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Parallel Library: does a delay on one degree of parallelism delay all of them?


Parallel Library: does a delay on one degree of parallelism delay all of them?

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Parallel Library: does a delay on one degree of parallelism delay all of them?
Tag : chash , By : nickthecook
Date : November 24 2020, 05:44 AM


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scala parallel collections degree of parallelism


Tag : scala , By : Guid
Date : March 29 2020, 07:55 AM
it should still fix some issue Is there any equivalent in scala parallel collections to LINQ's withDegreeOfParallelism which sets the number of threads which will run a query? I want to run an operation in parallel which needs to have a set number of threads running. , With the newest trunk, using the JVM 1.6 or newer, use the:
collection.parallel.ForkJoinTasks.defaultForkJoinPool.setParallelism(parlevel: Int)
scala> import scala.collection.parallel._
import scala.collection.parallel._

scala> val pc = mutable.ParArray(1, 2, 3)
pc: scala.collection.parallel.mutable.ParArray[Int] = ParArray(1, 2, 3)

scala> pc.tasksupport = new ForkJoinTaskSupport(new scala.concurrent.forkjoin.ForkJoinPool(2))
pc.tasksupport: scala.collection.parallel.TaskSupport = scala.collection.parallel.ForkJoinTaskSupport@4a5d484a

scala> pc map { _ + 1 }
res0: scala.collection.parallel.mutable.ParArray[Int] = ParArray(2, 3, 4)

How to get maximum degree of parallelism for task parallel library usage?


Tag : chash , By : user123284
Date : March 29 2020, 07:55 AM
will help you Parallel tasks are basically threads that can be shared. Because the number of active threads is limited by the number of logical processor cores that are available, a good guess would be to just take the number of logical cores available to the program.
Environment.ProcessorCount

How to use task parallel library (TPL) with load balancing and limited degree of parallelism?


Tag : chash , By : Rit Li
Date : March 29 2020, 07:55 AM
Does that help You should use TPL Dataflow's ActionBlock that encapsulates all that for you. It's an actor based framework that is part of the TPL:
var block = new ActionBlock<Value>(
    value => GetWriteValueTask(value, priority)
    new ExecutionDataflowBlockOptions()
    {
        MaxDegreeOfParallelism = GetMaxNrParallelWrites();
    });

foreach (var value in values)
{
    block.Post(value);
}

Not getting the right degree of parallelism for http queries when using Parallel.foreach


Tag : chash , By : Zinovate
Date : March 29 2020, 07:55 AM
this will help I am trying to perform 2000 http queries at the same time. Tests conducted with this code (consisting mostly of responding servers) run in about 15 seconds : ,
-Why do I have such a difference in performance ?
public async Task TestTasksProperly()
{
    var urls = new List<string>();
    urls.AddRange(createUrls());

    var stopwatch = Stopwatch.StartNew();
    ConcurrentQueue<string> contents = new ConcurrentQueue<string>();
    await Task.WhenAll(urls.Select(url => QueryUrl(url, contents)))).ConfigureAwait(false);

    var time = stopwatch.ElapsedMilliseconds / 1000.0;
    Console.WriteLine("Time spent in Tasks : " + time);
    Console.WriteLine("Queue size : " + contents.Count);
}

private static async Task QueryUrl(string url, ConcurrentQueue<string> contents)
{
    using (var client = new HttpClient {Timeout = TimeSpan.FromSeconds(10)})
    {
        using (var response = await client.GetAsync(url).ConfigureAwait(false))
        {
            try
            {
                var content = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
                contents.Enqueue(content);
            }
            catch (Exception e)
            {
            }
        }
    }
}

Abort | remove delay() function if video is pauzed (do not delay anymore even if delay is not finished)


Tag : jquery , By : keird
Date : March 29 2020, 07:55 AM
around this issue I make subtitles system for my video. Right now I am at the stage where subtitle - a box with a text should be shown on spesific second and on spesific position and then after x seconds fade out. However I am stuck at this: if I pauze a video when subtitle is still shown - I want it to remain shown but it runs out of that x seconds and hides anyways. , This should work:
$('.sub').stop(true)
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