Most accurate timing in VB .NET??

[Howard Kaikow]

In VB, I've developed the habit of using the API QueryPerformanc eCounter to
achieve the most accurate timings.

In VB .NET, one can use TotalMillisecon ds and Ticks to convert time to
milliseconds.
Is this as accurate as using the QueryPerformanc eCounter?

What is the resolution of Now in VB .NET?

For example:

Dim datEnd As Date
Dim datStart As Date

datStart = Now
' Do stuff here
datEnd = Now
MsgBox((datEnd. Ticks - datStart.Ticks) / 10000 & " milliseconds(Ti cks)" &
vbCrLf & _
datEnd.Subtract (datStart).Tota lMilliseconds.T oString() & "
milliseconds(Su btract)")

--
http://www.standards.com/; See Howard Kaikow's web site.

[Ken Tucker [MVP]]

Re: Most accurate timing in VB .NET??

Hi,

http://msdn.microsoft.com/msdnmag/issues/04/03/HighResolutionTimer/default.aspx

Ken
--------------
"Howard Kaikow" <kaikow@standar ds.com> wrote in message
news:uM3R5l4LEH A.128@TK2MSFTNG P09.phx.gbl...[color=blue]
> In VB, I've developed the habit of using the API QueryPerformanc eCounter
> to
> achieve the most accurate timings.
>
> In VB .NET, one can use TotalMillisecon ds and Ticks to convert time to
> milliseconds.
> Is this as accurate as using the QueryPerformanc eCounter?
>
> What is the resolution of Now in VB .NET?
>
> For example:
>
> Dim datEnd As Date
> Dim datStart As Date
>
> datStart = Now
> ' Do stuff here
> datEnd = Now
> MsgBox((datEnd. Ticks - datStart.Ticks) / 10000 & " milliseconds(Ti cks)" &
> vbCrLf & _
> datEnd.Subtract (datStart).Tota lMilliseconds.T oString() & "
> milliseconds(Su btract)")
>
> --
> http://www.standards.com/; See Howard Kaikow's web site.
>
>[/color]

[Jay B. Harlow [MVP - Outlook]]

Re: Most accurate timing in VB .NET??

Howard,
I normally use QueryPerformanc eCounter as I understand it has a sub
millisecond resolution. Plus it is the resolution of the PerformanceCoun ter
classes.

When Whidbey (VS.NET 2005) arrives we will have System.Diagnost ics.Stopwatch
class that you can use as a high resolution timer. I understand that it will
decides which is better (higher resolution) DateTime.Ticks or
QueryPerformanc eCount.

http://longhorn.msdn.microsoft.com/lhsdk/ref/ns/system.diagnostics/c/stopwatch/stopwatch.aspx

Remember the QueryPerformanc eFrequency function indicates what the
resolution of the QueryPerformanc eCounter function is. Ticks are at a fixed
resolution of 100-nanosecond, however I understand they may not be updated
every 100-nanoseconds...

Hope this helps
Jay

"Howard Kaikow" <kaikow@standar ds.com> wrote in message
news:uM3R5l4LEH A.128@TK2MSFTNG P09.phx.gbl...[color=blue]
> In VB, I've developed the habit of using the API QueryPerformanc eCounter[/color]
to[color=blue]
> achieve the most accurate timings.
>
> In VB .NET, one can use TotalMillisecon ds and Ticks to convert time to
> milliseconds.
> Is this as accurate as using the QueryPerformanc eCounter?
>
> What is the resolution of Now in VB .NET?
>
> For example:
>
> Dim datEnd As Date
> Dim datStart As Date
>
> datStart = Now
> ' Do stuff here
> datEnd = Now
> MsgBox((datEnd. Ticks - datStart.Ticks) / 10000 & " milliseconds(Ti cks)" &
> vbCrLf & _
> datEnd.Subtract (datStart).Tota lMilliseconds.T oString() & "
> milliseconds(Su btract)")
>
> --
> http://www.standards.com/; See Howard Kaikow's web site.
>
>[/color]

[Armin Zingler]

Re: Most accurate timing in VB .NET??

