reference request – What happens when the head is in the leftmost cell and that an infinite time asks the Turing machine to move the head to the left?

I'm looking for articles with an explicit answer to the following question:

What happens when the head is placed in the leftmost cell and that an infinite time asks the Turing machine to move the head to the left?

The article "Theory of Infinite Time Calculable Models" contains the following succinct note:

The calculation stops only when the stop the state is explicitly obtained and, in this case, the output is the one that is written on the output tape. (If the head falls off the tape, no output is given.)

Does this mean that we can introduce a special program? Fault that occurs if the head falls off the tape, stops the calculation in exactly the same way as stop done but we have to ignore all the programs that reach the Fault State?

The article "The computing forces of Turing machines in infinite time on α-tape" contains the following information:

When the device is prompted to move the head to an undefined location, its default position is $ C_0 $. This occurs when a left move instruction occurs while the head is on a boundary ordinal cell because there is no "next cell left" determined in such cases.

I'm not sure that the notion of limit ordinal cell here includes the leftmost ($ 0-th) cell, but in all cases, the model of $ alpha $The Turing bands described in this document differ from the original model. This document is therefore not entirely relevant.

The first part of my question is: does anyone know of any other documents dealing with the problem? (I remember very well reading a detailed view of the problem in a document a few years ago, but for some strange reason, I can not find this document now.)

The second part of my question is: can we simply replace the instruction "move your head to the left" with the instruction "do not move your head" in such situations? That is, if the head is in the leftmost cell and the current instruction is "move the head to the left and go to the state $ s_i $", The machine does not move the head at all, but goes into state $ s_i $. Does such a solution in any way affect the computing power of Turing machines in infinite time?

How to extract the use of Kubernetes' main metrics over time – metrics-server

I'm using metrics-server in Kubernetes. How can I retrieve data for these primary metrics:

  • Number of modules running for each horizontal module over a given period
  • CPU usage at times
  • Number of failures / restarts over a period of time

linux – PostgreSQL takes a long time to start

I'm using the version of Postgre 10.9:

$ psql --version                                                         
psql (PostgreSQL) 10.9 (Ubuntu 10.9-0ubuntu0.18.04.1)

Recently I have just stopped my postgresql:

$ sudo /etc/init.d/postgresql stop                                             
( ok ) Stopping postgresql (via systemctl): postgresql.service.

and then I try to start again:

$ sudo /etc/init.d/postgresql start
(....) Starting postgresql (via systemctl): postgresql.service

But it takes a very long time, even if I wait more than 10 minutes.

When I try to CTRL + C that, and check the status, it remains inactive:

$ sudo /etc/init.d/postgresql status 
● postgresql.service - PostgreSQL RDBMS
   Loaded: loaded (/lib/systemd/system/postgresql.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Sun 2019-08-18 21:33:49 WIB; 30min ago
 Main PID: 2452 (code=exited, status=0/SUCCESS)

Agu 18 21:33:49 billpresta systemd(1): Stopped PostgreSQL RDBMS.
Agu 18 21:33:49 billpresta systemd(1): Stopping PostgreSQL RDBMS...
Warning: Journal has been rotated since unit was started. Log output is incomplete or unavailable.

I'm also trying to use the restart command:

$ sudo /etc/init.d/postgresql restart 
(....) Restarting postgresql (via systemctl): postgresql.service

also tried this command:

sudo service postgresql start

also tried with systemctl:

sudo systemctl start postgresql

But always the same, which takes a very long time.

So, what's wrong with that ..?, Help me please 🙂

three.js – GLSL Gradually changes the temperature (color) of the mesh over time

I write a little program using three.js.

I have made the mesh of the object PLY. And I want to heat polygons close to the position of the mouse. When I move the mouse, all nearby polygons must change color gradually to red, and other polygons must gradually return to their normal color over time.

I managed to get the mouse position and change the color of the nearest polygons, but I do not know how to solve the progressive fading for the other polygons.

Should I do it in shader or should I pass additional data to the shader?

YouTube watch time rules when someone is watching my two video channels, device, browser at the same time

I have 2 YouTube channels and one of my friends has subscribed to both channels. He says that sometimes he simultaneously opens my two video channels, using the same device and the same browser, but using different tabs.

  1. Will I see the time of watching in my two channels in this case?
  2. Will it be treated as an hour of spam monitoring in the future?
  3. Will I be faced with problems in this case in the future?
  4. Will it have an impact when I request monetization?

I had informed him that it was not a good approach and asked him to stop that, but he said that it was not a problem. Can any one please share your thoughts on this? Please advice. I am a new YouTuber, I am learning step by step. Waiting for your answers.

Optimization of the time execution of an algorithm

I have two formulas and I would like to test which one is the fastest and I would like to uantify the time difference between the two formulas.
The first is: sum (fi – p / (1 + x) ^ n)
The second is: sum (fi / (1 + x + y) ^ n)
for fi, x and n, I would like to test the speed of the two formulas in terms of p and y.
In particular, I would like to know how long it takes for each formula to achieve a result.
I remain at your disposal,
Thank you

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Time to install the FDC server

Is it normal for FDC servers to install a dedicated server for more than 4 hours?

With hivelocity and other dedicated server vendors, I … | Read the rest of

datetime – displays the current date and time of the MVC main net system

I want to display on the system screen the current and current date and time, indicating the clock incrementing the seconds ….

I've tried using (displays the date and time, but static, getting the time at which I loaded the page). (only displays the date). I've used DateTime.utcNow too, but it's equal to 1 case


public IActionResult RegistrarPonto()
            var aux = new RegistroPontoViewModel { DateTime = DateTime.Now };
            return View(aux);