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+<html lang="en"><head><meta charset="UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><title>Timing and profiling · ITensors.jl</title><script data-outdated-warner src="assets/warner.js"></script><link href="https://cdnjs.cloudflare.com/ajax/libs/lato-font/3.0.0/css/lato-font.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/juliamono/0.045/juliamono.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/fontawesome.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/solid.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.15.4/css/brands.min.css" rel="stylesheet" type="text/css"/><link href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.13.24/katex.min.css" rel="stylesheet" type="text/css"/><script>documenterBaseURL="."</script><script src="https://cdnjs.cloudflare.com/ajax/libs/require.js/2.3.6/require.min.js" data-main="assets/documenter.js"></script><script src="siteinfo.js"></script><script src="../versions.js"></script><link class="docs-theme-link" rel="stylesheet" type="text/css" href="assets/themes/documenter-dark.css" data-theme-name="documenter-dark" data-theme-primary-dark/><link class="docs-theme-link" rel="stylesheet" type="text/css" href="assets/themes/documenter-light.css" data-theme-name="documenter-light" data-theme-primary/><script src="assets/themeswap.js"></script><link href="assets/favicon.ico" rel="icon" type="image/x-icon"/></head><body><div id="documenter"><nav class="docs-sidebar"><a class="docs-logo" href="index.html"><img src="assets/logo.png" alt="ITensors.jl logo"/></a><div class="docs-package-name"><span class="docs-autofit"><a href="index.html">ITensors.jl</a></span></div><form class="docs-search" action="search.html"><input class="docs-search-query" id="documenter-search-query" name="q" type="text" placeholder="Search docs"/></form><ul class="docs-menu"><li><a class="tocitem" href="index.html">Introduction</a></li><li><span class="tocitem">Getting Started with ITensor</span><ul><li><a class="tocitem" href="getting_started/Installing.html">Installing Julia and ITensor</a></li><li><a class="tocitem" href="getting_started/RunningCodes.html">Running ITensor and Julia Codes</a></li><li><a class="tocitem" href="getting_started/DebugChecks.html">Enabling Debug Checks</a></li><li><a class="tocitem" href="getting_started/NextSteps.html">Next Steps</a></li></ul></li><li><span class="tocitem">Tutorials</span><ul><li><a class="tocitem" href="tutorials/DMRG.html">DMRG</a></li><li><a class="tocitem" href="tutorials/QN_DMRG.html">Quantum Number Conserving DMRG</a></li><li><a class="tocitem" href="tutorials/MPSTimeEvolution.html">MPS Time Evolution</a></li></ul></li><li><span class="tocitem">Code Examples</span><ul><li><a class="tocitem" href="examples/ITensor.html">ITensor Examples</a></li><li><a class="tocitem" href="examples/MPSandMPO.html">MPS and MPO Examples</a></li><li><a class="tocitem" href="examples/DMRG.html">DMRG Examples</a></li><li><a class="tocitem" href="examples/Physics.html">Physics (SiteType) System Examples</a></li></ul></li><li><span class="tocitem">Documentation</span><ul><li><a class="tocitem" href="IndexType.html">Index</a></li><li><a class="tocitem" href="IndexSetType.html">Index collections</a></li><li><a class="tocitem" href="ITensorType.html">ITensor</a></li><li><a class="tocitem" href="MPSandMPO.html">MPS and MPO</a></li><li><a class="tocitem" href="QN.html">QN</a></li><li><a class="tocitem" href="SiteType.html">SiteType and op, state, val functions</a></li><li><a class="tocitem" href="IncludedSiteTypes.html">SiteTypes Included with ITensor</a></li><li><input class="collapse-toggle" id="menuitem-5-8" type="checkbox"/><label class="tocitem" for="menuitem-5-8"><span class="docs-label">DMRG</span><i class="docs-chevron"></i></label><ul class="collapsed"><li><a class="tocitem" href="DMRG.html">DMRG</a></li><li><a class="tocitem" href="Sweeps.html">Sweeps</a></li><li><a class="tocitem" href="ProjMPO.html">ProjMPO</a></li><li><a class="tocitem" href="ProjMPOSum.html">ProjMPOSum</a></li><li><a class="tocitem" href="Observer.html">Observer System for DMRG</a></li><li><a class="tocitem" href="DMRGObserver.html">DMRGObserver</a></li></ul></li><li><a class="tocitem" href="OpSum.html">OpSum</a></li></ul></li><li><span class="tocitem">Frequently Asked Questions</span><ul><li><a class="tocitem" href="faq/JuliaAndCpp.html">Programming Language (Julia, C++, ...) FAQs</a></li><li><a class="tocitem" href="faq/DMRG.html">DMRG FAQs</a></li><li><a class="tocitem" href="faq/QN.html">Quantum Number (QN) FAQs</a></li><li><a class="tocitem" href="faq/Development.html">ITensor Development FAQs</a></li><li><a class="tocitem" href="faq/RelationshipToOtherLibraries.html">Relationship of ITensor to other tensor libraries FAQs</a></li><li><a class="tocitem" href="faq/JuliaPkg.html">Julia Package Manager FAQs</a></li><li><a class="tocitem" href="faq/HPC.html">High-Performance Computing FAQs</a></li></ul></li><li><span class="tocitem">Upgrade