Why Does C# Execute Math.Sqrt() More Slowly Than .NET
Jun 11, 2010
Background :While running benchmark tests this morning, my colleagues and I discovered some strange things concerning performance of C# code vs. VB.NET code.We started out comparing C# vs. Delphi Prism calculating prime numbers, and found that Prism was about 30% faster. I figured CodeGear optimized code more when generating IL (the exe was about twice as big as C#'s and had all sorts of different IL in it.)
I decided to write a test in VB.NET as well, assuming that Microsoft's compilers would end up writing essentially the same IL for each language. However, the result there was more shocking: the code ran more than three times slower on C# than VB with the same operation! The generated IL was different, but not extremely so, and I'm not good enough at reading it to understand the differences.
Benchmarks I've included the code for each below. On my machine, VB finds 348513 primes in about 6.36 seconds. C# finds the same number of primes in 21.76 seconds.
Computer Specs and Notes
Intel Core 2 Quad 6600 @ 2.4Ghz
Every machine I've tested on there is a noticeable difference in the benchmark results between C# and VB.NET.Both of the console applications were compiled in Release mode, but otherwise no project settings were changed from the defaults generated by Visual Studio 2008.
VB.NET code
Imports System.Diagnostics
Module Module1
Private temp As List(Of Int32)
Private sw As Stopwatch
[code]....
Why is C#'s execution of Math.Sqrt() slower than VB.NET?
View 8 Replies
ADVERTISEMENT
Mar 5, 2012
well i am having a couple of issues with this particular homework problem and this is my first programming class so there is probably quite a few mistakes well the homework problem is to take three double values entered by a user and display the largest and smallest using math.max and math.min and display the smallest and largest so i thought i could use a listbox and take the values that went to the listbox and assign variables to each so i can try to use each variable in the math.max and min but im not making it to far and i actually might be way off
[Code]...
View 4 Replies
May 1, 2011
I enter a valid picture path run this code and get error in the sqrt line
CODE:
How to fix ?
View 2 Replies
Sep 23, 2010
I got every other operation button to work besides sqrt, and percentage. I've done the same thing for addition, subtraction, etc. and it doesn't seem to work.
here's my globals
Public Class Form1
Private first As Double
Private second As Double
Private oper As String
[code]....
View 2 Replies
Dec 25, 2009
I've create my program before in Windowx XP ir required 1:37 seconds to finish the Genetic Algorithm but after I moved to Windows 7 64 bit and trying to used the 64 bits compiled version it runs much more slowly, it could take 5 minutes more, I've tried to change to 32 bit compiled version it run more faster than 64 bits but still slower than Windows XP it takes about 2:01. Is there something I missed in the compiling for 64 bits, or maybe the VS 2008 still not compatible with Windows 7.
View 3 Replies
Dec 16, 2010
what i want to do is have a richtextbox lets say this is the text
1
2
3
4
[Code].....
and i what i want to do is have a timer and have it scroll down line by line so each letter gets show and some letters go off the richtextbox cuz its small
View 3 Replies
Apr 25, 2009
I'm trying to query a remote machine and get the cpu percentage similar to task manager.. I have the following code:
Code:
im wmiK As New WMI
Private objMgmt As ManagementObject
[code].....
View 10 Replies
Jul 1, 2010
So in this program that I've made, I have 5 tabs. One of them uses this chart control for .NET ver 3.5 that I downloaded from the Microsoft website. The issue is, though, that when I start the program, everything is fine until I click on the tab with the 3 charts on it. The tab freezes a little bit, and it takes a few seconds to load the charts. After this initial hiccup everything is fine, but I've tested this on three computers now and it happens to all of them. Anyone know what I can do to make these charts load faster or smoother? This is quite a roadblock.because otherwise I'd be done I've been working on this project in VB.NET for the past 3 weeks and it's my first time using the language. So far every single one of my questions on here has been answered and all within a day or two
View 5 Replies
Dec 17, 2009
I am working with serial port communications. I have very fast and continuous data on my serial port. I have a program to read data from serial port. I have comport.Datareceived event in my program to receive data. Now, the problem is there is data going every 100ms to comport. Will my comport.DataReceived event will receive also with that fast? Now,let's say there is data on comport and if I don't read it what happens to the data? The problem I'm facing is my dataReceived event is getting very slow after some time.If I stop sending data to my com, still my datareceiving program is receiving. That means it is not as fast as sending data.If I keep sending data from 4 to 5 days and coz my datareceived event is not that fast as sending, I am getting data very slowly and some times I am getting MemoryOutofRange Exception.
