Follow the code I have to check the performance
double a = r.Next(9)*1e307 ;
DateTime d = DateTime.Now;
double b = Math.Pow(a,1/(double)100);
TimeSpan tm = DateTime.Now - d;
Console.WriteLi ne("{0}---{1}",b,tm.Ticks );
The return value is 0 Ticks - IT CAN NOT BE !!! What is the problem?
--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us " 16  1687 
Tamir Khason <ta**********@t con-NOSPAM.co.il> wrote: Follow the code I have to check the performance
double a = r.Next(9)*1e307 ;
DateTime d = DateTime.Now;
double b = Math.Pow(a,1/(double)100);
TimeSpan tm = DateTime.Now - d;
Console.WriteLi ne("{0}---{1}",b,tm.Ticks );
The return value is 0 Ticks - IT CAN NOT BE !!! What is the problem?
The problem is that it's taking less time than the granularity of the
timer. Do the operation a million times, time that, and then divide by
a million.
--
Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Thank you this works, however how it is possible to count such small
operations without multiplexing them?
--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "
"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com... Tamir Khason <ta**********@t con-NOSPAM.co.il> wrote: Follow the code I have to check the performance
double a = r.Next(9)*1e307 ;
DateTime d = DateTime.Now;
double b = Math.Pow(a,1/(double)100);
TimeSpan tm = DateTime.Now - d;
Console.WriteLi ne("{0}---{1}",b,tm.Ticks );
The return value is 0 Ticks - IT CAN NOT BE !!! What is the problem?
The problem is that it's taking less time than the granularity of the
timer. Do the operation a million times, time that, and then divide by
a million.
--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Tamir Khason <ta**********@t con-NOSPAM.co.il> wrote: Thank you this works, however how it is possible to count such small
operations without multiplexing them?
Well, there's the high resolution performance counter, documented in
various places (I don't have a link to hand) - but to be honest, that's
going to be influenced significantly by other things, such as what else
is happening on the computer at the time. Timing a single very fast
operation is generally a bad idea.
--
Jon Skeet - <sk***@pobox.co m> http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Thank you ;) But this what the client wants ;)
--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "
"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com... Tamir Khason <ta**********@t con-NOSPAM.co.il> wrote: Thank you this works, however how it is possible to count such small
operations without multiplexing them?
Well, there's the high resolution performance counter, documented in
various places (I don't have a link to hand) - but to be honest, that's
going to be influenced significantly by other things, such as what else
is happening on the computer at the time. Timing a single very fast
operation is generally a bad idea.
--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Accumulating a million measures and than dividing by million will give an
average time of the operation - which is much more meaningful from my point
of view.
Otherwise, using the high-resolution timer is the only option, but the
results will indeed vary depending on CPU usage. The reason is quite
simple - Windows is not a real-time OS by design.
--
Sincerely,
Dmitriy Lapshin [C# / .NET MVP]
Bring the power of unit testing to the VS .NET IDE today! http://www.x-unity.net/teststudio.aspx
"Tamir Khason" <ta**********@t con-NOSPAM.co.il> wrote in message
news:uO******** ******@TK2MSFTN GP14.phx.gbl... Thank you ;) But this what the client wants ;)
--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "
"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com... Tamir Khason <ta**********@t con-NOSPAM.co.il> wrote: Thank you this works, however how it is possible to count such small
operations without multiplexing them?
Well, there's the high resolution performance counter, documented in
various places (I don't have a link to hand) - but to be honest, that's
going to be influenced significantly by other things, such as what else
is happening on the computer at the time. Timing a single very fast
operation is generally a bad idea.
--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
That's the point. My client want to make benchmark of simplest math
calculations on vary platforms. Thus the solution of accumulation is not
suitable for him. I begun to override win32 and kernel for those
calculations. Maybe there is better approach...
--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "
"Dmitriy Lapshin [C# / .NET MVP]" <x-****@no-spam-please.hotpop.c om> wrote
in message news:eD******** ******@TK2MSFTN GP15.phx.gbl... Accumulating a million measures and than dividing by million will give an
average time of the operation - which is much more meaningful from my
point of view.
Otherwise, using the high-resolution timer is the only option, but the
results will indeed vary depending on CPU usage. The reason is quite
simple - Windows is not a real-time OS by design.
--
Sincerely,
Dmitriy Lapshin [C# / .NET MVP]
Bring the power of unit testing to the VS .NET IDE today!
http://www.x-unity.net/teststudio.aspx
"Tamir Khason" <ta**********@t con-NOSPAM.co.il> wrote in message
news:uO******** ******@TK2MSFTN GP14.phx.gbl... Thank you ;) But this what the client wants ;)
--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "
"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com... Tamir Khason <ta**********@t con-NOSPAM.co.il> wrote:
Thank you this works, however how it is possible to count such small
operations without multiplexing them?
