Clarification on running multiple async tasks in parallel with throttling and polly policies ...
Deal with toxic manager when you can't quit
Is "plugging out" electronic devices an American expression?
Aging parents with no investments
What is the motivation for a law requiring 2 parties to consent for recording a conversation
Apparent duplicates between Haynes service instructions and MOT
How to save as into a customized destination on macOS?
Why can Shazam fly?
Is three citations per paragraph excessive for undergraduate research paper?
Pokemon Turn Based battle (Python)
Why do some words that are not inflected have an umlaut?
Is flight data recorder erased after every flight?
Why hard-Brexiteers don't insist on a hard border to prevent illegal immigration after Brexit?
Is an up-to-date browser secure on an out-of-date OS?
Why did Acorn's A3000 have red function keys?
Can one be advised by a professor who is very far away?
Reference request: Oldest number theory books with (unsolved) exercises?
Loose spokes after only a few rides
If I score a critical hit on an 18 or higher, what are my chances of getting a critical hit if I roll 3d20?
What tool would a Roman-age civilization have for the breaking of silver and other metals into dust?
How to answer pointed "are you quitting" questioning when I don't want them to suspect
How to deal with fear of taking dependencies
How to type this arrow in math mode?
Did Scotland spend $250,000 for the slogan "Welcome to Scotland"?
Can a flute soloist sit?
Clarification on running multiple async tasks in parallel with throttling and polly policies
The 2019 Stack Overflow Developer Survey Results Are InCorrect approach to wait for multiple async methods to completeAsync method with multiple tasksRunning tasks in parallelParallel process interest in C#WPF async ObservableTaskQueue classTask-Based Multithreading Library - Implemented using FibersA new approach to multithreading in ExcelMinimalist dynamic task schedulerRunning parallel tasks until they're doneCustom TaskScheduler: Limited concurrency level
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}
$begingroup$
I'm trying to run multiple async Tasks in parallel with throttling using polly AsyncBulkheadPolicy + WaitAndRetryPolicy. My understanding so far is that the policy method ExecuteAsync does not itself make a call onto a thread, but is leaving that to the default Task Scheduler or someone before it. Thus, if my tasks are CPU bound in some way then I need to use Parallel.ForEach when executing tasks or Task.Run() with the ExecuteAsync method in order to schedule the tasks to background threads.
Can someone look at the examples below and clarify how they would work in terms of parallism and threadpooling? What they would suggest?
https://github.com/App-vNext/Polly/wiki/Bulkhead - Operation: The policy itself does not place calls onto threads; it assumes upstream systems have already placed calls into threads, but limits their parallelization of execution.
async Task DoSomething(IEnumerable<object> objects);
//Example 1:
//Simple use, but then I don't have access to retry policies from polly
Parallel.ForEach(groupedObjects, (set) =>
{
var task = DoSomething(set);
task.Wait();
});
//Example 2:
//Uses default TaskScheduler which may or may not run the tasks in parallel
var parallelTasks = new List<Task>();
foreach (var set in groupedObjects)
{
var task = bulkheadPolicy.ExecuteAsync(async () => DoSomething(set));
parallelTasks.Add(task);
};
await Task.WhenAll(parallelTasks);
//Example 3:
//seems to defeat the purpose of the bulkhead since Parallel.ForEach and
//PolicyBulkheadAsync can both do throttling...just use basic RetryPolicy
//here?
Parallel.ForEach(groupedObjects, (set) =>
{
var task = policy.ExecuteAsync(async () => DoSomething(set));
task.Wait();
});
//Example 4:
//Task.Run still uses the default Task Scheduler and isn't any different than
//Example 2; just makes more tasks (wrapping the async tasks)
var parallelTasks = new List<Task>();
foreach (var set in groupedObjects)
{
var task = Task.Run(async () => await bulkheadPolicy.ExecuteAsync(async () => DoSomething(set)));
parallelTasks.Add(task);
};
await Task.WhenAll(parallelTasks);
DoSomething is an async method doing operations on a set of objects, it's both I/O and CPU bound. I'd like this to happen in parallel threads while respecting retry policies from polly and allowing for throttling.
I seem to have confused myself along the way in what exactly the functional behavior of Parallel.ForEach and using Bulkhead.ExecuteAsync does, however, when it comes to how tasks/threads are handled.
I'm leaning towards example 3 or a tweaked 4 (Task.Run + ConfigureAwait(false) should net me different threadpool threads, yes?)
c# performance multithreading asynchronous task-parallel-library
asked 9 mins ago
Jonathan AllbrittenJonathan Allbritten
1
New contributor
Jonathan Allbritten is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
I'm trying to run multiple async Tasks in parallel with throttling using polly AsyncBulkheadPolicy + WaitAndRetryPolicy. My understanding so far is that the policy method ExecuteAsync does not itself make a call onto a thread, but is leaving that to the default Task Scheduler or someone before it. Thus, if my tasks are CPU bound in some way then I need to use Parallel.ForEach when executing tasks or Task.Run() with the ExecuteAsync method in order to schedule the tasks to background threads.
