Are parallel and forkjoinpool flows safe to use in production?

We developed an API call which uses Java8 parallel streams and we have got very good performance, almost double compared to sequential processing when doing stress tests. I know it depends on the use case, but I am using it for crypto operations, so

How to wait while parallelStreams is running?

So, let's deal now. I have Parser class where I can get links from html. I've used Jsoup to get links and then I want to add this links to List. I'm using StreamAPI to proceed that. Look at the following code fragment: public static List<Link> getLi

Quick queue for reading numpy tables only

I have a multiprocessing job where I'm queuing read only numpy arrays, as part of a producer consumer pipeline. Currently they're being pickled, because this is the default behaviour of multiprocessing.Queue which slows down performance. Is there any

Synchronous parallel process in C # / C ++

I have an array x[] containing data. Also there is an array of "system states" c[]. The process: for(i = 1; i < N; i++) { a = f1(x[i] + c[i-1]); b = f2(x[i] + c[i-1]); c[i] = a + b; } Is there any efficient way to find the values of f1 and f2

Collection of parallel aggregates

I have seen code for parallel aggregation for basic types, e.g. Parallel.For<int>(0, result.Count, () => 0, (i, loop, subtotal) => { subtotal += result[i]; return subtotal; }, (x) => Interlocked.Add(ref sum, x) ); I was wondering if there w

parallelize for-loop containing if-statement

I have to traverse a 2D-array and perform some operations on them, depending on the results of an if-statement. I have made a small example of the loop here: N=128; A = rand(N,N); B = rand(N,N); sqr = @(x) x.^2; for xi=1:N for yi=1:N a = A(xi,yi); b

Execution time for each package

This question already has an answer here: Why is the parallel package slower than just using apply? 3 answers I have problem by using foreach package in R. In fact, when I compile this code : tmp=proc.time() x<-for(i in 1:1000){sqrt(i)} x proc.time()

Why parallel code is slower?

This question already has an answer here: Parallel.ForEach Slower than ForEach 4 answers I created a simple test with big arrays, and I get a big difference between parallel for and normal for using System; using System.Collections.Generic; using Sys

Parallel programming in C without thread or high-level library

I'm playing a bit with parallel programming in C; Hence whatever solution I see in the articles I'm reading are built on top of Threads or stuff like OpenMP, MPI, Select on Windows or Fork on *nix; I got the following questions: Can a single process

Multi-dimensional array run performance CLR

In a great many places in the software I write, there are three-dimensioned arrays of short or float, usually with several million elements. The data is best understood conceptually as a three-dimensioned array, since it describes values at regular l

Does Parallel cause a crash?

I'm new to C#, but learning it. I figured out C# has many awesome methods such as Parallel. So let's say my program has this method. private void stackOverFlowExample() { List<string> testCompany = new List<string>(); List<People> testLi

Parallel and end execution of multiple threads

I have a simple application in which I create 3 threads inside a class to ping 3 different websites and note the time taken to do so. I wish to enhance it by seeing which thread out of the 3 executes successfully first and terminating the other two .

Parallel Gnu to copy a large amount of data (about 40 GB)

My requirement is simple but unable to find a way to do it effectively. I have a directory named Code which contains around 14lac files and is around 40 GB. All i want to do is to create a copy of this Code folder at same directory level. Means Code

Multiprocessing = several processes in progress?

I'm somewhat confused about multiprocessing. I'm a 3 years Python programmer, however never really needed to perform tasks in parallel (not just asynchronously). But what I know, or thought to know, is that when using the multiprocessing module in Py

data.table and parallel computing

Following this post: multicore and data.table in R, I was wondering if there was a way to use all cores when using data.table, typically doing calculations by groups could be parallelized. It seems that plyr allows such operations by design.First thi

from the 2bit branch predictor to the 8-bit predictor

I got an project to convert 2-bit branch predictor in 'SimpleScalar' to 8-bit branch predictor. Which means I need to change the source code of 2-bit predicor from 'SimpleScalar' and make it work like a 8-bit predictor. I know how predictors work but

Problems using batch with matlabpool

I want to use some parallel features in Matlab. And execute following command. matlabpool open local 12; batch(funcname,1,{arg},'PathDependencies',p,'Matlabpool',1); Then all processes keep silent for the rest of time... But without opening matlabpoo

Task.WaitAll and exceptions

I have a problem with exception handling and parallel tasks. The code shown below starts 2 tasks and waits for them to finish. My problem is, that in case a task throws an exception, the catch handler is never reached. List<Task> tasks = new List<

.NET Parallel.ForEach, StreamWriter output + secure thread

In the past I have used ThreadPool.QueueUserWorkItem to spawn multiple threads from a manager class. This manager class subscribes to an event in these spawned threads which is raised when the thread work completes. The manager class can then handle

Pass values ​​with parallel extensions and VB.net

I am looking for an example of how to do the following in VB.net with Parallel Extensions. Dim T As Thread = New Thread(AddressOf functiontodowork) T1.Start(InputValueforWork) Where I'm getting stuck is on how to pass into the task my parameter Input

What is the best way to run parallel tasks in Ksh and Perl?

I have this large C++ project that I need to build on a platform that does not have a parallel make (like make -j on Linux). The server has 6 CPU's and I want to do a parallel build manually. I can generate a task list like this for about 300 object