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for a project of mine i need to detect the current incoming megabytes per second on linux coded in python.
i found someone elses code that does the correct thing but its coded in java and i dont exactly understand it. any pointers?
TOTAL_INCOMING_BYTES_FILE = "/sys/class/net/%s/statistics/rx_bytes",
final double current_mbps =
((current_total_bytes - Long.parseLong(Files.readAllLines(Paths.get(new File(String.format(TOTAL_INCOMING_BYTES_FILE, ETH_INTERFACE)).toURI())).get(0))) / 125000) * (-1);
i found someone elses code that does the correct thing but its coded in java and i dont exactly understand it.
Indeed Long.parseLong(Files.readAllLines(Paths.get(new File(String.format(TOTAL_INCOMING_BYTES_FILE, ETH_INTERFACE)).toURI())).get(0)) is an incredibly convoluted way to read a number from a file, and to take the abstruseness a bit further the fraction of a difference is multiplied by −1 instead of exchanging the subtrahend and the minuend.
With the constant 125000 the expression computes the current_mbps if current_total_bytes has been fetched one eighth of a second ago (since 125000 is one eighth of a million). The (re-)initialization of current_total_bytes is missing from the code.
Here's a Python snippet for the computation of e. g. the eth0 rate:
import time
earlier_total_bytes = None
while 0 <= (current_total_bytes := int(open("/sys/class/net/eth0/statistics/rx_bytes").read())) \
and earlier_total_bytes is None: earlier_total_bytes = current_total_bytes; time.sleep(.125)
current_mbps = (current_total_bytes - earlier_total_bytes) / 125000
Of course this can be adapted for other sampling intervals, also repeated and variable.
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I am using insertion-sort to sort the k first values in my array,
First i start by sorting the k first in decreasing order, after that i check the [k+1,n] values if they are larger thatn the lowest number in k, being k-1.
the check is done with threads, where I give every thread a segment of [k+1,n], where each of them will check the values in their segment if they are larger than k-1, if yes they will set the value in the correct place.
My problem is that the parallel version is MUCH slower than if I do it in a sequence, like 100x slower, the test i gave was makin k = 100 and n = 10milion.
Anyone know if you can parallel insertion sort?
If code is needed I can post
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I am facing issues while attempting a task that involves converting 0s (avaible seat) to the letter "O" and 1s (occupied seat) to the letter "X" in 2-dimensional arrays of strings. I have three rows of varying lengths (12, 16, and 20) that are filled with 0s, but I can't seem to get the output to look like the following:
How it should print like
I have tried to understand by watching videos and reading documentation, but I am still unclear. Can someone please help?
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I am trying to code an algorithm to implement Gamma Correction but I am unable todo so with below code, because of a high power base. Wondering if anyone could fix below code to raise color values between 0,1 Thanks
The problem is in your math.
int / int will cause a truncation.
If red = 9 and you execute 9 / 255 the result is 0.
Try making all your literal values floating point
(for example 255.0 instead of 255).
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guys.....Please help!!!
This is the picture of a textbook page that I'm reading
So I'm reading this textbook which is totally horrible, they just give codes out without any explanation.....And this is my first class in Java, I've never coded in any language before......So like a textbook without explanation just totally....you know....give me a super hard time....
Back to topic, in the picture, there are 2 sets of codes, A and B.....I understand B......But I do not get why in A, it used value.length instead of inputs.length? Isn't the array name in this code is inputs??? Is there any specific reason has to use value.length instead of array name.length???
the book clearly has an error, don't worry, should be inputs instead values, I say it with confidence because no variable values was ever initiated
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I got some data.txt file with N-string. Each string consists of 6 digits separating by space. I need to read this but before I need to check data format (I mean that each line must consist only 6 and only digits).
Do I need to use regexp?
Yes, you can do it with a regex.
One way to do this is to check if for each row you read, you have digits only, and add a constraint for the number of digits. The digits part can be done pretty easily, using a "/d" while the number of characters to be used is constrained by "{desiredNumber}".
To better understand regex in Java, use this link :D
If you still cannot solve it, this is the magic line:
if (!newLine.matches("\\d{6}")) {
return false;
}