View 1 Replies
Sep 12, 2011
just wondering if its possible to fade out a picturebox slowly after it has been clicked?
View 4 Replies
Jan 18, 2009
i have a .txt file containing 27,607 words, 1 per line, and i need my program to slowly read through and put it into a textbox/label. It only needs to read in order, not randomly or anything. It needs 2 be slow enough that I can read every word being shown, and if possible it would be nice to be able to change the speed but it is not needed.
Public Class Form1
Dim FILE_NAME As String = "C:My DocumentsWordList.txt"
Dim objReader As New System.IO.StreamReader(FILE_NAME)
[code]....
This is what i tried and all this does is displays 2 words in the middle of the file, then form goes white for about 5 seconds and then the last word in the file shows up and the program remains white. When i try with a txtbox only the last word is displayed.
View 3 Replies
Apr 30, 2012
I have a website(asp.net) which displays ssrs reports. Howevery everytime that I try to run the report from the website it takes about 2 min to load, but if I click on the report again , it will load up in seconds. I have tried to run a query that is used by the report and I get the results in second as well.
Is there any configuaration that I need to change or any tsql code that I need to add?
I have gone through to solutions provided here on stackoverflow but still had no luck.
View 1 Replies
Jun 29, 2011
I created a program that has 11 threads running simultaneously.Each thread runs a stopwatch and measures the amount of time that passes between the Start and Stop.There is no code between the start and stop, so most often, the result is 0 milliseconds.I noticed that INITIALLY, after a few minutes, the program would slow and the output to the RichTextBox would become disjointed.So, every two minutes, I have a timer execute and end the threads and restart them all.This seemed to help, however, after about an hour and a half, the program becomes more sluggish, evident in the stopwatches recording more instances over 0 milliseconds.Does this have to do with 'garbage collection' and is that even possible in VB .NET (I thought C only had that), or perhaps memory management?
View 1 Replies
May 4, 2010
I need to have a small window to appear slowly from the bottom of windows.is it a windows manipulation or it can be done in VB.net too.
View 10 Replies
Jun 29, 2011
I am porting VB.Net 2 code (VS 2005) to VB.Net 4 (VS 2010). So far things have been going relatively smooth. However, in testing my new ported code, I came across a strange behavior. In VS 2005 (.Net 2), I have a DataTable filled with data. I then use a DataAdapter to send updates back to the SQL Server. When I perform the qlClient.SqlDataAdapter.Update() command, it execute in roughly 4 seconds. The same code,on the same table in VS 2010 (.Net 4) runs in 1 Minute 17 Seconds. This is completely unacceptable. However, I have no clue as to why it is happening. The .Update() method is an internal command, not one that I modified in any way. It does not error out, it's just painfully slow.
View 1 Replies
May 22, 2010
Why is it that any project I make in VB.NET runs very slowly? Even if I simply add a TabControl, switching between tabs runs slowly, flashes the control white, etc. Is there a way to make it run smoother?
View 35 Replies
Jul 21, 2009
i try to use this yesterday it work fine..now, it will process too slow.. when fill the dataadapter into the dataset..here is the code it gives 20 menutes still no result.. "no error, no comment. it's like standby
Dim conn1 As MySqlConnection = New MySqlConnection("server=pc1;user id=user;Password=12345;persist security info=True;database=mytsmobile")
conn1.Open()
[code]....