"Howard Kaikow" <kaikow@standar ds.com> schrieb[color=blue]
> In VB, I've developed the habit of using the API
> QueryPerformanc eCounter to achieve the most accurate timings.
>
> In VB .NET, one can use TotalMillisecon ds and Ticks to convert time
> to milliseconds.
> Is this as accurate as using the QueryPerformanc eCounter?
>
> What is the resolution of Now in VB .NET?
>
> For example:
>
> Dim datEnd As Date
> Dim datStart As Date
>
> datStart = Now
> ' Do stuff here
> datEnd = Now
> MsgBox((datEnd. Ticks - datStart.Ticks) / 10000 & "
> milliseconds(Ti cks)" & vbCrLf & _
> datEnd.Subtract (datStart).Tota lMilliseconds.T oString() & "
> milliseconds(Su btract)")[/color]

http://groups.google.com/groups?selm=%23Win1EbXDHA.2236%40TK2MSFTNGP10.phx.gbl

--
Armin

How to quote and why:

http://www.plig.net/nnq/nquote.html

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[Cor Ligthert]

Re: Most accurate timing in VB .NET??

Hi Howard,

I really do not know if it is accurate, however there is also an
enviroment.tick count which comes from the system timer

The problem is in my idea not the precise part, however in which way your
process has access to those timers continuly.

Maybe you can try that yourself.

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemenvironmentclasstickcounttopic.asp

Cor

[Herfried K. Wagner [MVP]]

Re: Most accurate timing in VB .NET??

* "Howard Kaikow" <kaikow@standar ds.com> scripsit:[color=blue]
> In VB .NET, one can use TotalMillisecon ds and Ticks to convert time to
> milliseconds.
> Is this as accurate as using the QueryPerformanc eCounter?[/color]

It isn't. I would still use 'QueryPerforman ceCounter', for example:

<URL:http://www.mentalis.or g/soft/class.qpx?id=8>

--
Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/>

[Howard Kaikow]

Re: Most accurate timing in VB .NET??

Thanx fer the responses.
I'll stick with the QueryPerformanc eCounter.

--
http://www.standards.com/; See Howard Kaikow's web site.
"Howard Kaikow" <kaikow@standar ds.com> wrote in message
news:uM3R5l4LEH A.128@TK2MSFTNG P09.phx.gbl...[color=blue]
> In VB, I've developed the habit of using the API QueryPerformanc eCounter[/color]
to[color=blue]
> achieve the most accurate timings.
>
> In VB .NET, one can use TotalMillisecon ds and Ticks to convert time to
> milliseconds.
> Is this as accurate as using the QueryPerformanc eCounter?
>
> What is the resolution of Now in VB .NET?
>
> For example:
>
> Dim datEnd As Date
> Dim datStart As Date
>
> datStart = Now
> ' Do stuff here
> datEnd = Now
> MsgBox((datEnd. Ticks - datStart.Ticks) / 10000 & " milliseconds(Ti cks)" &
> vbCrLf & _
> datEnd.Subtract (datStart).Tota lMilliseconds.T oString() & "
> milliseconds(Su btract)")
>
> --
> http://www.standards.com/; See Howard Kaikow's web site.
>
>[/color]

[Howard Kaikow]

Re: Most accurate timing in VB .NET??

Thanx fer the responses.
I'll stick with the QueryPerformanc eCounter.

