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Progress bar can significantly impact cmdlet performance #2138

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Progress bar can significantly impact cmdlet performance#2138
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Issue-BugIssue has been identified as a bug in the productIssue has been identified as a bug in the productResolution-FixedThe issue is fixed.The issue is fixed.WG-Cmdletsgeneral cmdlet issuesgeneral cmdlet issuesWG-Engine-Performancecore PowerShell engine, interpreter, and runtime performancecore PowerShell engine, interpreter, and runtime performance
Milestone
6.0.0-GA
@SteveL-MSFT

Description

@SteveL-MSFT
SteveL-MSFT
opened on Aug 30, 2016
Issue body actions

Repro Steps :

Compare perf of WebClient, BITS and Invoke-WebRequest:

Measure-Command { $wc = New-Object System.Net.WebClient; $wc.DownloadFile("https://github.com/dotnet/corefx/archive/master.zip", "C:\Users\crispop\Desktop\master.zip") }


Days              : 0
Hours             : 0
Minutes           : 0
Seconds           : 3
Milliseconds      : 992
Ticks             : 39928426
TotalDays         : 4.62134560185185E-05
TotalHours        : 0.00110912294444444
TotalMinutes      : 0.0665473766666667
TotalSeconds      : 3.9928426
TotalMilliseconds : 3992.8426
Vs

Measure-Command { Invoke-WebRequest "https://github.com/dotnet/corefx/archive/master.zip" -OutFile "C:\Users\crispop\Desktop\master.zip" }


Days              : 0
Hours             : 0
Minutes           : 0
Seconds           : 50
Milliseconds      : 821
Ticks             : 508212825
TotalDays         : 0.000588209288194444
TotalHours        : 0.0141170229166667
TotalMinutes      : 0.847021375
TotalSeconds      : 50.8212825
TotalMilliseconds : 50821.2825

Vs

Measure-Command { Start-BitsTransfer -Source "https://github.com/dotnet/corefx/archive/master.zip" -Destination "C:\Users\crispop\Desktop\masterBits2.zip" }


Days              : 0
Hours             : 0
Minutes           : 0
Seconds           : 4
Milliseconds      : 506
Ticks             : 45062594
TotalDays         : 5.21557800925926E-05
TotalHours        : 0.00125173872222222
TotalMinutes      : 0.0751043233333333
TotalSeconds      : 4.5062594
TotalMilliseconds : 4506.2594

Expected: Transfer speeds don't differ too much (maybe Invoke-WebRequest should be a bit faster than BITS which performs the transfer in background.)

Actual: 10x slowdown for Invoke-WebRequest

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    Issue-BugIssue has been identified as a bug in the productIssue has been identified as a bug in the productResolution-FixedThe issue is fixed.The issue is fixed.WG-Cmdletsgeneral cmdlet issuesgeneral cmdlet issuesWG-Engine-Performancecore PowerShell engine, interpreter, and runtime performancecore PowerShell engine, interpreter, and runtime performance

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