对于数学，C＃与C ++的速度差异为30％？ [英] 30% difference in speedof C# vs C++ for math?
问题描述
我正在考虑使用C＃来开发一个科学应用程序，但是我已经注意到在同一台机器上VC ++ .NET和C＃之间有30％的差异，
下相同条件：
double a = 0，b = 0，c = 0，d = 0，e = 0;
for（int n = 0 ; n！= 6000000; n ++）
{
a = n％5 * 2/3 - 4 + 6/3 - n + n * 2;
b = n * 2.3 - 1 * 2/3 - 4 + 6/3 - n + n * 2;
c = n * 3 / 3.5 * 2/3 - 4 + 6 / 3 - n + n * 2;
d = n + 1 * 2 * 2/3 - 4 + 6/3 - n + n * 2;
e = n / 2 * 2/3 - 4 + 6/3 - n + n * 2;
}
VB.NET需要2300ms，C＃需要1000ms VC ++中只有700ms
这听起来不错吗？
谢谢。
Richard
你是否在发布版本中构建了？
你是否在构建过程中打开了优化参数？
VC ++代码是原生的还是托管的？
所有这些都会影响性能。
< re ***** @ gmail。 COM>在消息中写道
news：11 ********************** @ f14g2000cwb.googlegr oups.com ...你是否在发布版本中构建了？
你是否在构建过程中打开了优化参数？
是VC ++代码本机还是托管？
所有这些都将影响性能。
1.两者都在发布模式下运行（C＃和VC ++）。
2. VC ++程序已经过优化速度。我找不到类似的
选项C＃
3. VC ++代码是原生的。
有没有选项可以在编译的C＃应用程序中最大化速度？
Richard
理查德，
如果您需要这种速度，请购买数学组件（以及一个特定于您的应用程序类型的b $ b）并使用C＃开发GUI
和业务逻辑。这比用C ++写一切
更有意义。
最好的问候
Johann Blake
I was considering C# for developing a scientific application, but I have
noticed a ~30% difference between VC++ .NET and C# on the same machine,
under identical conditions:
double a = 0,b = 0, c = 0, d = 0, e = 0;
for(int n = 0; n != 6000000; n++)
{
a = n % 5 *2 / 3 - 4 + 6 / 3 - n + n * 2;
b = n * 2.3 - 1 *2 / 3 - 4 + 6 / 3 - n + n * 2;
c = n * 3 / 3.5 *2 / 3 - 4 + 6 / 3 - n + n * 2;
d = n + 1 * 2 *2 / 3 - 4 + 6 / 3 - n + n * 2;
e = n / 2 *2 / 3 - 4 + 6 / 3 - n + n * 2;
}
It takes 2300ms in VB.NET, 1000ms in C# but only 700ms in VC++
Does this sound right?
Thanks.
Richard
did you build in release version?
did you open the optimizing parameter in the building process?
is the VC++ code native or managed?
all of these will affect the performance.
<re*****@gmail.com> wrote in message
news:11**********************@f14g2000cwb.googlegr oups.com...did you build in release version?
did you open the optimizing parameter in the building process?
is the VC++ code native or managed?
all of these will affect the performance.
1. Both were run in Release mode (C# and VC++).
2. The VC++ program was optimized for speed. I could not find a similar
option for C#
3. The VC++ code is native.
Is there an option to maximize speed in a compiled C# application?
Richard
Richard,
If you need that kind of speed, buy a math component (and one
particular to your type of application) and use C# to develop the GUI
and business logic. That makes far more sense than writing everything
in C++.
Best Regards
Johann Blake
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