ncp | Simple utility to pipe data | TCP library
kandi X-RAY | ncp Summary
kandi X-RAY | ncp Summary
I wrote this utility to try and take advantage of bonded interfaces when sending large data streams between hosts in my computer lab. The idea is to split the data stream so that it can be transmitted on multiple interfaces simultaneously and then reassembled at the other end. This implementation relies on L3+4 transmit hashing by creating a number of connections on different ports. A connection is established on a single, known port and then sockets for the streams are established by the server and the port numbers transmitted to the client to complete the connections.
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ncp Key Features
ncp Examples and Code Snippets
Lines of Code : 5
License : No License
Copy/* receive */
ncp recv [port] > out
/* transmit */
ncp send [host] [port] < in
gcc -o ncp *c lib/cobs/cobs.c -lpthread
Community Discussions
Trending Discussions on ncp
QUESTION
I have a cluster of Artemis in Kubernetes with 3 group of master/slave:
...ANSWER
Answered 2021-Jun-02 at 01:56I've taken your simplified configured with just 2 nodes using a non-wildcard queue with redistribution-delay of 0, and I reproduced the behavior you're seeing on my local machine (i.e. without Kubernetes). I believe I see why the behavior is such, but in order to understand the current behavior you first must understand how redistribution works in the first place.
In a cluster every time a consumer is created the node on which the consumer is created notifies every other node in the cluster about the consumer. If other nodes in the cluster have messages in their corresponding queue but don't have any consumers then those other nodes redistribute their messages to the node with the consumer (assuming the message-load-balancing is ON_DEMAND and the redistribution-delay is >= 0).
In your case however, the node with the messages is actually down when the consumer is created on the other node so it never actually receives the notification about the consumer. Therefore, once that node restarts it doesn't know about the other consumer and does not redistribute its messages.
I see you've opened ARTEMIS-3321 to enhance the broker to deal with this situation. However, that will take time to develop and release (assuming the change is approved). My recommendation to you in the mean-time would be to configure your client reconnection which is discussed in the documentation, e.g.:
QUESTION
I have worked with github actions before while setting up github-workflow, but this is the first time I'm including action/job for npm test.
I have configured it to run the actions on pull request to develop branch as usual... but the tests never finish running in the github action jobs. I've been googling but can't seem to find a relevant solution.
Github pull-request screenshot 1
Github pull-request screenshot 2
I'm using nodejs and the test is written with jasmine. I don't know if it has anything to do with my settings or test configuration which I set up myself, so I've also included some relevant code/files below just in case.
.github/workflows/node.js.yml
...ANSWER
Answered 2021-Mar-04 at 20:46While I've not had the chance to look at your GitHub repo, from what you've posted here, one solution I'll propose is to:
- have dev-test as part of your script that will run
nodemon --exec babel-node spec/run.jsin your package.json configuration - change the test script of your package.json to
babel-node spec/run.js.
This will ensure that the tests will be run only once when a change is pushed. SO, when working locally, you can use npm run dev-test to keep the test on for the entire period you are making changes locally.
QUESTION
I'm using ncp to copy files as following:
ANSWER
Answered 2021-Feb-21 at 19:59I guess you are trying to copy all files matching for the given glob, so you need to do:
QUESTION
I am currently trying to count the number of NAs found in each of my dataset's columns.
I am running the following code:
...ANSWER
Answered 2021-Feb-19 at 21:59Try using sapply, this is the one-liner I use, with df as your dataframe.
QUESTION
I have the following code:
...ANSWER
Answered 2021-Jan-30 at 11:22I've added this else statement to satisfies the case when (jsonData = new JSONObject(getJSONString(request))) is null.
The new JSONObject(getJSONString(request))) will never be null. As one can conclude by reading JLS section 15.9.4:
The value of a class instance creation expression is a reference to the newly created object of the specified class. Every time the expression is evaluated, a fresh object is created.
This statement
(jsonData = new JSONObject(getJSONString(request))) != null)
will either evaluate to true or throw an Exception.
If it evaluate to true then one of the following branches will be executed:
QUESTION
In the following code, my 1st table rows are not stretching to full which is frustrating. While 2nd table is fine and stretches as expected. Can someone cite me the reason and help fix it?
...ANSWER
Answered 2020-Nov-22 at 02:31Remove display: inline-block; in table should solve the issue.
QUESTION
i am working on some performance testing task. The main goal is to compare duration of old NCP protocol calls againts new REST API calls. I have this scenario:
- Client has an authenticated session
- Client access protected resource
I have to create two variants:
a) One-by-one variant: The question is: How long does it take to perform 2000 requests sent one by one?
b) Concurrent variant: The question is: How long does it take to perform 2000 Request which are sent concurrently (300 Threads ideal)
I dont know the best way to solve this problem. My idea is:
a) Creation of 2000 Http clients -> Each client sends HTTP Post with credentials in body -> Each client sends HTTP GET and get the response (I will measure the time between sending the GET request and getting a response for each iteration and Sum it.
b) Creation of 2000 Httpclients -> Use executor service with fixed thread pool (300) -> each thread will perform sending get request.
Is there any other way? I know that Jmeter is a great tool but i am not sure that this scenario could by performed on Jmeter. Thanks!
...ANSWER
Answered 2020-Nov-13 at 15:36JUnit itself doesn't provide any multithreading logic, you will have to construct the HTTP requests yourself (or with a 3rd-party library like RestAssured) and then execute them using i.e. ExecutorService or jmh and then come up with something for results analysis.
JMeter has everything out of the box so you won't need to write a single line of code, reporting is also included, it might be not that CI friendly as JMeter .jmx scripts are XML but on the other hand you will get nice protocol metrics and ability to correlate increasing load with increasing response time
QUESTION
I have a mapply function that runs a sum expression so that each row the sum starts from the same number. ie row 1: sum starting from row 1, row 2: sum starting from row 2 etc. This works fine, however I now need to be able to run it on grouped data and I'm having some trouble getting this to run. I believe pmap is the analogue of mapply within dplyr so I'm trying to use this with grouped data.
The data looks something like:
...ANSWER
Answered 2020-Oct-12 at 09:21Just translating your attempt using pmap_dbl :
QUESTION
I'm trying to populate a column with the sum of an expression that has fixed cells, but as the expression moves down the columns the fixed cells for the sum changes, as do the number of rows that need to be included. I thought I could achieve it with lead & lag functions, but no.
I hope its possible, I could write out each expression for each bin and then create a column out of the values then, but this will be part of a function that different sized datasets get fed through, so I kind of need it to be automated until the end of the time_bin.
The output column in the data is what I'm hoping for.
...ANSWER
Answered 2020-Oct-08 at 14:17Try this:
QUESTION
I would like to use R to randomly construct chi-square distribution with the degree of freedom of 5 with 100 observations. After doing so, I want to calculate the mean of those observations and use ggplot2 to plot the chi-square distribution with a bar chart. The following is my code:
...ANSWER
Answered 2020-Oct-06 at 03:07The problem is that inside the ggplot function you are calling the same dataframe (x_100) as both the data and the x variable inside aes. Remember that in ggplot, inside aes you should indicate the name of the column you wish to map. Additionally, if you want to plot the chi-square distribution I think it might be a better idea to use the geom_histogram instead of geom_bar, as the first one groups the observations into bins.
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