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busy

busy is a small Linux utility designed to generate a high CPU workload for testing and observing CPU temperature and thermal behavior.

It automatically detects the number of CPUs currently online and creates one worker process per CPU. Each worker continuously consumes CPU time, allowing the system to reach a high CPU utilization level.

The main purpose is to make it easy to observe how CPU temperature changes under sustained load.

Usage

Build the program:

make prepare
make

Run it:

./busy

In another terminal, monitor the CPU sensors:

watch -n 1 sensors

You can also use busy together with watch in a pipeline:

./busy | watch -n 1 sensors

This is a convenient way to run the CPU workload while continuously refreshing the sensors output.

How it works

busy:

  1. Detects the number of online CPUs using POSIX sysconf().
  2. Creates one worker process for each CPU.
  3. Places the worker processes in the same process group.
  4. Each worker continuously consumes CPU time.
  5. Ctrl+C stops the workload.

The number of workers is therefore determined automatically by the system rather than being hard-coded.

Example

Run the stress test and monitor the CPU temperature:

./busy | watch -n 1 sensors

Example output:

Package id 0: +75.0°C
Core 0: +74.0°C
Core 1: +76.0°C
Core 2: +73.0°C
Core 3: +75.0°C

You can stop the test with Ctrl+C.

Requirements

  • Linux
  • POSIX-compatible C environment
  • make
  • A working lm-sensors installation for temperature monitoring

On Debian-based systems, install lm-sensors with:

sudo apt install lm-sensors

Author

Luis Miguel Arias

lmdelbahia@gmail.com

Warning

busy intentionally generates a sustained high CPU load.

CPU temperature can increase significantly while it is running. Make sure the system has adequate cooling and stop the program if temperatures become excessive.

This utility is intended for testing, diagnostics, thermal observation, and cooling-system verification.

License

This project is licensed under the MIT License.

About

No description, website, or topics provided.

Resources

Readme
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Stars

0 stars

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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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busy
busy is a small Linux utility designed to generate a high CPU workload for testing and observing CPU temperature and thermal behavior.
It automatically detects the number of CPUs currently online and creates one worker process per CPU. Each worker continuously consumes CPU time, allowing the system to reach a high CPU utilization level.
The main purpose is to make it easy to observe how CPU temperature changes under sustained load.
Usage
Build the program:
make prepare
make
Run it:
./busy
In another terminal, monitor the CPU sensors:
watch -n 1 sensors
You can also use busy together with watch in a pipeline:
./busy | watch -n 1 sensors
This is a convenient way to run the CPU workload while continuously refreshing the sensors output.
How it works
busy:
  1. Detects the number of online CPUs using POSIX sysconf().
  2. Creates one worker process for each CPU.
  3. Places the worker processes in the same process group.
  4. Each worker continuously consumes CPU time.
  5. Ctrl+C stops the workload.
The number of workers is therefore determined automatically by the system rather than being hard-coded.
Example
Run the stress test and monitor the CPU temperature:
./busy | watch -n 1 sensors
Example output:
Package id 0: +75.0°C
Core 0: +74.0°C
Core 1: +76.0°C
Core 2: +73.0°C
Core 3: +75.0°C

You can stop the test with Ctrl+C.
Requirements
  • Linux
  • POSIX-compatible C environment
  • make
  • A working lm-sensors installation for temperature monitoring
On Debian-based systems, install lm-sensors with:
sudo apt install lm-sensors
Author
Luis Miguel Arias
lmdelbahia@gmail.com
Warning
busy intentionally generates a sustained high CPU load.
CPU temperature can increase significantly while it is running. Make sure the system has adequate cooling and stop the program if temperatures become excessive.
This utility is intended for testing, diagnostics, thermal observation, and cooling-system verification.
License
This project is licensed under the MIT License.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
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0 forks
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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('^' + ".*" + '

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busy
busy is a small Linux utility designed to generate a high CPU workload for testing and observing CPU temperature and thermal behavior.
It automatically detects the number of CPUs currently online and creates one worker process per CPU. Each worker continuously consumes CPU time, allowing the system to reach a high CPU utilization level.
The main purpose is to make it easy to observe how CPU temperature changes under sustained load.
Usage
Build the program:
make prepare
make
Run it:
./busy
In another terminal, monitor the CPU sensors:
watch -n 1 sensors
You can also use busy together with watch in a pipeline:
./busy | watch -n 1 sensors
This is a convenient way to run the CPU workload while continuously refreshing the sensors output.
How it works
busy:
  1. Detects the number of online CPUs using POSIX sysconf().
  2. Creates one worker process for each CPU.
  3. Places the worker processes in the same process group.
  4. Each worker continuously consumes CPU time.
  5. Ctrl+C stops the workload.
The number of workers is therefore determined automatically by the system rather than being hard-coded.
Example
Run the stress test and monitor the CPU temperature:
./busy | watch -n 1 sensors
Example output:
Package id 0: +75.0°C
Core 0: +74.0°C
Core 1: +76.0°C
Core 2: +73.0°C
Core 3: +75.0°C

