速度vc ++与c ++构建器 [英] speed vc++ vs. c++builder
问题描述
您好，
我是一个视觉c ++和borland c ++构建器新手。
i有一个简单的mandelbrot算法，并用两者编译它/>
vc ++（mfc）和cbuilder（vcl）（除了绘图部分之外的相同代码）。
vc ++版本是两次！在发布模式下快速。在调试模式下它的价格和cbuilder一样快。似乎我不能让cbuilder编译一个真正的
发布版本。当我检查项目选项：编译器：发布时它
甚至比调试慢！我使用
高级编译器选项玩了一下而没有任何结果。我也放弃了
绘图部分，假设它会以某种方式导致减速。 cbuilder
版本并不比delphi 7上的相同代码快（可能是相同的
问题）。我能做什么？我不相信cbuilder（和delphi）比vc ++慢得多。我认为这只是找到
正确的编译器选项的问题。
谢谢。
代码：
for（y = 0; y< ymax; y ++）
{
for（x = 0; x< xmax ; x ++）
{
cox = x * xscale + leftside;
coy = y * yscale + top;
zx = 0;
zy = 0;
colorcounter = 0;
betrq = 0;
zaehler = 0;
while（colorcounter< maxiter&& betrq< bailout）
{
tempx = zx * zx-zy * zy + cox;
zy = 2 * zx * zy + coy;
zx = tempx;
colorcounter = colorcounter + 1;
betrq = zx * zx + zy * zy;
}
if（betrq< bailout）/ *在x处绘制黑色像素，y * /;
else / *在x，y * /）处绘制白色像素;
}
}
系统：
vc ++：visual studio 6.0
c ++ builder 6 enterprise
windows xp home sp1
intel pentium m（centrino）1400mhz
" PDQBach" < PO ***** @ freenet.de>写了...我是一个视觉c ++和borland c ++ builder newbie。
我已经找到了一个简单的mandelbrot算法，并使用
vc ++（mfc）和cbuilder进行编译（vcl）（除了绘图部分之外的相同代码）。
vc ++版本是两次！在发布模式下快速。在调试模式下它的速度和cbuilder一样快。似乎我不能让cbuilder编译一个真正的
发布版本。当我检查项目选项：编译器：发布时它甚至比调试慢！我使用
高级编译器选项玩了一下而没有任何结果。我也放弃了
绘图部分，假设它会以某种方式导致减速。 cbuilder
版本并不比delphi 7上的相同代码快（可能是相同的问题）。我能做什么？我不相信cbuilder（和delphi）比vc ++慢得多。我认为它只是找到正确的编译器选项的问题。
对。要解决它，你需要发布到C ++ Builder新闻组
而不是C ++语言。你没有_language_问题。
正如你所确定的那样，你的问题在于找到合适的
编译器选项。试试borland.public.cppbuilder。*层次结构。
Victor
po ***** @ freenet.de （PDQBach）在留言新闻中写道：< 6f ****************** ********@posting.google。 com> ...你好，
我是一个视觉c ++和borland c ++ builder newbie。
我已经找到了一个简单的mandelbrot算法并用它编译
vc ++（mfc）和cbuilder（vcl）（除了绘图部分之外的相同代码）。
vc ++版本是两次！在发布模式下快速。在调试模式下它的速度和cbuilder一样快。
这是偏离主题的，但这是相当典型的 - 作为一般规则，
Borland编译器优化相对较差。通过一些工作，你可以在某种程度上提高它的价值，但是它有可能会保持一定的价格，但是b / b
后来，
杰瑞。
-
宇宙是自己想象的虚构。
对不起蜂场。谢谢你的回答。
<但是很有可能它会保持有点慢。
我的呼叫速度不会快两倍。我更喜欢使用bcb来轻松使用
，但这种差异是不可接受的。我得到的结果与
相同：
#include" stdafx.h"
#include< time .h>
#include< conio.h>
#include< iostream>
using namespace std;
void main（）{
clock_t beg;
double j;
beg = clock（）;
for（double i = 0; i< 200000000; ++ i）j = i * 1000000;
int dif = clock（） - beg;
cout<< dif<< endl;
getch（）;
我认为没有什么可以优化的？怎么不能bcb优化器搞砸了？b $ b这么简单的东西？ （对不起继续留言）
Hello,
im a visual c++ und borland c++builder newbie.