Can someone look at the examples below and clarify how they would work in terms of parallism and threadpooling? What they would suggest?
https://github.com/App-vNext/Polly/wiki/Bulkhead - Operation: The policy itself does not place calls onto threads; it assumes upstream systems have already placed calls into threads, but limits their parallelization of execution.
async Task DoSomething(IEnumerable<object> objects);
//Example 1:
//Simple use, but then I don't have access to retry policies from polly
Parallel.ForEach(groupedObjects, (set) =>
{
var task = DoSomething(set);
task.Wait();
});
//Example 2:
//Uses default TaskScheduler which may or may not run the tasks in parallel
var parallelTasks = new List<Task>();
foreach (var set in groupedObjects)
{
var task = bulkheadPolicy.ExecuteAsync(async () => DoSomething(set));
parallelTasks.Add(task);
};
await Task.WhenAll(parallelTasks);
//Example 3:
//seems to defeat the purpose of the bulkhead since Parallel.ForEach and
//PolicyBulkheadAsync can both do throttling...just use basic RetryPolicy
//here?
Parallel.ForEach(groupedObjects, (set) =>
{
var task = policy.ExecuteAsync(async () => DoSomething(set));
task.Wait();
});
//Example 4:
//Task.Run still uses the default Task Scheduler and isn't any different than
//Example 2; just makes more tasks (wrapping the async tasks)
var parallelTasks = new List<Task>();
foreach (var set in groupedObjects)
{
var task = Task.Run(async () => await bulkheadPolicy.ExecuteAsync(async () => DoSomething(set)));
parallelTasks.Add(task);
};
await Task.WhenAll(parallelTasks);
DoSomething is an async method doing operations on a set of objects, it's both I/O and CPU bound. I'd like this to happen in parallel threads while respecting retry policies from polly and allowing for throttling.
I seem to have confused myself along the way in what exactly the functional behavior of Parallel.ForEach and using Bulkhead.ExecuteAsync does, however, when it comes to how tasks/threads are handled.
I'm leaning towards example 3 or a tweaked 4 (Task.Run + ConfigureAwait(false) should net me different threadpool threads, yes?)
c# performance multithreading asynchronous task-parallel-library
asked 9 mins ago
Jonathan AllbrittenJonathan Allbritten
1
New contributor
Jonathan Allbritten is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
I'm trying to run multiple async Tasks in parallel with throttling using polly AsyncBulkheadPolicy + WaitAndRetryPolicy. My understanding so far is that the policy method ExecuteAsync does not itself make a call onto a thread, but is leaving that to the default Task Scheduler or someone before it. Thus, if my tasks are CPU bound in some way then I need to use Parallel.ForEach when executing tasks or Task.Run() with the ExecuteAsync method in order to schedule the tasks to background threads.
Can someone look at the examples below and clarify how they would work in terms of parallism and threadpooling? What they would suggest?
https://github.com/App-vNext/Polly/wiki/Bulkhead - Operation: The policy itself does not place calls onto threads; it assumes upstream systems have already placed calls into threads, but limits their parallelization of execution.
async Task DoSomething(IEnumerable<object> objects);
//Example 1:
//Simple use, but then I don't have access to retry policies from polly
Parallel.ForEach(groupedObjects, (set) =>
{
var task = DoSomething(set);
task.Wait();
});
//Example 2:
//Uses default TaskScheduler which may or may not run the tasks in parallel
var parallelTasks = new List<Task>();
foreach (var set in groupedObjects)
{
var task = bulkheadPolicy.ExecuteAsync(async () => DoSomething(set));
parallelTasks.Add(task);
};
await Task.WhenAll(parallelTasks);
//Example 3:
//seems to defeat the purpose of the bulkhead since Parallel.ForEach and
//PolicyBulkheadAsync can both do throttling...just use basic RetryPolicy
//here?
Parallel.ForEach(groupedObjects, (set) =>
{
var task = policy.ExecuteAsync(async () => DoSomething(set));
task.Wait();
});
//Example 4:
//Task.Run still uses the default Task Scheduler and isn't any different than
//Example 2; just makes more tasks (wrapping the async tasks)
var parallelTasks = new List<Task>();
foreach (var set in groupedObjects)
{
var task = Task.Run(async () => await bulkheadPolicy.ExecuteAsync(async () => DoSomething(set)));
parallelTasks.Add(task);
};
await Task.WhenAll(parallelTasks);
DoSomething is an async method doing operations on a set of objects, it's both I/O and CPU bound. I'd like this to happen in parallel threads while respecting retry policies from polly and allowing for throttling.
I seem to have confused myself along the way in what exactly the functional behavior of Parallel.ForEach and using Bulkhead.ExecuteAsync does, however, when it comes to how tasks/threads are handled.