--
http://www.standards.com/; See Howard Kaikow's web site.
"Howard Kaikow" <kaikow@standar ds.com> wrote in message
news:uM3R5l4LEH A.128@TK2MSFTNG P09.phx.gbl...[color=blue]
> In VB, I've developed the habit of using the API QueryPerformanc eCounter[/color]
to[color=blue]
> achieve the most accurate timings.
>
> In VB .NET, one can use TotalMillisecon ds and Ticks to convert time to
> milliseconds.
> Is this as accurate as using the QueryPerformanc eCounter?
>
> What is the resolution of Now in VB .NET?
>
> For example:
>
> Dim datEnd As Date
> Dim datStart As Date
>
> datStart = Now
> ' Do stuff here
> datEnd = Now
> MsgBox((datEnd. Ticks - datStart.Ticks) / 10000 & " milliseconds(Ti cks)" &
> vbCrLf & _
> datEnd.Subtract (datStart).Tota lMilliseconds.T oString() & "
> milliseconds(Su btract)")
>
> --
> http://www.standards.com/; See Howard Kaikow's web site.
>
>[/color]

[Howard Kaikow]

Re: Most accurate timing in VB .NET??

"Armin Zingler" <az.nospam@free net.de> wrote in message
news:4093bed4$2 $27042$9b622d9e @news.freenet.d e...[color=blue]
> "Howard Kaikow" <kaikow@standar ds.com> schrieb[color=green]
> > In VB, I've developed the habit of using the API
> > QueryPerformanc eCounter to achieve the most accurate timings.
> >
> > In VB .NET, one can use TotalMillisecon ds and Ticks to convert time
> > to milliseconds.
> > Is this as accurate as using the QueryPerformanc eCounter?
> >
> > What is the resolution of Now in VB .NET?
> >
> > For example:
> >
> > Dim datEnd As Date
> > Dim datStart As Date
> >
> > datStart = Now
> > ' Do stuff here
> > datEnd = Now
> > MsgBox((datEnd. Ticks - datStart.Ticks) / 10000 & "
> > milliseconds(Ti cks)" & vbCrLf & _
> > datEnd.Subtract (datStart).Tota lMilliseconds.T oString() & "
> > milliseconds(Su btract)")[/color]
>
>
>[/color]

http://groups.google.com/groups?selm=%23Win1EbXDHA.2236%40TK2MSFTNGP10.phx.gbl

The article uses

Win32.QueryPerf ormanceCounter( Counter)

Is there a .NET library that imports the API?
Where is the Win32 object defined?

[Howard Kaikow]

Re: Most accurate timing in VB .NET??

"Armin Zingler" <az.nospam@free net.de> wrote in message
news:4093bed4$2 $27042$9b622d9e @news.freenet.d e...[color=blue]
> "Howard Kaikow" <kaikow@standar ds.com> schrieb[color=green]
> > In VB, I've developed the habit of using the API
> > QueryPerformanc eCounter to achieve the most accurate timings.
> >
> > In VB .NET, one can use TotalMillisecon ds and Ticks to convert time
> > to milliseconds.
> > Is this as accurate as using the QueryPerformanc eCounter?
> >
> > What is the resolution of Now in VB .NET?
> >
> > For example:
> >
> > Dim datEnd As Date
> > Dim datStart As Date
> >
> > datStart = Now
> > ' Do stuff here
> > datEnd = Now
> > MsgBox((datEnd. Ticks - datStart.Ticks) / 10000 & "
> > milliseconds(Ti cks)" & vbCrLf & _
> > datEnd.Subtract (datStart).Tota lMilliseconds.T oString() & "
> > milliseconds(Su btract)")[/color]
>
>
>[/color]

http://groups.google.com/groups?selm=%23Win1EbXDHA.2236%40TK2MSFTNGP10.phx.gbl

The article uses

Win32.QueryPerf ormanceCounter( Counter)

Is there a .NET library that imports the API?
Where is the Win32 object defined?

[Armin Zingler]

Re: Most accurate timing in VB .NET??


"Howard Kaikow" <kaikow@standar ds.com> schrieb im Newsbeitrag news:%> >[color=blue]
>[/color]
http://groups.google.com/groups?selm...TNGP10.phx.gbl[color=blue]
>
> The article uses
>
> Win32.QueryPerf ormanceCounter( Counter)
>
> Is there a .NET library that imports the API?
> Where is the Win32 object defined?[/color]


No, sorry, I forgot them:

public notinheritable class Win32
Public Declare Auto Function QueryPerformanc eCounter _
Lib "kernel32.d ll" (ByRef Counter As Long) As Integer
Public Declare Auto Function QueryPerformanc eFrequency _
Lib "kernel32.d ll" (ByRef counter As Long) As Integer

private sub new
end sub
end class




--
Armin

How to quote and why:

http://www.plig.net/nnq/nquote.html

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[Armin Zingler]

Re: Most accurate timing in VB .NET??


