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clip-rule=evenodd /></svg></summary><div class=iUF1YW_dropdown><div><div class="iUF1YW_item iUF1YW_label">Getting Started</div><a href=/learn/getting-started/introduction-to-nodejs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Introduction to Node.js</span></a><a href=/learn/getting-started/how-much-javascript-do-you-need-to-know-to-use-nodejs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>How much JavaScript do you need to know to use Node.js?</span></a><a href=/learn/getting-started/differences-between-nodejs-and-the-browser aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Differences between Node.js and the Browser</span></a><a href=/learn/getting-started/the-v8-javascript-engine aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>The V8 JavaScript Engine</span></a><a href=/learn/getting-started/an-introduction-to-the-npm-package-manager aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>An introduction to the npm package manager</span></a><a href=/learn/getting-started/ecmascript-2015-es6-and-beyond aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>ECMAScript 2015 (ES6) and beyond</span></a><a href=/learn/getting-started/debugging aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Debugging Node.js</span></a><a href=/learn/getting-started/fetch aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Fetching data with Node.js</span></a><a href=/learn/getting-started/websocket aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>WebSocket client with Node.js</span></a><a href=/learn/getting-started/nodejs-the-difference-between-development-and-production aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Node.js, the difference between development and production</span></a><a href=/learn/getting-started/profiling aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Profiling Node.js Applications</span></a><a href=/learn/getting-started/nodejs-with-webassembly aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Node.js with WebAssembly</span></a><a href=/learn/getting-started/security-best-practices aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Security Best Practices</span></a><a href=/learn/getting-started/userland-migrations aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Introduction to Userland Migrations</span></a></div><div><div class="iUF1YW_item iUF1YW_label">Command Line</div><a href=/learn/command-line/run-nodejs-scripts-from-the-command-line aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Run Node.js scripts from the command line</span></a><a href=/learn/command-line/how-to-use-the-nodejs-repl aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>How to use the Node.js REPL</span></a><a href=/learn/command-line/output-to-the-command-line-using-nodejs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Output to the command line using Node.js</span></a><a href=/learn/command-line/accept-input-from-the-command-line-in-nodejs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Accept input from the command line in Node.js</span></a><a href=/learn/command-line/how-to-read-environment-variables-from-nodejs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>How to read environment variables from Node.js</span></a></div><div><div class="iUF1YW_item iUF1YW_label">HTTP</div><a href=/learn/http/anatomy-of-an-http-transaction aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Anatomy of an HTTP Transaction</span></a><a href=/learn/http/enterprise-network-configuration aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Enterprise Network Configuration</span></a></div><div><div class="iUF1YW_item iUF1YW_label">Manipulating Files</div><a href=/learn/manipulating-files/nodejs-file-stats aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Node.js file stats</span></a><a href=/learn/manipulating-files/nodejs-file-paths aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Node.js File Paths</span></a><a href=/learn/manipulating-files/reading-files-with-nodejs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Reading files with Node.js</span></a><a href=/learn/manipulating-files/writing-files-with-nodejs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Writing files with Node.js</span></a><a href=/learn/manipulating-files/working-with-file-descriptors-in-nodejs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Working with file descriptors in Node.js</span></a><a href=/learn/manipulating-files/working-with-folders-in-nodejs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Working with folders in Node.js</span></a><a href=/learn/manipulating-files/working-with-different-filesystems aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>How to work with Different Filesystems</span></a></div><div><div class="iUF1YW_item iUF1YW_label">Asynchronous Work</div><a href=/learn/asynchronous-work/javascript-asynchronous-programming-and-callbacks aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>JavaScript Asynchronous Programming and Callbacks</span></a><a href=/learn/asynchronous-work/asynchronous-flow-control aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Asynchronous flow control</span></a><a