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62 lines
2.6 KiB
ReStructuredText
.. _windows_performance:
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Windows performance
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===================
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This document offers some performance optimizations you might like to apply to
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your Windows hosts to speed them up specifically in the context of using Ansible
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with them, and generally.
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Optimize PowerShell performance to reduce Ansible task overhead
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---------------------------------------------------------------
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To speed up the startup of PowerShell by around 10x, run the following
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PowerShell snippet in an Administrator session. Expect it to take tens of
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seconds.
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.. note::
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If native images have already been created by the ngen task or service, you
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will observe no difference in performance (but this snippet will at that
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point execute faster than otherwise).
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.. code-block:: powershell
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function Optimize-PowershellAssemblies {
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# NGEN powershell assembly, improves startup time of powershell by 10x
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$old_path = $env:path
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try {
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$env:path = [Runtime.InteropServices.RuntimeEnvironment]::GetRuntimeDirectory()
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[AppDomain]::CurrentDomain.GetAssemblies() | % {
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if (! $_.location) {continue}
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$Name = Split-Path $_.location -leaf
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if ($Name.startswith("Microsoft.PowerShell.")) {
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Write-Progress -Activity "Native Image Installation" -Status "$name"
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ngen install $_.location | % {"`t$_"}
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}
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}
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} finally {
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$env:path = $old_path
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}
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}
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Optimize-PowershellAssemblies
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PowerShell is used by every Windows Ansible module. This optimization reduces
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the time PowerShell takes to start up, removing that overhead from every invocation.
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This snippet uses `the native image generator, ngen <https://docs.microsoft.com/en-us/dotnet/framework/tools/ngen-exe-native-image-generator#WhenToUse>`_
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to pre-emptively create native images for the assemblies that PowerShell relies on.
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Fix high-CPU-on-boot for VMs/cloud instances
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--------------------------------------------
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If you are creating golden images to spawn instances from, you can avoid a disruptive
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high CPU task near startup via `processing the ngen queue <https://docs.microsoft.com/en-us/dotnet/framework/tools/ngen-exe-native-image-generator#native-image-service>`_
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within your golden image creation, if you know the CPU types won't change between
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golden image build process and runtime.
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Place the following near the end of your playbook, bearing in mind the factors that can cause native images to be invalidated (`see MSDN <https://docs.microsoft.com/en-us/dotnet/framework/tools/ngen-exe-native-image-generator#native-images-and-jit-compilation>`_).
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.. code-block:: yaml
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- name: generate native .NET images for CPU
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win_dotnet_ngen:
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