"Howard Kaikow" <kaikow@standar ds.com> schrieb im Newsbeitrag news:%> >[color=blue]
>[/color]
http://groups.google.com/groups?selm...TNGP10.phx.gbl[color=blue]
>
> The article uses
>
> Win32.QueryPerf ormanceCounter( Counter)
>
> Is there a .NET library that imports the API?
> Where is the Win32 object defined?[/color]


No, sorry, I forgot them:

public notinheritable class Win32
Public Declare Auto Function QueryPerformanc eCounter _
Lib "kernel32.d ll" (ByRef Counter As Long) As Integer
Public Declare Auto Function QueryPerformanc eFrequency _
Lib "kernel32.d ll" (ByRef counter As Long) As Integer

private sub new
end sub
end class




--
Armin

How to quote and why:

http://www.plig.net/nnq/nquote.html

http://www.netmeister.org/news/learn2quote.html

[Howard Kaikow]

Re: Most accurate timing in VB .NET??

Thanx.

--
http://www.standards.com/; See Howard Kaikow's web site.
"Armin Zingler" <az.nospam@free net.de> wrote in message
news:40950172$0 $12458$9b622d9e @news.freenet.d e...[color=blue]
>
> "Howard Kaikow" <kaikow@standar ds.com> schrieb im Newsbeitrag news:%> >[color=green]
> >[/color]
>[/color]
http://groups.google.com/groups?selm...TNGP10.phx.gbl[color=blue][color=green]
> >
> > The article uses
> >
> > Win32.QueryPerf ormanceCounter( Counter)
> >
> > Is there a .NET library that imports the API?
> > Where is the Win32 object defined?[/color]
>
>
> No, sorry, I forgot them:
>
> public notinheritable class Win32
> Public Declare Auto Function QueryPerformanc eCounter _
> Lib "kernel32.d ll" (ByRef Counter As Long) As Integer
> Public Declare Auto Function QueryPerformanc eFrequency _
> Lib "kernel32.d ll" (ByRef counter As Long) As Integer
>
> private sub new
> end sub
> end class
>
>
>
>
> --
> Armin
>
> How to quote and why:
> http://www.plig.net/nnq/nquote.html
> http://www.netmeister.org/news/learn2quote.html
>[/color]

[Howard Kaikow]

Re: Most accurate timing in VB .NET??

Thanx.

--
http://www.standards.com/; See Howard Kaikow's web site.
"Armin Zingler" <az.nospam@free net.de> wrote in message
news:40950172$0 $12458$9b622d9e @news.freenet.d e...[color=blue]
>
> "Howard Kaikow" <kaikow@standar ds.com> schrieb im Newsbeitrag news:%> >[color=green]
> >[/color]
>[/color]
http://groups.google.com/groups?selm...TNGP10.phx.gbl[color=blue][color=green]
> >
> > The article uses
> >
> > Win32.QueryPerf ormanceCounter( Counter)
> >
> > Is there a .NET library that imports the API?
> > Where is the Win32 object defined?[/color]
>
>
> No, sorry, I forgot them:
>
> public notinheritable class Win32
> Public Declare Auto Function QueryPerformanc eCounter _
> Lib "kernel32.d ll" (ByRef Counter As Long) As Integer
> Public Declare Auto Function QueryPerformanc eFrequency _
> Lib "kernel32.d ll" (ByRef counter As Long) As Integer
>
> private sub new
> end sub
> end class
>
>
>
>
> --
> Armin
>
> How to quote and why:
> http://www.plig.net/nnq/nquote.html
> http://www.netmeister.org/news/learn2quote.html
>[/color]