href=/learn/asynchronous-work/discover-promises-in-nodejs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Discover Promises in Node.js</span></a><a href=/learn/asynchronous-work/discover-javascript-timers aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Discover JavaScript Timers</span></a><a href=/learn/asynchronous-work/overview-of-blocking-vs-non-blocking aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Overview of Blocking vs Non-Blocking</span></a><a href=/learn/asynchronous-work/event-loop-timers-and-nexttick aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>The Node.js Event Loop</span></a><a href=/learn/asynchronous-work/the-nodejs-event-emitter aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>The Node.js Event Emitter</span></a><a href=/learn/asynchronous-work/understanding-processnexttick aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Understanding process.nextTick()</span></a><a href=/learn/asynchronous-work/understanding-setimmediate aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Understanding setImmediate()</span></a><a href=/learn/asynchronous-work/dont-block-the-event-loop aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Don't Block the Event Loop</span></a></div><div><div class="iUF1YW_item iUF1YW_label">TypeScript</div><a href=/learn/typescript/introduction aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Introduction to TypeScript</span></a><a href=/learn/typescript/run-natively aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Running TypeScript Natively</span></a><a href=/learn/typescript/transpile aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Running TypeScript code using transpilation</span></a><a href=/learn/typescript/run aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Running TypeScript with a runner</span></a><a href=/learn/typescript/publishing-a-ts-package aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Publishing a TypeScript package</span></a></div><div><div class="iUF1YW_item iUF1YW_label">Modules</div><a href=/learn/modules/how-to-use-streams aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>How to use streams</span></a><a href=/learn/modules/backpressuring-in-streams aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Backpressuring in Streams</span></a><a href=/learn/modules/publishing-a-package aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Publishing a package</span></a><a href=/learn/modules/publishing-node-api-modules aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>How to publish a Node-API package</span></a><a href=/learn/modules/abi-stability aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>ABI Stability</span></a></div><div><div class="iUF1YW_item iUF1YW_label">Diagnostics</div><a href=/learn/diagnostics/user-journey aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>User Journey</span></a><a href=/learn/diagnostics/memory aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Memory</span></a><a href=/learn/diagnostics/live-debugging aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Live Debugging</span></a><a href=/learn/diagnostics/poor-performance aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Poor Performance</span></a><a href=/learn/diagnostics/flame-graphs aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Flame Graphs</span></a></div><div><div class="iUF1YW_item iUF1YW_label">Test Runner</div><a href=/learn/test-runner/introduction aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Discovering Node.js's test runner</span></a><a href=/learn/test-runner/using-test-runner aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Using Node.js's test runner</span></a><a href=/learn/test-runner/mocking aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Mocking in tests</span></a><a href=/learn/test-runner/collecting-code-coverage aria-disabled=false rel=prefetch class="iUF1YW_item iUF1YW_text"><span>Collecting code coverage in Node.js</span></a></div></div></details></div></noscript><section class="_3ChhEq_navigation sRlY2a_group"><label class=sRlY2a_groupName>Getting Started</label><ul class=sRlY2a_itemList><li><a href=/learn/getting-started/introduction-to-nodejs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Introduction to Node.js</span></div></a><li><a href=/learn/getting-started/how-much-javascript-do-you-need-to-know-to-use-nodejs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>How much JavaScript do you need to know to use Node.js?</span></div></a><li><a href=/learn/getting-started/differences-between-nodejs-and-the-browser rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Differences between Node.js and the Browser</span></div></a><li><a href=/learn/getting-started/the-v8-javascript-engine rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>The V8 JavaScript Engine</span></div></a><li><a href=/learn/getting-started/an-introduction-to-the-npm-package-manager rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>An introduction to the npm package manager</span></div></a><li><a href=/learn/getting-started/ecmascript-2015-es6-and-beyond rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>ECMAScript 2015 (ES6) and beyond</span></div></a><li><a href=/learn/getting-started/debugging rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Debugging