You can stop the test with Ctrl+C.
Requirements
  • Linux
  • POSIX-compatible C environment
  • make
  • A working lm-sensors installation for temperature monitoring
On Debian-based systems, install lm-sensors with:
sudo apt install lm-sensors
Author
Luis Miguel Arias
lmdelbahia@gmail.com
Warning
busy intentionally generates a sustained high CPU load.
CPU temperature can increase significantly while it is running. Make sure the system has adequate cooling and stop the program if temperatures become excessive.
This utility is intended for testing, diagnostics, thermal observation, and cooling-system verification.
License
This project is licensed under the MIT License.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
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0 forks
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, '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('^' + ".*" + '

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Repository files navigation
busy
busy is a small Linux utility designed to generate a high CPU workload for testing and observing CPU temperature and thermal behavior.
It automatically detects the number of CPUs currently online and creates one worker process per CPU. Each worker continuously consumes CPU time, allowing the system to reach a high CPU utilization level.
The main purpose is to make it easy to observe how CPU temperature changes under sustained load.
Usage
Build the program:
make prepare
make
Run it:
./busy
In another terminal, monitor the CPU sensors:
watch -n 1 sensors
You can also use busy together with watch in a pipeline:
./busy | watch -n 1 sensors
This is a convenient way to run the CPU workload while continuously refreshing the sensors output.
How it works
busy:
  1. Detects the number of online CPUs using POSIX sysconf().
  2. Creates one worker process for each CPU.
  3. Places the worker processes in the same process group.
  4. Each worker continuously consumes CPU time.
  5. Ctrl+C stops the workload.
The number of workers is therefore determined automatically by the system rather than being hard-coded.
Example
Run the stress test and monitor the CPU temperature:
./busy | watch -n 1 sensors
Example output:
Package id 0: +75.0°C
Core 0: +74.0°C
Core 1: +76.0°C
Core 2: +73.0°C
Core 3: +75.0°C

You can stop the test with Ctrl+C.
Requirements
  • Linux
  • POSIX-compatible C environment
  • make
  • A working lm-sensors installation for temperature monitoring
On Debian-based systems, install lm-sensors with:
sudo apt install lm-sensors
Author
Luis Miguel Arias
lmdelbahia@gmail.com
Warning
busy intentionally generates a sustained high CPU load.
CPU temperature can increase significantly while it is running. Make sure the system has adequate cooling and stop the program if temperatures become excessive.
This utility is intended for testing, diagnostics, thermal observation, and cooling-system verification.
License
This project is licensed under the MIT License.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
Packages
Contributors
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, '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" + '

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busy
busy is a small Linux utility designed to generate a high CPU workload for testing and observing CPU temperature and thermal behavior.
It automatically detects the number of CPUs currently online and creates one worker process per CPU. Each worker continuously consumes CPU time, allowing the system to reach a high CPU utilization level.
The main purpose is to make it easy to observe how CPU temperature changes under sustained load.
Usage
Build the program:
make prepare
make
Run it:
./busy
In another terminal, monitor the CPU sensors:
watch -n 1 sensors
You can also use busy together with watch in a pipeline:
./busy | watch -n 1 sensors
This is a convenient way to run the CPU workload while continuously refreshing the sensors output.
How it works
busy:
  1. Detects the number of online CPUs using POSIX sysconf().
  2. Creates one worker process for each CPU.
  3. Places the worker processes in the same process group.
  4. Each worker continuously consumes CPU time.
  5. Ctrl+C stops the workload.
The number of workers is therefore determined automatically by the system rather than being hard-coded.
Example
Run the stress test and monitor the CPU temperature:
./busy | watch -n 1 sensors
Example output:
Package id 0: +75.0°C
Core 0: +74.0°C
Core 1: +76.0°C
Core 2: +73.0°C
Core 3: +75.0°C

You can stop the test with Ctrl+C.
Requirements
  • Linux
  • POSIX-compatible C environment
  • make
  • A working lm-sensors installation for temperature monitoring
On Debian-based systems, install lm-sensors with:
sudo apt install lm-sensors
Author
Luis Miguel Arias
lmdelbahia@gmail.com
Warning
busy intentionally generates a sustained high CPU load.
CPU temperature can increase significantly while it is running. Make sure the system has adequate cooling and stop the program if temperatures become excessive.
This utility is intended for testing, diagnostics, thermal observation, and cooling-system verification.
License
This project is licensed under the MIT License.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
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, '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('^' + ".*" + '

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busy
busy is a small Linux utility designed to generate a high CPU workload for testing and observing CPU temperature and thermal behavior.
It automatically detects the number of CPUs currently online and creates one worker process per CPU. Each worker continuously consumes CPU time, allowing the system to reach a high CPU utilization level.
The main purpose is to make it easy to observe how CPU temperature changes under sustained load.
Usage
Build the program:
make prepare
make
Run it:
./busy
In another terminal, monitor the CPU sensors:
watch -n 1 sensors
You can also use busy together with watch in a pipeline:
./busy | watch -n 1 sensors
This is a convenient way to run the CPU workload while continuously refreshing the sensors output.
How it works
busy:
  1. Detects the number of online CPUs using POSIX sysconf().
  2. Creates one worker process for each CPU.
  3. Places the worker processes in the same process group.
  4. Each worker continuously consumes CPU time.
  5. Ctrl+C stops the workload.
The number of workers is therefore determined automatically by the system rather than being hard-coded.
Example
Run the stress test and monitor the CPU temperature:
./busy | watch -n 1 sensors
Example output:
Package id 0: +75.0°C
Core 0: +74.0°C
Core 1: +76.0°C
Core 2: +73.0°C
Core 3: +75.0°C

