## How to test server’s peak draw on electrical amperage?

I’m moving my server to a co-location center and they’r not concerned with the actual wattage, which is what I’ve tracked, but they are very concerned with the peak amperage. They charge by the amps made available to the machine. Is there some industry standard way I can test that? The person I spoke with in the data center is a sales guys, so he’s not sure of the technical aspects that he’s asking me about.

If there’s a software solution, my system is an HP DL580 G7 running centos 7.

What I’ve tried:

I have a UPS on it now that gives wattage outputs which bounce all over the place. The highest I’ve seen is 800 watts, so my guess is 800watts/120volts should be six and two thirds amps. Do I provision 7 amps? Sounds a little flimsy.

Powerstat says “Device does not have any RAPL domains, cannot power measure power usage.” so I don’t think it’s compatible with my system.

Please let me know what the industry standards for this are.

## Drawing app that can draw on other apps

I’m looking for an app that I can use to draw on the screen while other apps are open. I’ve seen on this site mentioned in a old post an app Ink Over App, but the link is dead and the app isn’t available in Google play store.

Would anyone know of an app like this?

## How to draw 2 Graph

I must draw 2 graphs for Math. But I don’t know that, how. Graph 1.: it can’t be self-centered, and have a coherent centre and continues peripheral. Graph 2.: it can’t be self centered and have a incoherent centre and continues peripheral. How can I do that ? It’s very important for me, and sorry for my bad english. Thanks! 🙂

## Can Gate draw a creature larger that 20 feet in every dimension through the portal it creates?

The gate spell says:

When you cast this spell, you can speak the name of a specific creature (a pseudonym, title, or nickname doesn’t work). If that creature is on a plane other than the one you are on, the portal opens in the named creature’s immediate vicinity and draws the creature through it to the nearest unoccupied space on your side of the portal…

However, the size of the summoned portal is

5 to 20 feet in diameter.

What happens if you speak the name of a creature larger than 20 feet in diameter?

## How to draw an LTS based on the parallel process “|” in CCS Milner’s logic?

I’m trying to provide a Hennessy-Milner logic formula for CCS expressions that are not (strongly) bisimilar. An example with a sketch:

For each of the following CCS expressions, decide whether they are strongly bisimilar and if no, find a distinguishing formula in Hennessy-Milner logic.

$$b.a.Nil+b.Nil$$ and $$b(a.Nil+b.Nil)$$

I first draw these two to get a better understanding as follows (excuse my awful drawing skills but I couldn’t figure out how to put it in LaTeX so I used draw.io):

You can clearly see the Right Hand Side could do $$b.b$$ but the Left Hand Side can’t respond to that. And my distinguishing HML formula is $$[b]tt$$. On the LHS you get: $$[b]\{b.a.Nil+b.Nil\} = \emptyset$$ and on the RHS you get: $$[b]\{b(a.Nil+b.Nil), a.Nil+b.Nil\} = b(a.Nil+b.Nil)$$. Therefore this is a valid distinguishing formula.

Hopefully, I made what the exercise is about clear. Now, the following CCS expressions that I have to distinguish are:

$$a.Nil|b.Nil$$ and $$a.b.Nil + b.a.Nil$$.

I know how to draw the RHS because the + denotes a choice but I don’t have any idea of how the parallelism work in CCS and couldn’t understand it after reading. My guess is the following but it doesn’t make sense and is probably wrong:

Could someone help me understand how to sketch the LHS so that I can complete this exercise?

P.S My tags are probably not correct but I couldn’t find any tags to Hennessy-Milner logic, so feel free to edit them.

## How to draw these triangles in hyperbolic geometry?

In the triangular pyramid shown we consider four triangles (two right triangles on a common hinge unit length normal to a striped triangle with a dihedral $$\delta$$ angle and the outer big yellow triangle containing compound angle $$\gamma$$).

This is intended to derive Cosine Rule in Spherical trigonometry indirectly avoiding representation of sphere radius.

How to draw this figure in hyperbolic geometry,in order to arrive at

By applying Cosine Rule in striped triangle

$$c^2= \tan^2\alpha+\tan^2\beta-2\tan\alpha \tan\beta \cos \delta$$

By applying Cosine Rule in larger yellow triangle containing compound angle $$\gamma$$

$$c^2= \sec^2\alpha+\sec^2\beta-2\sec\alpha \sec\beta \cos \gamma$$

Eliminate $$c^2$$ to simplify we get Cosine Rule in spherical trigonometry

$$\cos \gamma= \cos\alpha\cos\beta+ \sin \alpha \sin \beta \cos \delta$$

Now how can one draw the corresponding figure in hyperbolic geometry:

$$\cos \gamma= \cosh\alpha\cosh\beta+ \sinh \alpha \sinh \beta \cos \delta \,?$$

For simpler cases the first relation can be drawn for right trianglee $$\delta= \pi/2$$..

but how to at least draw the latter pyramid yielding hyperbolic geometry result ?

$$\cos \gamma= \cos\alpha\cos\beta \, \rightarrow \cos \gamma= \cosh\alpha\cosh\beta \,?$$

Thanks in advance for geometric considerations in hyperbolic geometry without explicitly bringing in the pseudosphere.

Regards

## When should bold, italics, and colour be used to draw attention in a sentence?

Following is my signature on some other fora:

Interested in Drawing, Painting, and Crafts?
Please Commit to the Arts and Crafts Stackoverflow proposal!

I cannot show it here but the words “Drawing, Painting, and Crafts” besides being bold and italics, also have font colour green.

How to decide when to use bold, italics, and colour to draw attention in a sentence?

## Why potential draw- back of layering is that functionality at one layer may need information that is present only in another layer?

If a layer wants some data from another layer it can take it but how can it violate the layering rule

## How to write the method to draw a circle in Java?

The public class is already given (this is a HW) and all I need is to write the method that draws the unfilled circle.

The given public static is the following

char[][] kreis(char[][] zf, int xM, int yM, int r, char z)

and the middle point is (xM; yM) and of course the radius is (r) . And the equation given is this.

(x-xM)^2+(y-yM)^2 = r^2

However, here is why I can’t figure out how to do it: I need to write r^2 in java as r*r but also I’m instructed to use the “squareroot” through “Math.sqrt” and I’m confused as to what’s the purpose of the square root?