I'm leaning towards example 3 or a tweaked 4 (Task.Run + ConfigureAwait(false) should net me different threadpool threads, yes?)
c# performance multithreading asynchronous task-parallel-library
asked 9 mins ago
Jonathan AllbrittenJonathan Allbritten
1
New contributor
Jonathan Allbritten is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I'm trying to run multiple async Tasks in parallel with throttling using polly AsyncBulkheadPolicy + WaitAndRetryPolicy. My understanding so far is that the policy method ExecuteAsync does not itself make a call onto a thread, but is leaving that to the default Task Scheduler or someone before it. Thus, if my tasks are CPU bound in some way then I need to use Parallel.ForEach when executing tasks or Task.Run() with the ExecuteAsync method in order to schedule the tasks to background threads.
Can someone look at the examples below and clarify how they would work in terms of parallism and threadpooling? What they would suggest?
https://github.com/App-vNext/Polly/wiki/Bulkhead - Operation: The policy itself does not place calls onto threads; it assumes upstream systems have already placed calls into threads, but limits their parallelization of execution.
async Task DoSomething(IEnumerable<object> objects);
//Example 1:
//Simple use, but then I don't have access to retry policies from polly
Parallel.ForEach(groupedObjects, (set) =>
{
var task = DoSomething(set);
task.Wait();
});
//Example 2:
//Uses default TaskScheduler which may or may not run the tasks in parallel
var parallelTasks = new List<Task>();
foreach (var set in groupedObjects)
{
var task = bulkheadPolicy.ExecuteAsync(async () => DoSomething(set));
parallelTasks.Add(task);
};
await Task.WhenAll(parallelTasks);
//Example 3:
//seems to defeat the purpose of the bulkhead since Parallel.ForEach and
//PolicyBulkheadAsync can both do throttling...just use basic RetryPolicy
//here?
Parallel.ForEach(groupedObjects, (set) =>
{
var task = policy.ExecuteAsync(async () => DoSomething(set));
task.Wait();
});
//Example 4:
//Task.Run still uses the default Task Scheduler and isn't any different than
//Example 2; just makes more tasks (wrapping the async tasks)
var parallelTasks = new List<Task>();
foreach (var set in groupedObjects)
{
var task = Task.Run(async () => await bulkheadPolicy.ExecuteAsync(async () => DoSomething(set)));
parallelTasks.Add(task);
};
await Task.WhenAll(parallelTasks);
DoSomething is an async method doing operations on a set of objects, it's both I/O and CPU bound. I'd like this to happen in parallel threads while respecting retry policies from polly and allowing for throttling.
I seem to have confused myself along the way in what exactly the functional behavior of Parallel.ForEach and using Bulkhead.ExecuteAsync does, however, when it comes to how tasks/threads are handled.
I'm leaning towards example 3 or a tweaked 4 (Task.Run + ConfigureAwait(false) should net me different threadpool threads, yes?)
c# performance multithreading asynchronous task-parallel-library
c# performance multithreading asynchronous task-parallel-library
asked 9 mins ago
Jonathan AllbrittenJonathan Allbritten
1
New contributor
Jonathan Allbritten is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 9 mins ago
Jonathan AllbrittenJonathan Allbritten
1
New contributor
Jonathan Allbritten is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 9 mins ago
Jonathan AllbrittenJonathan Allbritten
1
New contributor
Jonathan Allbritten is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 9 mins ago
Jonathan AllbrittenJonathan Allbritten
1
asked 9 mins ago
Jonathan AllbrittenJonathan Allbritten
1
1
New contributor
Jonathan Allbritten is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Jonathan Allbritten is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Jonathan Allbritten is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
add a comment |
0
active
oldest
votes
Your Answer
StackExchange.ifUsing("editor", function () {
return StackExchange.using("mathjaxEditing", function () {
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix) {
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["\$", "\$"]]);
});
});
}, "mathjax-editing");
StackExchange.ifUsing("editor", function () {
StackExchange.using("externalEditor", function () {
StackExchange.using("snippets", function () {
StackExchange.snippets.init();
});
});
}, "code-snippets");
StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "196"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});
function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});
}
});
Jonathan Allbritten is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fcodereview.stackexchange.com%2fquestions%2f217241%2fclarification-on-running-multiple-async-tasks-in-parallel-with-throttling-and-po%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
0
active
oldest
votes
0
active
oldest
votes
active
oldest
votes
active
oldest
votes
Jonathan Allbritten is a new contributor. Be nice, and check out our Code of Conduct.
Jonathan Allbritten is a new contributor. Be nice, and check out our Code of Conduct.
Jonathan Allbritten is a new contributor. Be nice, and check out our Code of Conduct.
Jonathan Allbritten is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Code Review Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fcodereview.stackexchange.com%2fquestions%2f217241%2fclarification-on-running-multiple-async-tasks-in-parallel-with-throttling-and-po%23new-answer', 'question_page');
}
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
