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C++/CLI the fastest compiler? Yes, at least for me. :-)

Ok, so I posted a rant earlier about the lack of marketing for C++/CLI,
and it forked over into another rant about which was the faster
compiler. Some said C# was just as fast as C++/CLI, whereas others said
C++/CLI was more optimized.

Anyway, I wrote up some very simple test code, and at least on my
computer C++/CLI came out the fastest. Here's the sample code, and just
for good measure I wrote one in java, and it was the slowest! ;-) Also,
I did no optimizing compiler switches and compiled the C++/CLI with
/clr:safe only to compile to pure verifiable .net.

//C++/CLI code
using namespace System;

int main()
{
long start = Environment::Ti ckCount;
for (int i = 0; i < 10000000; ++i) {}
long end = Environment::Ti ckCount;
Console::WriteL ine(end - start);
}
//C# code
using System;

public class ForLoopTest
{
public static void Main(string[] args)
{
long start = Environment.Tic kCount;
for (int i =0;i < 10000000; ++i) {}
long end = Environment.Tic kCount;
Console.WriteLi ne((end-start));
}
}

//Java code
public class Performance
{
public static void main(String args[])
{
long start = System.currentT imeMillis();
for (int i=0; i < 10000000; ++i) {}
long end = System.currentT imeMillis();
System.out.prin tln(end-start);
}
}

Results:

C++/CLI -> 15-18 secs
C# -> 31-48 secs
Java -> 65-72 secs

I know, I know, these kind of test are not always foolproof, and results
can vary by computer to computer, but at least on my system, C++/CLI had
the fastest results.

Maybe C++/CLI is the most optimized compiler?

-Don Kim
Mar 12 '06
44 3238
This is very useful info. It was causing confusion given mixed
information coming from MSFT itself.

--------
Ajay Kalra
aj*******@yahoo .com

Mar 13 '06 #41

"Carl Daniel [VC++ MVP]" <cp************ *************** **@mvps.org.nos pam>
wrote in message news:%2******** ********@TK2MSF TNGP10.phx.gbl. ..
| "Willy Denoyette [MVP]" <wi************ *@telenet.be> wrote in message
| news:%2******** ********@TK2MSF TNGP11.phx.gbl. ..
| > Followup.
| > !!! Stopwatch.Elaps ed.Ticks != Stopwatch.Elaps edTicks !!!
|
| A ha! I obviously hadn't looked at the code closely enough to realize
that
| it was using Elapsed.Ticks and not ElapsedTicks.
|
| > One should not use Elapsed.Ticks to calculate the elapsed time in
| > nanoseconds.
|
| True - one should use it to calculate the elapsed time in 0.1us units,
since
| that's what TimeSpan.Ticks is expressed as.
|
| > The only correct way to get this high precision count is by using
| > Stopwatch.Elaps edTicks like this:
| >
| > long nanosecPerTick = (1000L*1000L*10 00L) / Stopwatch.Frequ ency;
|
| but make this a double. Stopwatch.Frequ ency is more than 1E9 on modern
| machines using the MP HAL.
|
| double nanosecPerTick = 1000.0 * 1000L * 1000L / Stopwatch.Frequ ency;
|
Sure, or use picoseconds :-)

long picosecPerTick = 1000L * 1000L * 1000L * 1000L / Stopwatch.Frequ ency;

90614831400 picoseconds
Looks real crazy isn't it?
Willy.


Mar 13 '06 #42

"Ajay Kalra" <aj*******@yaho o.com> wrote in message
news:11******** **************@ i40g2000cwc.goo glegroups.com.. .
| This is very useful info. It was causing confusion given mixed
| information coming from MSFT itself.
|
| --------
| Ajay Kalra
| aj*******@yahoo .com
|

Well, the C++/CLI team did not want to generate explicit sequence points in
the IL, so the JIT compiler can only rely on the implicit sequence points
(that is when the evaluation stack is empty). That means also that it's not
possible to synchronise the IL with the actual code while debugging C++/CLI
in managed mode and you need the PDB to set breakpoint in your code, not a
big deal IMO.
Willy.
Mar 13 '06 #43
"Willy Denoyette [MVP]" <wi************ *@telenet.be> wrote in message
news:Om******** ******@TK2MSFTN GP09.phx.gbl...
Sure, or use picoseconds :-)


Nah - that's short sighted. Let's standardize on Attoseconds :)

long attosecPerTick = 1000L * 1000L * 1000L * 1000L * 1000L * 1000L
/Stopwatch.Frequ ency;

now that's just getting silly... for the next few decades at least.

-cd
Mar 14 '06 #44

"Carl Daniel [VC++ MVP]" <cp************ *************** **@mvps.org.nos pam>
wrote in message news:OJ******** ******@tk2msftn gp13.phx.gbl...
| "Willy Denoyette [MVP]" <wi************ *@telenet.be> wrote in message
| news:Om******** ******@TK2MSFTN GP09.phx.gbl...
| > Sure, or use picoseconds :-)
|
| Nah - that's short sighted. Let's standardize on Attoseconds :)
|
| long attosecPerTick = 1000L * 1000L * 1000L * 1000L * 1000L * 1000L
| /Stopwatch.Frequ ency;
|
| now that's just getting silly... for the next few decades at least.
|
| -cd
|
|

LOL, I'll keep it in mind for a next life maybe :-)

Willy.
Mar 15 '06 #45

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