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

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Archive for July 7th, 2021

During software quality courses, I always explain to avoid abbreviations and acronyms as they are very domain specific. It seems authz, authn differ. As do a11n,

Posted by jpluimers on 2021/07/07

Each time I teach or talk about software quality, I stress that you should not use abbreviations nor acronyms as they confuse people and make communication a lot harder.

This is not just because acronyms and abbreviations are domain specific, which makes it harder to switch domains, but also because it raises the level for people coping with things like wordblindness or dyslexia.

Recently, two new abbreviations seem to have popped up: authn and authz (don’t you love it that Wikipedia has links for them, but does not explain them?). At first I thought it had something to do with who authored some bits of a system. But I was wrong:

[WayBack] Ian Coldwater 📦💥✨ on Twitter: “authn == authentication authz == authorization… “

For an all-inclusion point of view, I was amazed at for instance a11n, and I am not alone:

[WayBack] Thread by @MattGrayYES: “Here’s a question: When I see people tweet about accessibility they hashtag . What links allies to accessibility? Googling didn’t help […]” #ally

Here’s a question: When I see people tweet about accessibility they hashtag #ally. What links allies to accessibility?
Googling didn’t help

Hahaha apparently it’s a11y not ally, as an abbreviation of accessibility. Is that ironic or what. How is anyone meant to know that‽

Apparently some people can’t be bothered to write the eleven letters between the a and the y, so swap it for “11”
Now I think of it, writing like that is so easy to read!
I3l f3d b7t: h2h b4s, s6s, b3n, b3k p5g a1d b3d b3s.

Add to that things like l10n or i18n, and dozens of other abbreviations and slowly your brain will start to melt until you realise it is too late.

So pick up your autocorrect, typing completion and other automation systems and lets get rid of acronyms and abbreviations.

Because we deserve better.

–jeroen

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Posted in Agile, Code Quality, Development, Software Development | Leave a Comment »

SetProcessWorkingSetSize: you hardly – if ever – need to call this from your process

Posted by jpluimers on 2021/07/07

There are quite a few posts that recommend using SetProcessWorkingSetSize to trim your process working set, usually in the SetProcessWorkingSetSize(ProcessHandle, -1, -1) form:

[WayBack] SetProcessWorkingSetSize function (winbase.h) | Microsoft Docs

Sets the minimum and maximum working set sizes for the specified process.

BOOL SetProcessWorkingSetSize(
  HANDLE hProcess,
  SIZE_T dwMinimumWorkingSetSize,
  SIZE_T dwMaximumWorkingSetSize );

The working set of the specified process can be emptied by specifying the value (SIZE_T)–1 for both the minimum and maximum working set sizes. This removes as many pages as possible from the working set. The [WayBack] EmptyWorkingSet function can also be used for this purpose.

In practice you hardly ever have to do this, mainly because this will write – regardless of (dis)usage – all of your memory to the pagefile, even the memory your frequently use.

Windows has way better heuristics to do that automatically for you, skipping pages you frequently use.

It basically makes sense in a few use cases, for instance when you know that most (like 90% or more) of that memory is never going to be used again.

Another use case (with specific memory sizes) is when you know that your program is going to use a defined range of memory, which is outside what Windows will heuristically expect from it.

A few more links that go into more details on this:

  • [WayBack] windows – Pros and Cons of using SetProcessWorkingSetSize – Stack Overflow answers by:
    • Hans Passant:

      SetProcessWorkingSetSize() controls the amount of RAM that your process uses, it doesn’t otherwise have any affect on the virtual memory size of your process. Windows is already quite good at dynamically controlling this, swapping memory pages out on demand when another process needs RAM.

      By doing this manually, you slow down your program a lot, causing a lot of page faults when Windows is forced to swap the memory pages back in.

      SetProcessWorkingSetSize is typically used to increase the amount of RAM allocated for a process. Or to force a trim when the app knows that it is going to be idle for a long time. Also done automatically by old Windows versions when you minimize the main window of the app.

    • Zack Yezek:

      The only good use case I’ve seen for this call is when you KNOW your process is going to hog a lot of the system’s RAM and you want to reserve it for the duration. You use it to tell the OS “Yes, I’m going to eat a lot of the system RAM during my entire run and don’t get in my way”.

    • Maxim Masiutin:

      We have found out that, for a GUI application written in Delphi for Win32/Win64 or written in a similar way that uses large and heavy libraries on top of the Win32 API (GDI, etc), it is worth calling SetProcessWorkingSetSize once.