Node.js</span></div></a><li><a href=/learn/getting-started/fetch rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Fetching data with Node.js</span></div></a><li><a href=/learn/getting-started/websocket rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>WebSocket client with Node.js</span></div></a><li><a href=/learn/getting-started/nodejs-the-difference-between-development-and-production rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Node.js, the difference between development and production</span></div></a><li><a href=/learn/getting-started/profiling rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Profiling Node.js Applications</span></div></a><li><a href=/learn/getting-started/nodejs-with-webassembly rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Node.js with WebAssembly</span></div></a><li><a href=/learn/getting-started/security-best-practices rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Security Best Practices</span></div></a><li><a href=/learn/getting-started/userland-migrations rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Introduction to Userland Migrations</span></div></a></ul></section><section class="_3ChhEq_navigation sRlY2a_group"><label class=sRlY2a_groupName>Command Line</label><ul class=sRlY2a_itemList><li><a href=/learn/command-line/run-nodejs-scripts-from-the-command-line rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Run Node.js scripts from the command line</span></div></a><li><a href=/learn/command-line/how-to-use-the-nodejs-repl rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>How to use the Node.js REPL</span></div></a><li><a href=/learn/command-line/output-to-the-command-line-using-nodejs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Output to the command line using Node.js</span></div></a><li><a href=/learn/command-line/accept-input-from-the-command-line-in-nodejs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Accept input from the command line in Node.js</span></div></a><li><a href=/learn/command-line/how-to-read-environment-variables-from-nodejs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>How to read environment variables from Node.js</span></div></a></ul></section><section class="_3ChhEq_navigation sRlY2a_group"><label class=sRlY2a_groupName>HTTP</label><ul class=sRlY2a_itemList><li><a href=/learn/http/anatomy-of-an-http-transaction rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Anatomy of an HTTP Transaction</span></div></a><li><a href=/learn/http/enterprise-network-configuration rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Enterprise Network Configuration</span></div></a></ul></section><section class="_3ChhEq_navigation sRlY2a_group"><label class=sRlY2a_groupName>Manipulating Files</label><ul class=sRlY2a_itemList><li><a href=/learn/manipulating-files/nodejs-file-stats rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Node.js file stats</span></div></a><li><a href=/learn/manipulating-files/nodejs-file-paths rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Node.js File Paths</span></div></a><li><a href=/learn/manipulating-files/reading-files-with-nodejs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Reading files with Node.js</span></div></a><li><a href=/learn/manipulating-files/writing-files-with-nodejs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Writing files with Node.js</span></div></a><li><a href=/learn/manipulating-files/working-with-file-descriptors-in-nodejs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Working with file descriptors in Node.js</span></div></a><li><a href=/learn/manipulating-files/working-with-folders-in-nodejs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Working with folders in Node.js</span></div></a><li><a href=/learn/manipulating-files/working-with-different-filesystems rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>How to work with Different Filesystems</span></div></a></ul></section><section class="_3ChhEq_navigation sRlY2a_group"><label class=sRlY2a_groupName>Asynchronous Work</label><ul class=sRlY2a_itemList><li><a href=/learn/asynchronous-work/javascript-asynchronous-programming-and-callbacks rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>JavaScript Asynchronous Programming and Callbacks</span></div></a><li><a href=/learn/asynchronous-work/asynchronous-flow-control rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Asynchronous flow control</span></div></a><li><a href=/learn/asynchronous-work/discover-promises-in-nodejs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Discover Promises in Node.js</span></div></a><li><a href=/learn/asynchronous-work/discover-javascript-timers rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Discover JavaScript Timers</span></div></a><li><a href=/learn/asynchronous-work/overview-of-blocking-vs-non-blocking rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Overview of Blocking vs Non-Blocking</span></div></a><li><a href=/learn/asynchronous-work/event-loop-timers-and-nexttick rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>The Node.js Event Loop</span></div></a><li><a href=/learn/asynchronous-work/the-nodejs-event-emitter rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>The Node.js Event Emitter</span></div></a><li><a