i have witten a simple mandelbrot algorithm and compiled it with both
vc++ (mfc) and cbuilder (vcl) (same code besides the drawing part).
the vc++ version is twice! as fast in release mode. in debug mode its
as fast as cbuilder. it seems i cant get cbuilder to compile a real
release version. when i check "Project options:compiler:release" it
even gets slower than debug! i have played around a bit with the
advanced compiler options without any result. i also dropped the
drawing part, supposing that it causes slowdown somehow. the cbuilder
version is not faster than the same code on delphi 7 (maybe the same
problem). what can i do? i cant believe cbuilder (and delphi) to be
that much slower than vc++. i think its just a problem of finding the
right compiler options.
thank you.
code:
for (y=0;y<ymax;y++)
{
for (x=0;x<xmax;x++)
{
cox=x*xscale+leftside;
coy=y*yscale+top;
zx=0;
zy=0;
colorcounter=0;
betrq=0;
zaehler=0;
while (colorcounter<maxiter && betrq<bailout)
{
tempx=zx*zx-zy*zy+cox;
zy=2*zx*zy+coy;
zx=tempx;
colorcounter=colorcounter+1;
betrq=zx*zx+zy*zy;
}
if (betrq<bailout) /*draw black pixel at x,y*/;
else /*draw white pixel at x,y*/);
}
}
system:
vc++: visual studio 6.0
c++builder 6 enterprise
windows xp home sp1
intel pentium m (centrino) 1400mhz
"PDQBach" <po*****@freenet.de> wrote...im a visual c++ und borland c++builder newbie.
i have witten a simple mandelbrot algorithm and compiled it with both
vc++ (mfc) and cbuilder (vcl) (same code besides the drawing part).
the vc++ version is twice! as fast in release mode. in debug mode its
as fast as cbuilder. it seems i cant get cbuilder to compile a real
release version. when i check "Project options:compiler:release" it
even gets slower than debug! i have played around a bit with the
advanced compiler options without any result. i also dropped the
drawing part, supposing that it causes slowdown somehow. the cbuilder
version is not faster than the same code on delphi 7 (maybe the same
problem). what can i do? i cant believe cbuilder (and delphi) to be
that much slower than vc++. i think its just a problem of finding the
right compiler options.
Right. And to solve it you need to post to the C++ Builder newsgroup
instead of C++ language one. You don''t have a _language_ problem.
Your problem, as you so precisely determined, is in finding the right
compiler options. Try borland.public.cppbuilder.* hierarchy.
Victor
po*****@freenet.de (PDQBach) wrote in message news:<6f**************************@posting.google. com>...Hello,
im a visual c++ und borland c++builder newbie.
i have witten a simple mandelbrot algorithm and compiled it with both
vc++ (mfc) and cbuilder (vcl) (same code besides the drawing part).
the vc++ version is twice! as fast in release mode. in debug mode its
as fast as cbuilder.
It''s off-topic, but this is fairly typical -- as a general rule,
Borland compilers optimize relatively poorly. With some work, you can
probably improve it somewhat, but chances are it''ll remain somewhat
slower anyway.
Later,
Jerry.
--
The universe is a figment of its own imagination.
Sorry for beeing offtopic. thanks for the answer.
<but chances are it''ll remain somewhat slower anyway.
i wouldnt call twice as fast somewhat. i prefer bcb for the ease of
use but such differences are inacceptable. i get the same results with
the following:
#include "stdafx.h"
#include <time.h>
#include <conio.h>
#include <iostream>
using namespace std;
void main() {
clock_t beg;
double j;
beg = clock();
for (double i=0; i<200000000; ++i) j = i*1000000;
int dif = clock()-beg;
cout << dif << endl;
getch();
i think theres nothing to optimize? how cant bcb optimizer screw up
such simple things? (sorry for continuing an offtopic thread)
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