guides</span><ul><li><a class="tocitem" href="UpgradeGuide_0.1_to_0.2.html">Upgrading from 0.1 to 0.2</a></li></ul></li><li><a class="tocitem" href="Einsum.html">ITensor indices and Einstein notation</a></li><li><span class="tocitem">Advanced Usage Guide</span><ul><li><a class="tocitem" href="AdvancedUsageGuide.html">Advanced Usage Guide</a></li><li><a class="tocitem" href="Multithreading.html">Multithreading</a></li><li><a class="tocitem" href="RunningOnGPUs.html">Running on GPUs</a></li><li><a class="tocitem" href="QNTricks.html">Symmetric (QN conserving) tensors: background and usage</a></li><li class="is-active"><a class="tocitem" href="CodeTiming.html">Timing and profiling</a><ul class="internal"><li><a class="tocitem" href="#Timing-and-benchmarking"><span>Timing and benchmarking</span></a></li></ul></li><li><a class="tocitem" href="ContractionSequenceOptimization.html">Contraction sequence optimization</a></li><li><a class="tocitem" href="HDF5FileFormats.html">HDF5 File Formats</a></li></ul></li><li><a class="tocitem" href="DeveloperGuide.html">Developer Guide</a></li></ul><div class="docs-version-selector field has-addons"><div class="control"><span class="docs-label button is-static is-size-7">Version</span></div><div class="docs-selector control is-expanded"><div class="select is-fullwidth is-size-7"><select id="documenter-version-selector"></select></div></div></div></nav><div class="docs-main"><header class="docs-navbar"><nav class="breadcrumb"><ul class="is-hidden-mobile"><li><a class="is-disabled">Advanced Usage Guide</a></li><li class="is-active"><a href="CodeTiming.html">Timing and profiling</a></li></ul><ul class="is-hidden-tablet"><li class="is-active"><a href="CodeTiming.html">Timing and profiling</a></li></ul></nav><div class="docs-right"><a class="docs-edit-link" href="https://github.com/ITensor/ITensors.jl/blob/main/docs/src/CodeTiming.md" title="Edit on GitHub"><span class="docs-icon fab"></span><span class="docs-label is-hidden-touch">Edit on GitHub</span></a><a class="docs-settings-button fas fa-cog" id="documenter-settings-button" href="#" title="Settings"></a><a class="docs-sidebar-button fa fa-bars is-hidden-desktop" id="documenter-sidebar-button" href="#"></a></div></header><article class="content" id="documenter-page"><h1 id="Timing-and-Profiling-your-code"><a class="docs-heading-anchor" href="#Timing-and-Profiling-your-code">Timing and Profiling your code</a><a id="Timing-and-Profiling-your-code-1"></a><a class="docs-heading-anchor-permalink" href="#Timing-and-Profiling-your-code" title="Permalink"></a></h1><p>It is very important to time and profile your code to make sure your code is running as fast as possible. Here are some tips on timing and profiling your code.</p><p>If you are concerned about the performance of your code, a good place to start is Julia&#39;s <a href="https://docs.julialang.org/en/v1/manual/performance-tips/">performance tips</a>.</p><h2 id="Timing-and-benchmarking"><a class="docs-heading-anchor" href="#Timing-and-benchmarking">Timing and benchmarking</a><a id="Timing-and-benchmarking-1"></a><a class="docs-heading-anchor-permalink" href="#Timing-and-benchmarking" title="Permalink"></a></h2><p>Julia has many nice timing tools available. Tools like <a href="https://docs.julialang.org/en/v1/base/base/#Base.@time">@time</a> and <a href="https://github.com/KristofferC/TimerOutputs.jl">TimerOutputs</a> can be used to measure the time of specific lines of code. For microbenchmarking, we recommend the <a href="https://github.com/JuliaCI/BenchmarkTools.jl">BenchmarkTools</a> package. For profiling your code, see the Julia documentation on <a href="https://docs.julialang.org/en/v1/manual/profile/">profiling</a>.</p></article><nav class="docs-footer"><a class="docs-footer-prevpage" href="QNTricks.html">« Symmetric (QN conserving) tensors: background and usage</a><a class="docs-footer-nextpage" href="ContractionSequenceOptimization.html">Contraction sequence optimization »</a><div class="flexbox-break"></div><p class="footer-message">Powered by <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> and the <a href="https://julialang.org/">Julia Programming Language</a>.</p></nav></div><div class="modal" id="documenter-settings"><div class="modal-background"></div><div class="modal-card"><header class="modal-card-head"><p class="modal-card-title">Settings</p><button class="delete"></button></header><section class="modal-card-body"><p><label class="label">Theme</label><div class="select"><select id="documenter-themepicker"><option value="documenter-light">documenter-light</option><option value="documenter-dark">documenter-dark</option></select></div></p><hr/><p>This document was generated with <a href="https://github.com/JuliaDocs/Documenter.jl">Documenter.jl</a> version 0.27.25 on <span class="colophon-date" title="Saturday 25 May 2024 02:32">Saturday 25 May 2024</span>. Using Julia version 1.10.3.</p></section><footer class="modal-card-foot"></footer></div></div></div></body></html>