      We call it with -1, -1 parameters, within a fraction of second after the application has fully opened and showed the main window to the user. In this case, the SetProcessWorkingSetSize(... -1, -1) releases lots of startup code that seem to not needed any more.

  • [WayBack] c# – How to set MinWorkingSet and MaxWorkingSet in a 64-bit .NET process? – Stack Overflow answer by Hans Passant:

    Don’t pinvoke this, just use the Process.CurrentProcess.MinWorkingSet property directly.

    Very high odds that this won’t make any difference. Soft paging faults are entirely normal and resolved very quickly if the machine has enough RAM. Takes ~0.7 microseconds on my laptop. You can’t avoid them, it is the behavior of a demand_paged virtual memory operating system like Windows. Very cheap, as long as there is a free page readily available.

    But if it “blips” you program performance then you need to consider the likelihood that it isn’t readily available and triggered a hard page fault in another process. The paging fault does get expensive if the RAM page must be stolen from another process, its content has to be stored in the paging file and has to be reset back to zero first. That can add up quickly, hundreds of microseconds isn’t unusual.

    The basic law of “there is no free lunch”, you need to run less processes or buy more RAM. With the latter option the sane choice, 8 gigabytes sets you back about 75 bucks today. Complete steal.

  • [WayBack] c++ – SetProcessWorkingSetSize usage – Stack Overflow answer by MSalters:

    I had an application which by default would close down entirely but keep listening for certain events. However, most of my code at that point would not be needed for a long time. To reduce the impact my process made, I called SetProcessWorkingSetSize(-1,-1);. This meant Windows could take back the physical RAM and give it to other apps. I’d get my RAM back when events did arrive.

    That’s of course unrelated to your situation, and I don’t think you’d benefit.

  • [WayBack] delphi – When to call SetProcessWorkingSetSize? (Convincing the memory manager to release the memory) – Stack Overflow

    If your goal is for your application to use less memory you should look elsewhere. Look for leaks, look for heap fragmentations look for optimisations and if you think FastMM is keeping you from doing so you should try to find facts to support it. If your goal is to keep your workinset size small you could try to keep your memory access local. Maybe FastMM or another memory manager could help you with it, but it is a very different problem compared to using to much memory.

    you can check the FasttMM memory usage via FasttMM calls GetMemoryManagerState and GetMemoryManagerUsageSummary before and after calling API SetProcessWorkingSetSize.

    I don’t need to use SetProcessWorkingSetSize. FastMM will eventually release the RAM.


    To confirm that this behavior is generated by FastMM (as suggested by Barry Kelly) I crated a second program that allocated A LOT of RAM. As soon as Windows ran out of RAM, my program memory utilization returned to its original value.

  • [WayBack] delphi – SetProcessWorkingSetSize – What’s the catch? – Stack Overflow answer by Rob Kennedy:

    Yes, it’s a bad thing. You’re telling the OS that you know more about memory management than it does, which probably isn’t true. You’re telling to to page all your inactive memory to disk. It obeys. The moment you touch any of that memory again, the OS has to page it back into RAM. You’re forcing disk I/O that you don’t actually know you need.

    If the OS needs more free RAM, it can figure out which memory hasn’t been used lately and page it out. That might be from your program, or it might be from some other program. But if the OS doesn’t need more free RAM, then you’ve just forced a bunch of disk I/O that nobody asked for.

    If you have memory that you know you don’t need anymore, free it. Don’t just page it to disk. If you have memory that the OS thinks you don’t need, it will page it for you automatically as the need arises.

    Also, it’s usually unwise to call Application.ProcessMessages unless you know there are messages that your main thread needs to process that it wouldn’t otherwise process by itself. The application automatically processes messages when there’s nothing else to do, so if you have nothing to do, just let the application run itself.

–jeroen

Posted in .NET, C, C++, Delphi, Development, Software Development, Windows Development | Leave a Comment »

Counting bugs versus talking about them: a learning opportunity

Posted by jpluimers on 2021/07/07

Counting bugs (or issues for that matter) tells you exactly nothing. Numbers need context, so you need to discuss context. If there the number feels large, you do not even need an exact number: you already are in trouble.

