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Questions tagged [plinq]

PLINQ is a parallel query execution engine for LINQ. PLINQ supports the data parallelism pattern by adding additional syntax to allow queries to be declared as running in parallel.

PLINQ is a parallel query execution engine for . PLINQ supports the data parallelism pattern by adding additional syntax to allow queries to be declared as running in parallel.

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PLINQ Performs Worse Than Usual LINQ

Amazingly, using PLINQ did not yield benefits on a small test case I created; in fact, it was even worse than usual LINQ. Here's the test code: int repeatedCount = 10000000; private void button1_Click(object sender, EventArgs e) { …
Graviton
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How to run LINQ 'let' statements in parallel?

I have code like this: var list = new List {1, 2, 3, 4, 5}; var result = from x in list.AsParallel() let a = LongRunningCalc1(x) let b = LongRunningCalc2(x) select new {a, b}; Let's say the…
Lyall
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Ordered PLINQ ForAll

The msdn documentation about order preservation in PLINQ states the following about ForAll(). Result when the source sequence is ordered: Executes nondeterministically in parallel Result when the source sequence is unordered: Executes…
Steven Jeuris
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List Contains() with PLinq?

let's say I have a big List List longList = new List(10000000) And I want to do the following query: bool found = longList.Contains(4345235234524245124L); Is there a way to use PLinq for that to let each thread search just a little…
Chris
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"using static" kills AsParallel

In the following code, if you uncomment the "using static" line, the query will not run in parallel. Why? (Visual Studio Community 2019, .Net Core 3.1 / .Net 4.8) using System; using System.Diagnostics; using System.Linq; using…
Mike Tsayper
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AsParallel () and Any()?

I've seen this code which check a condition using AsParallel() and Any() : bool IsAnyDeviceConnected() { return m_devices.Any(d => d.IsConnected); } and to make it faster : bool IsAnyDeviceConnected() { return m_devices.AsParallel().Any(d…
Royi Namir
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Using AsSequential in order to preserve order

I am looking at this code var numbers = Enumerable.Range(0, 20); var parallelResult = numbers.AsParallel().AsOrdered() .Where(i => i % 2 == 0).AsSequential(); foreach (int i in parallelResult.Take(5)) Console.WriteLine(i); The…
MaPi
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.NET 4 Parallel.ForEach and PLINQ: can they overwhelm the thread pool and kill the app performance?

The more I use Parallel.ForEach and PLINQ in my code, the more faces and code review push backs I am getting. So I wonder is there any reason for me NOT to use PLINQ, at extreme, on each LINQ statement? Can the runtime not be smart enough to start…
Schultz9999
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Difference linq and plinq

What is the difference between these two? What is the best way to compare ? It is always better plinq ? When we use plinq ?
full Surnamestack
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Using Parallel Linq Extensions to union two sequences, how can one yield the fastest results first?

Let's say I have two sequences returning integers 1 to 5. The first returns 1, 2 and 3 very fast, but 4 and 5 take 200ms each. public static IEnumerable FastFirst() { for (int i = 1; i < 6; i++) { if (i > 3) Thread.Sleep(200); …
Alex Norcliffe
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Explain please AsParallel()

Can somebody explain me one thing. As I understand AsParallel() executes in own task. So, if query return huge amount of data the variable 'd' can be empty at time when 'foreach' started to execute Console.WriteLine? var integerList =…
user628147
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When should I use AsParallel() in linq/plinq

I'm looking make use of the advantages of parallel programming in linq by using plinq, im not sure I understand the use entirely apart from the fact its going to make use of all cpu cores more efficiently so for a large query it might be quicker.…
Froggy
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Combining PLINQ with Async method

I'm trying to combine my PLINQ statement like this: Enumerable.Range(0, _sortedList.Count()).AsParallel().WithDegreeOfParallelism(10) .Select(i => GetTransactionDetails(_sortedList[i].TransactionID)) .ToList(); With an async…
User987
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Has got any real benefit of PLINQ?

Recently I made a couple of measures about Linq and Plinq. I can't see in which situation has a real significant benefit of Plinq. I've found many examples such as: Enumerable.Range(0, 10000).AsParallel().ForAll(_ => Thread.Sleep(50000)); This is…
speti43
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How can I prevent AppDomainUnloadedException after NUnit tests PLINQ code?

How can I diagnose and minimize or prevent AppDomainUnloadedException? NUnit 2.5.2 consistently throws AppDomainUnloadedException after long (>10s) tests involving PLINQ. Back in July 2008, Stephen Toub said: Yes, the scheduler in the CTP…
Garth Kidd
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