from +Roald van Doorn​:

When you reach -1 you wake up from a nightmare.

Source: [WayBackJeroen Wiert Pluimers – G+

Posted in Conferences, EKON, Event, Fun, Quotes, T-Shirt quotes | Leave a Comment »

Geek And Poke: The New Developer

Posted by jpluimers on 2019/07/03

Old, but still so funny because it is so true: [WayBackGeek And Poke: The New Developer



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Posted in Comics, Development, Documentation Development, Fun, Quotes, Software Development | Leave a Comment »

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