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Tracking issue for threading work items #52701

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area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
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@kouvel
kouvel
opened on May 13, 2021
  • Using less power when appropriate on machines with heterogenous cores
    • The thread pool parallelizes fairly quickly and likely causes cores to be unparked or for threads to be switched to a performance core. The goal is to experiment with a couple of ideas that may work and to measure the effects.
    • Identify a mobile device scenario to improve and measure the current performance and power
    • Experiment with using the online core count to limit concurrency while still being able to unpark cores if necessary for performance
    • Experiment with spin-waiting less and measure power usage
  • Further investigate the perf regressions from processing IO events at higher priority on Unixes. Tracking issue for some thread pool experiments (.NET 8) #77665
  • Hill climbing
    • Disable hill climbing by default for a few previews and gather feedback
    • Consider an alternative, to identify individual threads that appear to be stalled and responding more quickly similarly to cooperative blocking
  • The overhead of work stealing is high, especially in bursty scenarios or in cases where the thread count is high, when threads are all trying to determine that there is no work left. Reduce time in .NET Threadpool's WorkStealingQueue.TrySteal method and ThreadPoolWorkQueue.Dequeue methods.  #10752

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    , 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
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(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
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btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
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codeBlock.parentElement.style.position = 'relative';
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});
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addCopyButtons();
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var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
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(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
Tracking issue for threading work items · Issue #52701 · dotnet/runtime · GitHub
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    Tracking issue for threading work items #52701
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    Tracking issue for threading work items#52701
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    area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
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    @kouvel
    kouvel
    opened on May 13, 2021
    •  Using less power when appropriate on machines with heterogenous cores

      • The thread pool parallelizes fairly quickly and likely causes cores to be unparked or for threads to be switched to a performance core. The goal is to experiment with a couple of ideas that may work and to measure the effects.
      •  Identify a mobile device scenario to improve and measure the current performance and power
      •  Experiment with using the online core count to limit concurrency while still being able to unpark cores if necessary for performance
      •  Experiment with spin-waiting less and measure power usage
    •  Further investigate the perf regressions from processing IO events at higher priority on Unixes. Tracking issue for some thread pool experiments (.NET 8) #77665
    •  Hill climbing

      •  Disable hill climbing by default for a few previews and gather feedback
      •  Consider an alternative, to identify individual threads that appear to be stalled and responding more quickly similarly to cooperative blocking
    •  The overhead of work stealing is high, especially in bursty scenarios or in cases where the thread count is high, when threads are all trying to determine that there is no work left. Reduce time in .NET Threadpool's WorkStealingQueue.TrySteal method and ThreadPoolWorkQueue.Dequeue methods.  #10752
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Tracking issue for threading work items · Issue #52701 · dotnet/runtime · GitHub
      Skip to content
      Tracking issue for threading work items #52701
      Open
      Open
      Tracking issue for threading work items#52701
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      Labels
      area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
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      Description
      @kouvel
      kouvel
      opened on May 13, 2021
      •  Using less power when appropriate on machines with heterogenous cores

        • The thread pool parallelizes fairly quickly and likely causes cores to be unparked or for threads to be switched to a performance core. The goal is to experiment with a couple of ideas that may work and to measure the effects.
        •  Identify a mobile device scenario to improve and measure the current performance and power
        •  Experiment with using the online core count to limit concurrency while still being able to unpark cores if necessary for performance
        •  Experiment with spin-waiting less and measure power usage
      •  Further investigate the perf regressions from processing IO events at higher priority on Unixes. Tracking issue for some thread pool experiments (.NET 8) #77665
      •  Hill climbing

