[jira] [Commented] (LOG4NET-585) log4net became very slow with caller location information after Windows 10 Fall Creators Update (1709)

["Tobias Bindel (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4NET-585?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16289947#comment-16289947 ] 

Tobias Bindel commented on LOG4NET-585:
---------------------------------------

It seems the issue is know by Microsoft since about a month.

https://connect.microsoft.com/VisualStudio/feedback/details/3143189/after-installing-windows-10-1709-update-creating-a-stacktrace-class-has-become-a-magnitude-slower
https://support.microsoft.com/en-us/help/4057154/performance-of-system-diagnostics-stackframe-degrades-in-windows-10-17

Creating an instance of StackTrace with NeedFileInfo true is significant slower.

> log4net became very slow with caller location information after Windows 10 Fall Creators Update (1709)
> ------------------------------------------------------------------------------------------------------
>
>                 Key: LOG4NET-585
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-585
>             Project: Log4net
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0.8
>         Environment: Windows 10 Pro 64-Bit (1709)
> .NET Framework 4.5.2
> Visual Studio 2015
>            Reporter: Tobias Bindel
>            Assignee: Dominik Psenner
>            Priority: Critical
>              Labels: performance, windows
>         Attachments: Log4Net.CSharp.zip
>
>
> The documentation of log4net points out that the logging of caller location information can be very slow and shouldn't be used unless the performance of the software is not affected. And until the Windows 10 Fall Creators Update this was the case. 
> But after the Windows update (1709) the performance with caller location information like %C %M %L is about 100 times slower than without. The following results are based on the simple Visual Studio project attached to this issue.
> _Results before Windows update (1709)_
> without %C %M %L: Logging of 1000 iterations took: 18 ms.
> with %C %M %L: Logging of 1000 iterations took: 81 ms.
> _Results after Windows update (1709)_
> without %C %M %L: Logging of 1000 iterations took: 14 ms.
> with %C %M %L: Logging of 1000 iterations took: 1502 ms.
> I hope this issue can be fixed or a workaround offered. Thanks in advance!



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