workerpool | Python multithreaded job distribution module

by shazow Python Version: Current License: MIT

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Python multithreaded job distribution module.

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Community Discussions

Trending Discussions on workerpool

panic: runtime error: invalid memory address or nil pointer dereference (time and again)

JMeter: Performance testing of two different Thread Pools and their comparison

Issues performing network I/O in a NodeJS worker thread

Use job with time and timeout

How to fix Netlify deploy issue

What happens to vertx.eventloop thread once the control passes to blockingHandler?

java.lang.IllegalAccessError: class org.slf4j.LoggerFactory tried to access private field org.slf4j.impl.StaticLoggerBinder.SINGLETON

Running same go program multiple time throws panic: send on closed channel

Are there anyways to work around errors given by ndefinedBehaviorSanitizer

Future Object with mentioned timeOut is keep increasing for the next threads(timeOut is not applying for all the threads in the ThreadPool in Java)

QUESTION

panic: runtime error: invalid memory address or nil pointer dereference (time and again)

Asked 2021-Jun-03 at 16:12

I am very new to golang and for the most part have no idea what im doing so far. I tried to run a simple find() query to get all documents from my databse and I cant seem to get it to work i keep getting this error

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ANSWER

Answered 2021-Jun-03 at 13:18

DB is nil, because var DB=database.DB runs before database.DB is initialized.

Use database.DB directly.

Source https://stackoverflow.com/questions/67822084

QUESTION

JMeter: Performance testing of two different Thread Pools and their comparison

Asked 2021-May-06 at 08:04

My question is different from this as it is too old and there may be new JMeter Plugins.
I have two Java Classes Server1 and Server2.
Server1 class extends ThreadPoolExecutor.
Server2 class extends WaterMarkExecutor
User can connect to any of these Servers through Socket and submit Runnable Objects( that calculate some Random number).These Runnable objects are send back to the client as responses. For each Runnable Object i am calculating its resonse time and the wait-time it did in the queue of thread pool. Each Server is exposing me its Pool size and throughput after every second. I want to display and compare the performance statistics of these two servers in charts.
Instead of develping my own library for this, i want to use JMeter.
I want JMeter to
1)connect to Server1
2)send Runnable objects at specific rate
3)receive executed Runnable objects back from Server1 (as responses).
4)display the response time and wait(in queue) of each received Runnable object on Charts.
5) Display throughput and pool size of Server 1 on separate charts.
6)then i want to use the same experiment(workload etc) on Server 2 and want JMeter to compare the performance of two servers.
Now my questins are
(1) Is it easy to use JMeter for this scenario? or i should switch to some testbed(or any other tool)?
(2)suggest me some useful links of JMeter that can guide me to do this.

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ANSWER

Answered 2021-May-06 at 08:04

From your problem statement - it looks like you have got a server application with which clients can interact by sending java objects using serialization binary protocol. Jmeter is generally not used for such testing as it generally caters to other well known protocols like http, jms, ftp etc. There are readily available samplers for these. However if you want to use java serilization your best bet it to perhaps use java sampler to write own request sending/response recieving code or to use a commercial plugin ( available for trial) like this.

Other alternative is to perhaps write your own test application and use statistics from there to create visualizations.

Source https://stackoverflow.com/questions/67412635

QUESTION

Issues performing network I/O in a NodeJS worker thread

Asked 2020-Nov-19 at 20:37

I have a script that will download thousands of files from a server, perform some CPU-intensive calculations on those files, and then upload the results somewhere. As an added level of complexity, I want to limit the number of concurrent connections to the server where I'm downloading the files.

