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c4fun

This project contains several C independent programs and some common libraries for Linux used to illustrate some architectural details of the hardware executing the programs.

To compile programs, just run make from the project's root directory.

The different programs are:

  • cache_tests: Determine through timing memory accesses cache levels and sizes.

  • mem_alloc: Library used by other programs to allocate and fill memory ready for pointer chasing. Each memroy "cell" points to another memory cell in the memory region. The library provide sequential memory filling and pseudo-random memory filling.

  • pebs_tests: For Intel Nehalem processors only. Benchmark illustrating the PEBS (Precise Event Based Sampling) load latency feature provied by Intel Nehalem's PMU (Performance Monitoring Unit) hardware.

  • perf_event_open_tests: Simple example of how using the Linux perf_event_open system call providing an abstraction of underlying PMU.

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Some benchmarks to evaluate NUMA remote memory overhead

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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n 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;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

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c4fun
This project contains several C independent programs and some common
libraries for Linux used to illustrate some architectural details of
the hardware executing the programs.
To compile programs, just run make from the project's root directory.
The different programs are:
  • cache_tests: Determine through timing memory accesses cache
levels and sizes.
  • mem_alloc: Library used by other programs to allocate and fill
memory ready for pointer chasing. Each memroy "cell" points to
another memory cell in the memory region. The library provide
sequential memory filling and pseudo-random memory filling.
  • pebs_tests: For Intel Nehalem processors only. Benchmark
illustrating the PEBS (Precise Event Based Sampling) load latency
feature provied by Intel Nehalem's PMU (Performance Monitoring
Unit) hardware.
  • perf_event_open_tests: Simple example of how using the Linux
perf_event_open system call providing an abstraction of underlying
PMU.
About
Some benchmarks to evaluate NUMA remote memory overhead
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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c4fun
This project contains several C independent programs and some common
libraries for Linux used to illustrate some architectural details of
the hardware executing the programs.
To compile programs, just run make from the project's root directory.
The different programs are:
  • cache_tests: Determine through timing memory accesses cache
levels and sizes.
  • mem_alloc: Library used by other programs to allocate and fill
memory ready for pointer chasing. Each memroy "cell" points to
another memory cell in the memory region. The library provide
sequential memory filling and pseudo-random memory filling.
  • pebs_tests: For Intel Nehalem processors only. Benchmark
illustrating the PEBS (Precise Event Based Sampling) load latency
feature provied by Intel Nehalem's PMU (Performance Monitoring
Unit) hardware.
  • perf_event_open_tests: Simple example of how using the Linux
perf_event_open system call providing an abstraction of underlying
PMU.
About
Some benchmarks to evaluate NUMA remote memory overhead
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
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c4fun
This project contains several C independent programs and some common
libraries for Linux used to illustrate some architectural details of
the hardware executing the programs.
To compile programs, just run make from the project's root directory.
The different programs are:
  • cache_tests: Determine through timing memory accesses cache
levels and sizes.
  • mem_alloc: Library used by other programs to allocate and fill
memory ready for pointer chasing. Each memroy "cell" points to
another memory cell in the memory region. The library provide
sequential memory filling and pseudo-random memory filling.
  • pebs_tests: For Intel Nehalem processors only. Benchmark
illustrating the PEBS (Precise Event Based Sampling) load latency
feature provied by Intel Nehalem's PMU (Performance Monitoring
Unit) hardware.
  • perf_event_open_tests: Simple example of how using the Linux
perf_event_open system call providing an abstraction of underlying
PMU.
About
Some benchmarks to evaluate NUMA remote memory overhead
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
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Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
BranchesTags
Repository files navigation
c4fun
This project contains several C independent programs and some common
libraries for Linux used to illustrate some architectural details of
the hardware executing the programs.
To compile programs, just run make from the project's root directory.
The different programs are:
  • cache_tests: Determine through timing memory accesses cache
levels and sizes.
  • mem_alloc: Library used by other programs to allocate and fill
memory ready for pointer chasing. Each memroy "cell" points to
another memory cell in the memory region. The library provide
sequential memory filling and pseudo-random memory filling.
  • pebs_tests: For Intel Nehalem processors only. Benchmark
illustrating the PEBS (Precise Event Based Sampling) load latency
feature provied by Intel Nehalem's PMU (Performance Monitoring
Unit) hardware.
  • perf_event_open_tests: Simple example of how using the Linux
perf_event_open system call providing an abstraction of underlying
PMU.
About
Some benchmarks to evaluate NUMA remote memory overhead
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
c4fun
This project contains several C independent programs and some common
libraries for Linux used to illustrate some architectural details of
the hardware executing the programs.
To compile programs, just run make from the project's root directory.
The different programs are:
  • cache_tests: Determine through timing memory accesses cache
levels and sizes.
  • mem_alloc: Library used by other programs to allocate and fill
memory ready for pointer chasing. Each memroy "cell" points to
another memory cell in the memory region. The library provide
sequential memory filling and pseudo-random memory filling.
  • pebs_tests: For Intel Nehalem processors only. Benchmark
illustrating the PEBS (Precise Event Based Sampling) load latency
feature provied by Intel Nehalem's PMU (Performance Monitoring
Unit) hardware.
  • perf_event_open_tests: Simple example of how using the Linux
perf_event_open system call providing an abstraction of underlying
PMU.
About
Some benchmarks to evaluate NUMA remote memory overhead
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
BranchesTags
Repository files navigation
c4fun
This project contains several C independent programs and some common
libraries for Linux used to illustrate some architectural details of
the hardware executing the programs.
To compile programs, just run make from the project's root directory.
The different programs are:
  • cache_tests: Determine through timing memory accesses cache
levels and sizes.
  • mem_alloc: Library used by other programs to allocate and fill
memory ready for pointer chasing. Each memroy "cell" points to
another memory cell in the memory region. The library provide
sequential memory filling and pseudo-random memory filling.
  • pebs_tests: For Intel Nehalem processors only. Benchmark
illustrating the PEBS (Precise Event Based Sampling) load latency
feature provied by Intel Nehalem's PMU (Performance Monitoring
Unit) hardware.
  • perf_event_open_tests: Simple example of how using the Linux
perf_event_open system call providing an abstraction of underlying
PMU.
About
Some benchmarks to evaluate NUMA remote memory overhead
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

Skip to content
BranchesTags
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c4fun
This project contains several C independent programs and some common
libraries for Linux used to illustrate some architectural details of
the hardware executing the programs.
To compile programs, just run make from the project's root directory.
The different programs are:
  • cache_tests: Determine through timing memory accesses cache
levels and sizes.
  • mem_alloc: Library used by other programs to allocate and fill
memory ready for pointer chasing. Each memroy "cell" points to
another memory cell in the memory region. The library provide
sequential memory filling and pseudo-random memory filling.
  • pebs_tests: For Intel Nehalem processors only. Benchmark
illustrating the PEBS (Precise Event Based Sampling) load latency
feature provied by Intel Nehalem's PMU (Performance Monitoring
Unit) hardware.
  • perf_event_open_tests: Simple example of how using the Linux
perf_event_open system call providing an abstraction of underlying
PMU.
About
Some benchmarks to evaluate NUMA remote memory overhead
Resources
Readme
Activity
Stars
0 stars
Watchers
1 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
Languages