href=/learn/asynchronous-work/understanding-processnexttick rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Understanding process.nextTick()</span></div></a><li><a href=/learn/asynchronous-work/understanding-setimmediate rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Understanding setImmediate()</span></div></a><li><a href=/learn/asynchronous-work/dont-block-the-event-loop rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Don't Block the Event Loop</span></div></a></ul></section><section class="_3ChhEq_navigation sRlY2a_group"><label class=sRlY2a_groupName>TypeScript</label><ul class=sRlY2a_itemList><li><a href=/learn/typescript/introduction rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Introduction to TypeScript</span></div></a><li><a href=/learn/typescript/run-natively rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Running TypeScript Natively</span></div></a><li><a href=/learn/typescript/transpile rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Running TypeScript code using transpilation</span></div></a><li><a href=/learn/typescript/run rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Running TypeScript with a runner</span></div></a><li><a href=/learn/typescript/publishing-a-ts-package rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Publishing a TypeScript package</span></div></a></ul></section><section class="_3ChhEq_navigation sRlY2a_group"><label class=sRlY2a_groupName>Modules</label><ul class=sRlY2a_itemList><li><a href=/learn/modules/how-to-use-streams rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>How to use streams</span></div></a><li><a href=/learn/modules/backpressuring-in-streams rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Backpressuring in Streams</span></div></a><li><a href=/learn/modules/publishing-a-package rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Publishing a package</span></div></a><li><a href=/learn/modules/publishing-node-api-modules rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>How to publish a Node-API package</span></div></a><li><a href=/learn/modules/abi-stability rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>ABI Stability</span></div></a></ul></section><section class="_3ChhEq_navigation sRlY2a_group"><label class=sRlY2a_groupName>Diagnostics</label><ul class=sRlY2a_itemList><li><a href=/learn/diagnostics/user-journey rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>User Journey</span></div></a><li><a href=/learn/diagnostics/memory rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Memory</span></div></a><li><a href=/learn/diagnostics/live-debugging rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Live Debugging</span></div></a><li><a href=/learn/diagnostics/poor-performance rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Poor Performance</span></div></a><li><a href=/learn/diagnostics/flame-graphs rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Flame Graphs</span></div></a></ul></section><section class="_3ChhEq_navigation sRlY2a_group"><label class=sRlY2a_groupName>Test Runner</label><ul class=sRlY2a_itemList><li><a href=/learn/test-runner/introduction rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Discovering Node.js's test runner</span></div></a><li><a href=/learn/test-runner/using-test-runner rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Using Node.js's test runner</span></div></a><li><a href=/learn/test-runner/mocking rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Mocking in tests</span></div></a><li><a href=/learn/test-runner/collecting-code-coverage rel=prefetch class=UNVuiW_item><div class=UNVuiW_label><span>Collecting code coverage in Node.js</span></div></a></ul></section></aside><div><div><details class=xdcBXG_details><summary class=xdcBXG_summary><svg fill=none viewBox="0 0 24 24" stroke-width=1.5 stroke=currentColor aria-hidden=true data-slot=icon class=xdcBXG_icon><path stroke-linecap=round stroke-linejoin=round d="m8.25 4.5 7.5 7.5-7.5 7.5"/></svg> On this page</summary><ul class=xdcBXG_list><li><a href=#my-process-runs-out-of-memory class=xdcBXG_link>My process runs out of memory</a><li><a href=#symptoms class="xdcBXG_depthThree xdcBXG_link">Symptoms</a><li><a href=#side-effects class="xdcBXG_depthThree xdcBXG_link">Side Effects</a><li><a href=#my-process-utilizes-memory-inefficiently class=xdcBXG_link>My process utilizes memory inefficiently</a><li><a href=#symptoms-1 class="xdcBXG_depthThree xdcBXG_link">Symptoms</a><li><a href=#side-effects-1 class="xdcBXG_depthThree xdcBXG_link">Side Effects</a><li><a href=#debugging class=xdcBXG_link>Debugging</a></ul></details><br><main><div><h1 id=memory><a href=#memory class=anchor>Memory</a></h1></div> |
| <p>In this document you can learn about how to debug memory related issues.<div><h2 id=my-process-runs-out-of-memory><a href=#my-process-runs-out-of-memory class=anchor>My process runs out of memory</a></h2></div> |
| <p>Node.js <em>(JavaScript)</em> is a garbage collected language, so having memory |
| leaks is possible through retainers. As Node.js applications are usually |
| multi-tenant, business critical, and long-running, providing an accessible and |
| efficient way of finding a memory leak is essential.</p> |
