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Make the static constructor of PSVersionInfo run faster for stable PowerShell releases #18210

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merged 7 commits into from Oct 6, 2022
Merged

Make the static constructor of PSVersionInfo run faster for stable PowerShell releases #18210

merged 7 commits into from Oct 6, 2022

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daxian-dbw
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@daxian-dbw daxian-dbw commented Oct 3, 2022 •
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PR Summary

Make the static constructor of PSVersionInfo run faster for stable PowerShell releases.

Major changes are:

  1. Fast parse the pre-defined PowerShell version string, instead of going through SemanticVersion.Parse(string).
  2. Change all legacy versions to use Version instead of SemanticVersion, to avoid the overhead of casting when using them for $PSVersionTable.PSCompatibleVersions.
  3. Simplify the constructor of ConsoleHostRawUserInterface to not use Regex.

PR Checklist

@daxian-dbw daxian-dbw added CL-General Indicates that a PR should be marked as a general cmdlet change in the Change Log CL-Performance Indicates that a PR should be marked as a performance improvement in the Change Log and removed CL-General Indicates that a PR should be marked as a general cmdlet change in the Change Log labels Oct 3, 2022
daxian-dbw
daxian-dbw commented Oct 3, 2022
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src/Microsoft.PowerShell.ConsoleHost/host/msh/ConsoleHostRawUserInterface.cs
titlePattern = Regex.Escape(titlePattern)
.Replace(@"\{1}", ".*")
.Replace(@"\{0}", Regex.Escape(prefix));
if (!Regex.IsMatch(this.WindowTitle, titlePattern))
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@daxian-dbw daxian-dbw Oct 3, 2022 •
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This is to get rid of using Regex at startup, which is not necessary.

@daxian-dbw daxian-dbw requested review from iSazonov, SeeminglyScience and adityapatwardhan and removed request for anmenaga October 3, 2022 21:42
@daxian-dbw daxian-dbw mentioned this pull request Oct 4, 2022
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iSazonov commented Oct 5, 2022

@daxian-dbw I think we should use SG to put all that are used at startup (one const I guess?) in separate helper so that exclude PSVersion static class initialization at startup. As result we can reduce number our optimizations in PSVersion class and safe our time.

daxian-dbw added a commit to iSazonov/PowerShell that referenced this pull request Oct 6, 2022
@daxian-dbw
Merge part of PowerShell#18210 to the source generator and also refac…
f09bd4d 
…tor it
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This PR has 62 quantified lines of changes. In general, a change size of upto 200 lines is ideal for the best PR experience!

Quantification details 

Label      : Small
Size       : +27 -35
Percentile : 24.8%

Total files changed: 3

Change summary by file extension:
.cs : +26 -31
.resx : +1 -4

Change counts above are quantified counts, based on the PullRequestQuantifier customizations.

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@daxian-dbw
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@iSazonov @SeeminglyScience The FastParsePSVersion function and its related changes were reverted, because I have already integrated those changes to the source generated PR. See #15603 (review) and that PR has been updated.

So, what's left in this PR is much simpler. Please review again.

SeeminglyScience
SeeminglyScience approved these changes Oct 6, 2022
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LGTM! Love it ❤️

@daxian-dbw daxian-dbw merged commit 7073525 into PowerShell:master Oct 6, 2022
40 checks passed
@daxian-dbw daxian-dbw deleted the psv branch October 6, 2022 22:26
gregsdennis pushed a commit to gregsdennis/PowerShell that referenced this pull request Mar 15, 2023
@daxian-dbw @gregsdennis
Avoid using Regex when not necessary (PowerShell#18210)
c9d5225
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@iSazonov iSazonov iSazonov approved these changes

@SeeminglyScience SeeminglyScience SeeminglyScience approved these changes

@adityapatwardhan adityapatwardhan

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@iSazonov iSazonov

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