        •  Disable hill climbing by default for a few previews and gather feedback
        •  Consider an alternative, to identify individual threads that appear to be stalled and responding more quickly similarly to cooperative blocking
      •  The overhead of work stealing is high, especially in bursty scenarios or in cases where the thread count is high, when threads are all trying to determine that there is no work left. Reduce time in .NET Threadpool's WorkStealingQueue.TrySteal method and ThreadPoolWorkQueue.Dequeue methods.  #10752
      Completed
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
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terms.forEach(function(term) {
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span.className = 'userscript-highlight';
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var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
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highlight(document.body);
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var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Tracking issue for threading work items · Issue #52701 · dotnet/runtime · GitHub
        Skip to content
        Tracking issue for threading work items #52701
        Open
        Open
        Tracking issue for threading work items#52701
        Assignees
        VSadov
        Labels
        area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
        Milestone
        Future
        Description
        @kouvel
        kouvel
        opened on May 13, 2021
        •  Using less power when appropriate on machines with heterogenous cores

          • The thread pool parallelizes fairly quickly and likely causes cores to be unparked or for threads to be switched to a performance core. The goal is to experiment with a couple of ideas that may work and to measure the effects.
          •  Identify a mobile device scenario to improve and measure the current performance and power
          •  Experiment with using the online core count to limit concurrency while still being able to unpark cores if necessary for performance
          •  Experiment with spin-waiting less and measure power usage
        •  Further investigate the perf regressions from processing IO events at higher priority on Unixes. Tracking issue for some thread pool experiments (.NET 8) #77665
        •  Hill climbing

          •  Disable hill climbing by default for a few previews and gather feedback
          •  Consider an alternative, to identify individual threads that appear to be stalled and responding more quickly similarly to cooperative blocking
        •  The overhead of work stealing is high, especially in bursty scenarios or in cases where the thread count is high, when threads are all trying to determine that there is no work left. Reduce time in .NET Threadpool's WorkStealingQueue.TrySteal method and ThreadPoolWorkQueue.Dequeue methods.  #10752
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
Tracking issue for threading work items · Issue #52701 · dotnet/runtime · GitHub
          Skip to content
          Tracking issue for threading work items #52701
          Open
          Open
          Tracking issue for threading work items#52701
          Assignees
          VSadov
          Labels
          area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
          Milestone
          Future
          Description
          @kouvel
          kouvel
          opened on May 13, 2021
          •  Using less power when appropriate on machines with heterogenous cores

            • The thread pool parallelizes fairly quickly and likely causes cores to be unparked or for threads to be switched to a performance core. The goal is to experiment with a couple of ideas that may work and to measure the effects.
            •  Identify a mobile device scenario to improve and measure the current performance and power
            •  Experiment with using the online core count to limit concurrency while still being able to unpark cores if necessary for performance
            •  Experiment with spin-waiting less and measure power usage
          •  Further investigate the perf regressions from processing IO events at higher priority on Unixes. Tracking issue for some thread pool experiments (.NET 8) #77665
          •  Hill climbing

            •  Disable hill climbing by default for a few previews and gather feedback
            •  Consider an alternative, to identify individual threads that appear to be stalled and responding more quickly similarly to cooperative blocking
          •  The overhead of work stealing is high, especially in bursty scenarios or in cases where the thread count is high, when threads are all trying to determine that there is no work left. Reduce time in .NET Threadpool's WorkStealingQueue.TrySteal method and ThreadPoolWorkQueue.Dequeue methods.  #10752
          Completed
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          Metadata
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          area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Tracking issue for threading work items · Issue #52701 · dotnet/runtime · GitHub
            Skip to content
            Tracking issue for threading work items #52701
            Open
            Open
            Tracking issue for threading work items#52701
            Assignees
            VSadov
            Labels
            area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
            Milestone
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            Description
            @kouvel
            kouvel
            opened on May 13, 2021
            •  Using less power when appropriate on machines with heterogenous cores