You can stop the test with Ctrl+C.
Requirements
  • Linux
  • POSIX-compatible C environment
  • make
  • A working lm-sensors installation for temperature monitoring
On Debian-based systems, install lm-sensors with:
sudo apt install lm-sensors
Author
Luis Miguel Arias
lmdelbahia@gmail.com
Warning
busy intentionally generates a sustained high CPU load.
CPU temperature can increase significantly while it is running. Make sure the system has adequate cooling and stop the program if temperatures become excessive.
This utility is intended for testing, diagnostics, thermal observation, and cooling-system verification.
License
This project is licensed under the MIT License.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
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Contributors
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, '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('^' + ".*" + '

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busy
busy is a small Linux utility designed to generate a high CPU workload for testing and observing CPU temperature and thermal behavior.
It automatically detects the number of CPUs currently online and creates one worker process per CPU. Each worker continuously consumes CPU time, allowing the system to reach a high CPU utilization level.
The main purpose is to make it easy to observe how CPU temperature changes under sustained load.
Usage
Build the program:
make prepare
make
Run it:
./busy
In another terminal, monitor the CPU sensors:
watch -n 1 sensors
You can also use busy together with watch in a pipeline:
./busy | watch -n 1 sensors
This is a convenient way to run the CPU workload while continuously refreshing the sensors output.
How it works
busy:
  1. Detects the number of online CPUs using POSIX sysconf().
  2. Creates one worker process for each CPU.
  3. Places the worker processes in the same process group.
  4. Each worker continuously consumes CPU time.
  5. Ctrl+C stops the workload.
The number of workers is therefore determined automatically by the system rather than being hard-coded.
Example
Run the stress test and monitor the CPU temperature:
./busy | watch -n 1 sensors
Example output:
Package id 0: +75.0°C
Core 0: +74.0°C
Core 1: +76.0°C
Core 2: +73.0°C
Core 3: +75.0°C

You can stop the test with Ctrl+C.
Requirements
  • Linux
  • POSIX-compatible C environment
  • make
  • A working lm-sensors installation for temperature monitoring
On Debian-based systems, install lm-sensors with:
sudo apt install lm-sensors
Author
Luis Miguel Arias
lmdelbahia@gmail.com
Warning
busy intentionally generates a sustained high CPU load.
CPU temperature can increase significantly while it is running. Make sure the system has adequate cooling and stop the program if temperatures become excessive.
This utility is intended for testing, diagnostics, thermal observation, and cooling-system verification.
License
This project is licensed under the MIT License.
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
0 watching
Forks
0 forks
Report repository
Releases
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Contributors
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, '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); }
})();
})();

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busy
busy is a small Linux utility designed to generate a high CPU workload for testing and observing CPU temperature and thermal behavior.
It automatically detects the number of CPUs currently online and creates one worker process per CPU. Each worker continuously consumes CPU time, allowing the system to reach a high CPU utilization level.
The main purpose is to make it easy to observe how CPU temperature changes under sustained load.
Usage
Build the program:
make prepare
make
Run it:
./busy
In another terminal, monitor the CPU sensors:
watch -n 1 sensors
You can also use busy together with watch in a pipeline:
./busy | watch -n 1 sensors
This is a convenient way to run the CPU workload while continuously refreshing the sensors output.
How it works
busy:
  1. Detects the number of online CPUs using POSIX sysconf().
  2. Creates one worker process for each CPU.
  3. Places the worker processes in the same process group.
  4. Each worker continuously consumes CPU time.
  5. Ctrl+C stops the workload.
The number of workers is therefore determined automatically by the system rather than being hard-coded.
Example
Run the stress test and monitor the CPU temperature:
./busy | watch -n 1 sensors
Example output:
Package id 0: +75.0°C
Core 0: +74.0°C
Core 1: +76.0°C
Core 2: +73.0°C
Core 3: +75.0°C

You can stop the test with Ctrl+C.
Requirements
  • Linux
  • POSIX-compatible C environment
  • make
  • A working lm-sensors installation for temperature monitoring
On Debian-based systems, install lm-sensors with:
sudo apt install lm-sensors
Author
Luis Miguel Arias
lmdelbahia@gmail.com
Warning
busy intentionally generates a sustained high CPU load.
CPU temperature can increase significantly while it is running. Make sure the system has adequate cooling and stop the program if temperatures become excessive.
This utility is intended for testing, diagnostics, thermal observation, and cooling-system verification.
License
This project is licensed under the MIT License.
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