More about this in this excellent twitter thread:

[WayBack] Thread by @michaelbolton: “1) Thinking about counting things to measure quality? You might be able to measure some things that bear on quality. By contrast, you ca […]”

  1. 1) Thinking about counting things to measure quality? You might be able to measure *some things* *that bear on* quality. By contrast, you can’t measure quality itself (as @jamesmarcusbach has said), but you can discuss it.Consider this: s/how many/let’s talk about each/g/
  2. When you suggest “let’s talk about each bug”, you might hear (or think) “No way! We have too many bugs to talk about each one! Let’s just count them instead!” If so, you can already infer some crucial things about the product and project, with no need to bother counting. /
  3. Of course, those inferences are only inferences, not facts. So investigate. When you do, you might be tempted to start counting bugs. But you’ll probably want to make sure that your count is appropriately accurate, precise, valid, reliable… So you need to examine each one. /
  4. Examining and evaluating each bug sounds like a pain. It is, to a degree. Few people like washing or repairing dirty linen in public. Yet a bug is not just a problem; it’s also an opportunity to learn some things. When you count instead of study, you lose that opportunity. /
  5. I love studying bugs. When I study bugs, I can become aware of certain things that go wrong, and some of those things get embedded into tacit knowledge. I can apply that knowledge, maybe consciously, maybe sub-, while testing, pairing with a developer, or coding myself. /
  6. In Rapid Software Testing, we suggest this: when someone asks for a number or a measurement, avoid misleading them by giving them a scalar. Consider offering a description, an assessment, a report, or a list. If you can describe and summarize, you might not NEED a number. /
  7. When you *are* offering a number, it had better be a valid number. When you count items, each item being counted had better be /commensurate/. That is, you must know the difference between “one of these” and “NOT one of these”. You must know how to count to one. /
  8. For a count to make sense, items must be commensurate—of describable size, weight, duration, significance, value, etc. etc., on a scale that people agree upon, accept, *and understand*. Otherwise communication will go pear-shaped in no time. /
  9. To go seriously about the business of getting a *valid* count, you’ll need to examine every bug. To do good analysis work, there’s no getting out of that. The same general principle applies to counting test cases, or “defect escapes”, or “invalid bug reports”. All of them. /
  10. “But management wants numbers!” I doubt that. Management almost certainly wants *to know things*—and from testers, knowledge about the status of the product and problems that threaten its value. Numbers might help to illustrate a story. They don’t, can’t TELL it. Words can. /
  11. Don’t be cowed into giving numbers without context. When asked for them, consider replying “misleading you is not a service that I offer,” and immediately offering a summarized, meaningful description of the state of factors that matter to people who are important. /
  12. All this applies to reports about the status or quality of the product, of the testing, of the project. And it applies to the work of individual testers, too. As an alternative to *measuring* something, analyze it, describe it, assess it, discuss it. Don’t just keep score. /
  13. What might we evaluate a tester’s work? Here’s an example set of elements of excellent testing:

    . It may not be complete, comprehensive, or tailored to your context. If it isn’t, revise it; fix it to fit. /

  14. Evaluating testers’ work? Go through the list and ask “are we happy with the tester’s work with respect to this element?” If Yes, great. If it’s outstanding, considering analyzing and then sharing that tester’s approaches with others; point out positive deviance from norms. /
  15. Unhappy with some element of the tester’s work? Talk about it. Discuss it. Maybe the tester needs to improve it through focus and deliberate practice; maybe the tester needs pairing and collaboration; or maybe others on the team can handle that element just fine. /
  16. As testers, we (supposedly) specialize in evaluating the quality of things via interaction, observation, experience with them. We consider quality criteria: capability, reliability, usability, charisma, security, scalability, compatibility, performance,… /
  17. People aren’t products, of course. And there are patterns common to evaluating the quality of anything: factors that make people happy or bring them value, or that in their absence trigger disappointment, loss, harm, or diminished value. But “Capability: 6” tells us little. /
  18. I was a program manager for a best-selling product. I would never have conceived of shipping a product (or not) by reading a scoring table. I didn’t care about metrics, test case counts, or bug counts. I needed relevant, concise stories about testing and bugs. /
  19. So: avoid agonizing about “measuring quality”. Consider instead learning to tell the product story, the testing story, and the quality-of-testing story. Talk about what’s OK, and move quickly to problem that threaten the product or project. [WayBack] developsense.com/blog/2018/02/h…
Postscript to this thread: in the middle of my writing it, the Twitter client on my iPad got into a state where it was accepting additions to the thread, but when it came time to send them out, the “Tweet All” button was greyed out. Anticipating a problem, I took screen shots. /

Predictably, the active “Cancel” button DID work, and the text was all lost. But, thanks to screen shots, for once I had a backup and was able to recover my work. It took time, but at least I could do it.

A user in this position doesn’t care about bug COUNTS. Only about the bug.

–jeroen

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Posted in Development, Software Development, Testing | Leave a Comment »

 
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