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why vb code faster than csharp???

why vb code faster than csharp???# Programming - 葵花宝典

s*12008-09-13 07:09

1 楼

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e*r2008-09-13 07:09

2 楼

Anybody can tell why vb.net codes for looping is faster than Csharp?

s*o2008-09-13 07:09

3 楼

How do you know that vb.net is faster than C# for looping?

v*n2008-09-13 07:09

4 楼

it's possible that VB compiler does more optimization than C# compiler

【在 e*****r 的大作中提到】

: Anybody can tell why vb.net codes for looping is faster than Csharp?

a*l2008-09-13 07:09

5 楼

it's much more possible that LZ just mistakenly thought vb is faster. VB,
especially after VB6, is based on .net framework, so its code is not much
different from C# code.

【在 v******n 的大作中提到】

: it's possible that VB compiler does more optimization than C# compiler

e*r2008-09-13 07:09

6 楼

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Timers;
using System.IO;
namespace My_Speed_Test
{
class Program
{
static void Main(string[] args)
{
DateTime tic = DateTime.Now;
UInt32 d=200;
double dd = 200;
int s = 0;
for (int a=1;a<=10000;a++)
{
for (int b=1;b<=10000;b++)
{
for (int c=1;c<=10;c++)

e*r2008-09-13 07:09

7 楼

Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles Button1.Click
Dim a, b, c, s As Integer
s = 0
Dim d As Integer
d = 250
Dim dd As Double
dd = 250
Dim tic, toc As String
tic = (Now().Millisecond) / 1000 + Now().Second + (Now().Minute) *
60
For a = 1 To 10000
For b = 1 To 10000
For c = 1 To 10
dd = dd * 5.1234567

e*r2008-09-13 07:09

8 楼

above are C# codes and vb.net codes respectively(both compiled by vs.net 2008 Express):
In my laptop, results for speed testing:
Matlab:
ver 7.1: limit of array size overlimit for 1E4*1e4*1e1 size, has to
change to loop format 20x for loop
Total time: 38.01second
VB.net: total loop 1e9 (1 billion)
total time: 18.64 second
VSharp.net:
total time:21.5 second!!!
netSDK_CSC:
total time: 21.625 second!!!
Python 2.5:
10000x1000x10 loops with For-Loop (it's a very special one!)

e*r2008-09-13 07:09

9 楼

It can't be interpreted simply by "overhead" costs (>3 second difference
between vb.net and C# codes), since there is no overhead (to my
understanding) between the two. CIL codes for both C# and VB.net should be
the same for both, aren't they?
I have been expecting vb.net "FOR loop" will be slower than that of C# due to
some overhead costs, but instead! no!

c*t2008-09-13 07:09

10 楼

why not use exactly same init and format for both VB.NET and C#?

to

【在 e*****r 的大作中提到】

: It can't be interpreted simply by "overhead" costs (>3 second difference
: between vb.net and C# codes), since there is no overhead (to my
: understanding) between the two. CIL codes for both C# and VB.net should be
: the same for both, aren't they?
: I have been expecting vb.net "FOR loop" will be slower than that of C# due to
: some overhead costs, but instead! no!