Well, there's the high resolution performance counter, documented in
various places (I don't have a link to hand) - but to be honest, that's
going to be influenced significantly by other things, such as what else
is happening on the computer at the time. Timing a single very fast
operation is generally a bad idea.
--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
Tamir,
In that case, I think you need to have a face to face with your client
about the nature of the OS, processors, and why this isn't feasible.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m
"Tamir Khason" <ta**********@t con-NOSPAM.co.il> wrote in message
news:OI******** ******@TK2MSFTN GP11.phx.gbl... That's the point. My client want to make benchmark of simplest math
calculations on vary platforms. Thus the solution of accumulation is not
suitable for him. I begun to override win32 and kernel for those
calculations. Maybe there is better approach...
--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "
"Dmitriy Lapshin [C# / .NET MVP]" <x-****@no-spam-please.hotpop.c om> wrote
in message news:eD******** ******@TK2MSFTN GP15.phx.gbl... Accumulating a million measures and than dividing by million will give an
average time of the operation - which is much more meaningful from my
point of view.
Otherwise, using the high-resolution timer is the only option, but the
results will indeed vary depending on CPU usage. The reason is quite
simple - Windows is not a real-time OS by design.
--
Sincerely,
Dmitriy Lapshin [C# / .NET MVP]
Bring the power of unit testing to the VS .NET IDE today!
http://www.x-unity.net/teststudio.aspx
"Tamir Khason" <ta**********@t con-NOSPAM.co.il> wrote in message
news:uO******** ******@TK2MSFTN GP14.phx.gbl... Thank you ;) But this what the client wants ;)
--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "
"Jon Skeet [C# MVP]" <sk***@pobox.co m> wrote in message
news:MP******** *************** *@msnews.micros oft.com...
Tamir Khason <ta**********@t con-NOSPAM.co.il> wrote:
> Thank you this works, however how it is possible to count such small
> operations without multiplexing them?
Well, there's the high resolution performance counter, documented in
various places (I don't have a link to hand) - but to be honest, that's
going to be influenced significantly by other things, such as what else
is happening on the computer at the time. Timing a single very fast
operation is generally a bad idea.
--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too
By the way, Jon Skeet is correct: timing a single short operation produces
meaningless data. You must loop in an operation that takes a few 10s of
milliseconds, minimum, to obtain anything useful, and even that is fairly
meaningless unless your CPU is running a single process (impossible). So
plan on looping a thousand times for your little operation, and then loop
that loop 10 or 20 times, getting the elapsed time each time, then look at
the average of those times, possibly excluding the first loop.
At least the performance counter does produce accurate data. TimeSpan is not
accurate.
Regards,
Frank Hileman
check out VG.net: http://www.vgdotnet.com
Animated vector graphics system
Integrated Visual Studio .NET graphics editor
"Tamir Khason" <ta**********@t con-NOSPAM.co.il> wrote in message
news:e9******** ******@tk2msftn gp13.phx.gbl... Follow the code I have to check the performance
double a = r.Next(9)*1e307 ;
DateTime d = DateTime.Now;
double b = Math.Pow(a,1/(double)100);
TimeSpan tm = DateTime.Now - d;
Console.WriteLi ne("{0}---{1}",b,tm.Ticks );
The return value is 0 Ticks - IT CAN NOT BE !!! What is the problem?
--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "
Frank,
The performance counter doesn't either produce accurate data, the
granularity of the high performance timer is still an issue when timing
short operations.
Willy.
"Frank Hileman" <fr******@no.sp amming.prodiges oftware.com> wrote in message
news:OU******** ******@TK2MSFTN GP10.phx.gbl... By the way, Jon Skeet is correct: timing a single short operation produces
meaningless data. You must loop in an operation that takes a few 10s of
milliseconds, minimum, to obtain anything useful, and even that is fairly
meaningless unless your CPU is running a single process (impossible). So
plan on looping a thousand times for your little operation, and then loop
that loop 10 or 20 times, getting the elapsed time each time, then look at
the average of those times, possibly excluding the first loop.
At least the performance counter does produce accurate data. TimeSpan is
not accurate.
Regards,
Frank Hileman
check out VG.net: http://www.vgdotnet.com
Animated vector graphics system
Integrated Visual Studio .NET graphics editor
"Tamir Khason" <ta**********@t con-NOSPAM.co.il> wrote in message
news:e9******** ******@tk2msftn gp13.phx.gbl... Follow the code I have to check the performance
double a = r.Next(9)*1e307 ;
DateTime d = DateTime.Now;
double b = Math.Pow(a,1/(double)100);
TimeSpan tm = DateTime.Now - d;
Console.WriteLi ne("{0}---{1}",b,tm.Ticks );
The return value is 0 Ticks - IT CAN NOT BE !!! What is the problem?
--
Tamir Khason
You want dot.NET? Just ask:
"Please, www.dotnet.us "
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