View 2 Replies
Dec 17, 2009
I have a form with about 50 controls on it. labels, check boxes, combo boxes. text boxes and so on. Now I have a image on the back ground of the form and have made the checkbox text with transparent back ground so the picture can show through. the problem is that it is so slow to load. I see each one appearing on the form one by one. I have tried this on multiple machines and it does it on all of them. I have tried making the checkboxes not transparent but it still is slow.
how can I allow the form to load completely before it displays it. This is the initial form that loads and shows up.
View 3 Replies
Aug 17, 2004
I've been developing a progam at work and for some reason I set the TransparencyKey of my main form to a color rather than transparent.I left it and didn't even think about it until I noticed that the form had a delay when redrawing. All the controls are black boxes for a split second. See attachment.
I never noticed it before but the computers we use here at work aren't made for graphics. They've got various GHz speed celerons and integrated video cards.
I don't need the TransparencyKey in this program so it's not really an issue for me. I was just wondering if anyone knew why it's redrawing so slowly. What is .NET doing when drawing the form?
View 8 Replies
Aug 17, 2010
Is it possible to slowly Increment a progress bar to 100 and then return the value back to zero. I was thinking of using a timer but i'm not sure were to start.
View 7 Replies
Feb 25, 2010
[Code]...
how can i get this code to return all values instead of just the first value ?
View 30 Replies
Aug 20, 2009
I,m developing a debt calculation program 'my problem is when i have to calculate the months to pay back the debt it comes to 28.04 and i have to get it to 29 my code looks like this:
[Code]...
View 3 Replies
Mar 29, 2012
How can I round 4.39 to 5 in VB.NET? I tried:
Math.Round(4.39, 0)
But it displays 4.
View 1 Replies
Jan 27, 2012
I am trying to perform a simple multiplication in vb.
Below is my code:
Dim minus As Integer
Dim minusPrice As Integer
Dim totalPrice As Integer
[Code].....
View 4 Replies
Jul 29, 2011
I've been having a problem with Math.Log in a function I'm trying to write. When working with variables, it always returns 0. Here's the line I'm trying to run:
Quote:
mb = txtMb.Text
k = txtK.Text
t = txtT.Text
[Code].....
View 5 Replies
May 8, 2009
I am trying to use Math.round. now my math.round (2.5) converting it to 2. O want to convert it to 3.
View 6 Replies
Apr 13, 2012
I am trying to do math (-, +, *, etc) based on what a user selects from a combo box. The combo has the operators (-, +, *, /) in its items list. when the user selects one of them, I want to use that operator with the two numbers the user also provides from two text boxes.
dim intNumOne as integer
dim intNumTwo as integer
dim intAnswer as integer
[Code]....
'I don't think I want to concatenate here. but this is what I would like to happen (use the operator based on the users selection from the combo and the two numbers from the text boxes. I know I could write a select case or If statement but is there a way to do what I'm trying to do without Select Case or If? I tried to make theOperator a 'char' type variable but that didn't work either.
View 3 Replies
Sep 20, 2009
Is there any way to parse a string in vb.net (like, built in methods), that can do math like Eval can? For example, 3+(7/3.5) as a string would return 2.
I am not asking for you to code this for me, I just want to know if there is a built in way to do this, if there is not I will code it myself.
I can wager that it would not be able to parse stuff like Sin(90) on its own, and I understand that would need to be replaced by Math.Sin(90).
View 5 Replies
Oct 29, 2009
I have tried following coding to get highest value.EX: If I type 4.341111111111, It should get the value 4.35. If I type 9.132222, It should be 9.14 not 9.13.[code]
View 9 Replies
Nov 24, 2010
I am building a tool to figure out final value fees. This is the math i have to try to code
$1,000.01 or more 8.75% of the initial $50.00, plus 4.0% of the next $50.01 - $1,000.00, plus 2.0% of the remaining final sale price balance ($1,000.01 - final sale price)
View 8 Replies
