Reference Request – Which book or books are used in these lectures on distributed systems?

Please have a look at these lecture notes.

The instructor suggests studying books Tanenbaum along with its included reading list. But I find no substantive agreement between the slides of the lectures and TanenbaumBooks and other reading material.

For example, take the following slides from Lecture # 2:

Enter the image description here

Where did these pictures come from?

Please give me suggestions for all books or additional reading material.

Control Systems – Accelerate Reduce and NSolve calculations

I have a nonlinear equation system with numerical parameter values ​​(see below). I tried it first FindRoot with given initial values ​​and it did not converge. Then I tried To reduce With Reals Solutions, but it works forever and finally I tried NSolve, I stand before the infinite calculation. This forum is my last resort to solve the following simple system that can be easily solved by hand. The following system is a simple applied general equilibrium model in which the coefficients were calibrated using a social accounting matrix.

Comments are appreciated.

NSolve[{
  QA1 == 3.33 QF11^0.48 QF21^0.52, 
  QA2 == 2.904 QF12^0.39 QF22^0.67, 
  WF1 == (0.48 PVA1 QA1)/QF11, 
  WF1 == (0.39 PVA2 QA2)/QF12, 
  WF2 == (0.52 PVA1 QA1)/QF21, 
  WF2 == (0.61 PVA2 QA2)/QF22, 
  QINT11 == 0.24 QA1,
  QINT12 == 0.13 QA2,
  QINT21 == 0.16 QA1,
  QINT22 == 0.19 QA2,
  PA1 == P1, 
  PA2 == P2, 
  PVA1 == (-0.24 P1 - 0.16 P2) PA1, 
  PVA2 == (-0.13 P1 - 0.19 P2) PA2, 
  Q1 == QA1, Q2 == QA2,
  YF11 == 0.52 (QF11 WF1 + QF12 WF1), 
  YF12 == 0.59 (QF21 WF2 + QF22 WF2), 
  YF21 == 0.47 (QF11 WF1 + QF12 WF1), 
  YF22 == 0.41 (QF21 WF2 + QF22 WF2), 
  YH1 == YF11 + YF12, 
  YH2 == YF21 + YF22, 
  QH11 == (0.25 YH1)/P1, 
  QH12 == (0.48 YH2)/P1, 
  QH21 == (0.5 YH1)/P2,
  QH22 == (0.32 YH2)/P2, 
  QINV1 == 25 IADJ, 
  QINV2 == 55 IADJ, 
  QF11 + QF12 == 152,
  QF21 + QF22 == 203, 
  Q1 == QH11 (QINT11 + QINT12) + QH12 (QINT11 + QINT12) + QINV1, 
  Q2 == QH21 (QINT21 + QINT22) + QH22 (QINT21 + QINT22) + QINV2, 
  0.45 P1 + 0.55 P2 == 1
  },
  {
  IADJ, P1, P2, PA1, PA2, WF1, WF2, PVA1, PVA2, Q1, Q2, QA1, QA2, YH1, YH2, 
  QF11, QF12, QF21, QF22, QH11, QH12, QH21, QH22, QINT11, QINT12, QINT21, 
  QINT22, QINV1, QINV2, YF11, YF12, YF21, YF22
  }, Reals]

Operating Systems – How exactly does a CPU perform process planning?

Theoretically, I know how different scheduling algorithms work, e.g. Round robin, where each process gets small time slices to execute some statements before the operating system passes execution to the next process, and so on.

What I do not understand is how that's possible. The operating system is just some code, and so are all processes. Why does not that happen?

  1. OS passes execution to the first process.
  2. Now that this process is running, the operating system can not stop it because the CPU can only execute one instruction at a time, and that instruction is the process.
  3. Now the operating system has no control over the process and can not stop it.

Of course, that does not happen now, but why not? How would the operating system say something like, "Okay, you can now execute 3 instructions, but then have the other process executed"?

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Defense – Rules for productive data in test systems

When I look at best practices for using test systems, I think of the following two topics:

One of the best practices for having productive data in test systems is, for example: have a retention period until the actual deletion of this data and complete logging.

Again and again, I hear the argument that log files require a lot of storage capacity, which spend a fair amount of money to use for storage. Therefore, it has been proposed to activate this only for the critical actions, e.g. Deletion, exports. My question is, is not this still a problem because you do not have complete traceability of user actions from a risk perspective?

Deleting productive data in test systems:
I know that due to GDPR erase periods, especially in PII productive data in the test system plays an important role. But what is the risk if you do not have GDPR data in the test system and do not delete it regularly?

Hide form model data in subsequent RazorPage navigation systems ASP.Net Core

I have a RazorPage with a form that takes on a complex data model.
It has these properties:
recipient address
EmpfängerZip
Delivery city

The page should be shared with an employee. That is, I share with you a link that contains a GUID to fill out your address for a collaboration tool.

The problem is that if the associate navigates to the page after the employee completes the page, the subscriber can see the information entered by the employee. So if I share the page with you, fill it out and navigate back to it. I can see your address, city and zip code.

Not very user friendly, since we are strangers.
Are there any simple techniques for hiding model data in sequence navigation with asp.net core and asp.net core mvc on a razor page?

Many Thanks!

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Operating Systems – Which is the lightest ready-to-use pentesting distribution x86 / x64 since 2019?

I've done some research and it seems that AttackPup (based on Puppy Linux) was the smallest ready-to-use distribution for penetration testing. Unfortunately, the project has not been updated since 2010.

BlackArch looks well-groomed and, based on Arch Linux, it only needs 128 MB of RAM to run properly, but almost 18 GB of free hard disk space. I wonder if anyone knows alternatives that are worth a look.