To get the CPU-intensive calculations off the event thread, I leveraged workerpool by josdejong. I also figured I could take advantage of the fact that only a limited number of threads will be spun up at any given time to limit the number of concurrent connections to my server, so I tried putting the network I/O in the worker process like so (TypeScript):

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ANSWER

Answered 2020-Oct-22 at 04:30

If it is not getting to this line of code:

Source https://stackoverflow.com/questions/64474745

QUESTION

Use job with time and timeout

Asked 2020-Oct-08 at 04:36

I use the following sample code which works, now I want that each job be able to print the time it took to execute (it's better as generic that not each job will need to use the code of

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ANSWER

Answered 2020-Oct-07 at 05:46

Update

Scroll to section "This is the accepted answer" to view the accepted answer

I went ahead and wrote a little library from the code in the accepted answer...

You can find it here or the code below:

Source https://stackoverflow.com/questions/64210104

QUESTION

How to fix Netlify deploy issue

Asked 2020-Sep-21 at 15:54

I have been trying to deploy on netlify for a while now. All the suggestions here, here and here are not working. Any suggestions?

Project is using Ionic 5.x Vue 3.0.0-rc.10

Netlify error

...

ANSWER

Answered 2020-Sep-21 at 15:54

Problem was a missing .eslintrc.js file. I created with this config

Source https://stackoverflow.com/questions/63981918

QUESTION

What happens to vertx.eventloop thread once the control passes to blockingHandler?

Asked 2020-Sep-02 at 13:02

I am using vert.x as api gateway and each request has to go through multiple handlers Sample code snippet

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ANSWER

Answered 2020-Sep-02 at 13:02

What happens to event loop threads when the control passes to blockingHandler? Do they continue to accept more requests?

Yes, the event loop will offload the blocking handler part to the worker pool and handle other events.

If yes, what happens when the blocking handler execution completes?

An event with the result is added to the event loop queue.

Does this switching from eventLoop to blockingHandler (workerPool) and then back to eventLoop has any performance implications?

Switching between threads is not free but the cost should be negligible in the overall latency for such a use case (api gateway).

What is the ideal way to handle multiple handlers?

Ideally you'd avoid blocking code in your Vert.x Web handlers.

Source https://stackoverflow.com/questions/63703491

QUESTION

java.lang.IllegalAccessError: class org.slf4j.LoggerFactory tried to access private field org.slf4j.impl.StaticLoggerBinder.SINGLETON

Asked 2020-Jun-26 at 22:03

i am trying to convert MS word to PDF using documents4j. using a java program, compiling and running the code through cmd the file is being generated with no issues.

however, when i am running the same file on tomcat, i am getting the below error:

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ANSWER

Answered 2020-Jun-26 at 21:48

have placed slf4j-jdk14-1.7.28.jar instead of slf4j-log4j12-1.7.28 solved the issue

Source https://stackoverflow.com/questions/62594257

QUESTION

Running same go program multiple time throws panic: send on closed channel

Asked 2020-May-01 at 01:14

I am new to golang and trying to understand how workerpool works. Following sample program works fine if i run once and if try to run multiple times i get panic: send on closed channel error. Go version is go1.14.2

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ANSWER

Answered 2020-Apr-30 at 23:59

You have multiple goroutines closing the results channel.

Source https://stackoverflow.com/questions/61534605

QUESTION

Are there anyways to work around errors given by ndefinedBehaviorSanitizer

Asked 2020-Apr-27 at 04:39

I have the following code:

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ANSWER

Answered 2020-Apr-21 at 06:24

You're leaking worker because you used new to construct it and never use delete to destruct it. The other ASan messages are there because as part of constructing worker, its member queue is also constructed.

Source https://stackoverflow.com/questions/61337041

QUESTION

Future Object with mentioned timeOut is keep increasing for the next threads(timeOut is not applying for all the threads in the ThreadPool in Java)

Asked 2020-Mar-12 at 08:38

The Worker Thread is Defined here with heavy task of 10 Seconds in run method

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ANSWER

Answered 2020-Mar-12 at 08:38

Because you are waiting sequentially in a loop in this section:

Source https://stackoverflow.com/questions/60624940

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