              • The thread pool parallelizes fairly quickly and likely causes cores to be unparked or for threads to be switched to a performance core. The goal is to experiment with a couple of ideas that may work and to measure the effects.
              •  Identify a mobile device scenario to improve and measure the current performance and power
              •  Experiment with using the online core count to limit concurrency while still being able to unpark cores if necessary for performance
              •  Experiment with spin-waiting less and measure power usage
            •  Further investigate the perf regressions from processing IO events at higher priority on Unixes. Tracking issue for some thread pool experiments (.NET 8) #77665
            •  Hill climbing

              •  Disable hill climbing by default for a few previews and gather feedback
              •  Consider an alternative, to identify individual threads that appear to be stalled and responding more quickly similarly to cooperative blocking
            •  The overhead of work stealing is high, especially in bursty scenarios or in cases where the thread count is high, when threads are all trying to determine that there is no work left. Reduce time in .NET Threadpool's WorkStealingQueue.TrySteal method and ThreadPoolWorkQueue.Dequeue methods.  #10752
            Completed
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            Metadata
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            area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
Tracking issue for threading work items · Issue #52701 · dotnet/runtime · GitHub
              Skip to content
              Tracking issue for threading work items #52701
              Open
              Open
              Tracking issue for threading work items#52701
              Assignees
              VSadov
              Labels
              area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
              Milestone
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              Description
              @kouvel
              kouvel
              opened on May 13, 2021
              •  Using less power when appropriate on machines with heterogenous cores

                • The thread pool parallelizes fairly quickly and likely causes cores to be unparked or for threads to be switched to a performance core. The goal is to experiment with a couple of ideas that may work and to measure the effects.
                •  Identify a mobile device scenario to improve and measure the current performance and power
                •  Experiment with using the online core count to limit concurrency while still being able to unpark cores if necessary for performance
                •  Experiment with spin-waiting less and measure power usage
              •  Further investigate the perf regressions from processing IO events at higher priority on Unixes. Tracking issue for some thread pool experiments (.NET 8) #77665
              •  Hill climbing

                •  Disable hill climbing by default for a few previews and gather feedback
                •  Consider an alternative, to identify individual threads that appear to be stalled and responding more quickly similarly to cooperative blocking
              •  The overhead of work stealing is high, especially in bursty scenarios or in cases where the thread count is high, when threads are all trying to determine that there is no work left. Reduce time in .NET Threadpool's WorkStealingQueue.TrySteal method and ThreadPoolWorkQueue.Dequeue methods.  #10752
              Completed
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              Metadata
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              area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
Tracking issue for threading work items · Issue #52701 · dotnet/runtime · GitHub
                Skip to content
                Tracking issue for threading work items #52701
                Open
                Open
                Tracking issue for threading work items#52701
                Assignees
                VSadov
                Labels
                area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
                Milestone
                Future
                Description
                @kouvel
                kouvel
                opened on May 13, 2021
                •  Using less power when appropriate on machines with heterogenous cores

                  • The thread pool parallelizes fairly quickly and likely causes cores to be unparked or for threads to be switched to a performance core. The goal is to experiment with a couple of ideas that may work and to measure the effects.
                  •  Identify a mobile device scenario to improve and measure the current performance and power
                  •  Experiment with using the online core count to limit concurrency while still being able to unpark cores if necessary for performance
                  •  Experiment with spin-waiting less and measure power usage
                •  Further investigate the perf regressions from processing IO events at higher priority on Unixes. Tracking issue for some thread pool experiments (.NET 8) #77665
                •  Hill climbing

                  •  Disable hill climbing by default for a few previews and gather feedback
                  •  Consider an alternative, to identify individual threads that appear to be stalled and responding more quickly similarly to cooperative blocking
                •  The overhead of work stealing is high, especially in bursty scenarios or in cases where the thread count is high, when threads are all trying to determine that there is no work left. Reduce time in .NET Threadpool's WorkStealingQueue.TrySteal method and ThreadPoolWorkQueue.Dequeue methods.  #10752
                Completed
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                Metadata
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                area-System.ThreadingtrackingThis issue is tracking the completion of other related issues.
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                  No branches or pull requests
                  Issue actions