| <p>You can also fine-tune memory to get specific results. Check out |
| <a href=/learn/diagnostics/memory/understanding-and-tuning-memory>Understanding and Tuning Memory</a> for more details.<div><h3 id=symptoms><a href=#symptoms class=anchor>Symptoms</a></h3></div> |
| <p>The user observes continuously increasing memory usage <em>(can be fast or slow, |
| over days or even weeks)</em> then sees the process crashing and restarting by the |
| process manager. The process is maybe running slower than before and the |
| restarts cause some requests to fail <em>(load balancer responds with 502)</em>.<div><h3 id=side-effects><a href=#side-effects class=anchor>Side Effects</a></h3></div> |
| <ul> |
| <li>Process restarts due to the memory exhaustion and requests are dropped |
| on the floor</li> |
| <li>Increased GC activity leads to higher CPU usage and slower response time |
| <ul> |
| <li>GC blocking the Event Loop causing slowness</li> |
| </ul> |
| </li> |
| <li>Increased memory swapping slows down the process (GC activity)</li> |
| <li>May not have enough available memory to get a Heap Snapshot</li> |
| </ul><div><h2 id=my-process-utilizes-memory-inefficiently><a href=#my-process-utilizes-memory-inefficiently class=anchor>My process utilizes memory inefficiently</a></h2></div><div><h3 id=symptoms-1><a href=#symptoms-1 class=anchor>Symptoms</a></h3></div> |
| <p>The application uses an unexpected amount of memory and/or we observe elevated |
| garbage collector activity.<div><h3 id=side-effects-1><a href=#side-effects-1 class=anchor>Side Effects</a></h3></div> |
| <ul> |
| <li>An elevated number of page faults</li> |
| <li>Higher GC activity and CPU usage</li> |
| </ul><div><h2 id=debugging><a href=#debugging class=anchor>Debugging</a></h2></div> |
| <p>Most memory issues can be solved by determining how much space our specific |
| type of objects take and what variables are preventing them from being garbage |
| collected. It can also help to know the allocation pattern of our program over |
| time.</p> |
| <ul> |
| <li><a href=/learn/diagnostics/memory/using-heap-profiler/>Using Heap Profiler</a></li> |
| <li><a href=/learn/diagnostics/memory/using-heap-snapshot/>Using Heap Snapshot</a></li> |
| <li><a href=/learn/diagnostics/memory/using-gc-traces/>GC Traces</a></li> |
| </ul></main></div><aside class=eaXTXq_wrapper><dl><dt>Reading Time<dd>2 min read<dt>Contribute<dd><svg width=20 height=20 viewBox="0 0 20 20" fill=currentColor class="dark:fill-neutral-100 fill-neutral-700"><path d="M10 1.25C5.16562 1.25 1.25 5.16562 1.25 10C1.25 13.8719 3.75469 17.1422 7.23281 18.3016C7.67031 18.3781 7.83437 18.1156 7.83437 17.8859C7.83437 17.6781 7.82344 16.9891 7.82344 16.2563C5.625 16.6609 5.05625 15.7203 4.88125 15.2281C4.78281 14.9766 4.35625 14.2 3.98438 13.9922C3.67812 13.8281 3.24063 13.4234 3.97344 13.4125C4.6625 13.4016 5.15469 14.0469 5.31875 14.3094C6.10625 15.6328 7.36406 15.2609 7.86719 15.0312C7.94375 14.4625 8.17344 14.0797 8.425 13.8609C6.47813 13.6422 4.44375 12.8875 4.44375 9.54062C4.44375 8.58906 4.78281 7.80156 5.34062 7.18906C5.25313 6.97031 4.94687 6.07344 5.42812 4.87031C5.42812 4.87031 6.16094 4.64063 7.83437 5.76719C8.53438 5.57031 9.27813 5.47187 10.0219 5.47187C10.7656 5.47187 11.5094 5.57031 12.2094 5.76719C13.8828 4.62969 14.6156 4.87031 14.6156 4.87031C15.0969 6.07344 14.7906 6.97031 14.7031 7.18906C15.2609 7.80156 15.6 8.57812 15.6 9.54062C15.6 12.8984 13.5547 13.6422 11.6078 13.8609C11.925 14.1344 12.1984 14.6594 12.1984 15.4797C12.1984 16.65 12.1875 17.5906 12.1875 17.8859C12.1875 18.1156 12.3516 18.3891 12.7891 18.3016C14.5261 17.7152 16.0355 16.5988 17.1048 15.1096C18.1741 13.6204 18.7495 11.8333 18.75 10C18.75 5.16562 14.8344 1.25 10 1.25Z"/></svg><a href=https://github.com/nodejs/learn/edit/main/pages/diagnostics/memory/index.md>Edit this page</a><dt>Table of Contents<dd><ol><li><a href=#my-process-runs-out-of-memory>My process runs out of memory</a><li class=pl-2><a href=#symptoms>Symptoms</a><li class=pl-2><a href=#side-effects>Side Effects</a><li><a href=#my-process-utilizes-memory-inefficiently>My process utilizes memory inefficiently</a><li class=pl-2><a href=#symptoms-1>Symptoms</a><li class=pl-2><a href=#side-effects-1>Side Effects</a><li><a href=#debugging>Debugging</a></ol></dl></aside></div></div><footer class=BbNFNW_container><div class=BbNFNW_innerContainer><div class=BbNFNW_row><div class=BbNFNW_sectionPrimary></div><div class=BbNFNW_sectionSecondary><div class=BbNFNW_social><a href=https://github.com/nodejs/node class="J9yHBG_footer J9yHBG_navItem"><span class=J9yHBG_label><svg width=20 height=20 viewBox="0 0 20 20" fill=currentColor aria-label=https://github.com/nodejs/node><path d="M10 1.25C5.16562 1.25 1.25 5.16562 1.25 10C1.25 13.8719 3.75469 17.1422 7.23281 18.3016C7.67031 18.3781 7.83437 18.1156 7.83437 17.8859C7.83437 17.6781 7.82344 16.9891 7.82344 16.2563C5.625 16.6609 5.05625 15.7203 4.88125 15.2281C4.78281 14.9766 4.35625 14.2 3.98438 13.9922C3.67812 13.8281 3.24063 13.4234 3.97344 13.4125C4.6625 13.4016 5.15469 14.0469 5.31875 14.3094C6.10625 15.6328 7.36406 15.2609 7.86719 15.0312C7.94375 14.4625 8.17344 14.0797 8.425 13.8609C6.47813 13.6422 4.44375 12.8875 4.44375 9.54062C4.44375 8.58906 4.78281 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