VS 2008 Kernel Memory - Getting Information From OS By Using Performance Counters
Jan 21, 2010
I've been trying to get memory information from the OS by using Performance Counters. Memory performance information is available from the memory manager through the system performance counters. Right now, I'm working on getting the different types of Kernel Memory, but I'm having issues getting others as well. Through Performance Counters, I've been able to get Paged Virtual and Nonpaged Kernel memory.
The article I mentioned above does not explain how to get the Paged Physical Kernel Memory. It only gives the two I mentioned and the total, which is just the two combine and isn't the Paged Physical. The information isn't straight forward, so I'm using a third party application to compare my results so that I get the correct information. The article gives me Pool Paged Bytes Kernel memory and I found out that it is the Paged Virtual Memory.
I'm declaring this and others like so: [Code] I've researched several other methods, but I can't seem to get anywhere with anything else besides Performance Counters. To sum it up, I'm looking for a method to obtain the Paged Physical Kernel Memory.
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Sep 23, 2010
I am trying to setup performance counters for CPU Usage and Memory Used.I would like a progress bar and a label to display the percentage.I have the below code and although it seems to be half working, there is something just not right.. The memory one seems to be working fine although the CPU one is acting strange.
[Code]...
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Sep 23, 2010
I am trying to setup performance counters for CPU Usage and Memory Used.I would like a progress bar and a label to display the percentage.I have the below code and although it seems to be half working, there is something just not right.. The memory one seems to be working fine although the CPU one is acting strange.
Shared perfTotalMemory As New ComputerInfo
Shared perfFreeMemory As New PerformanceCounter("Memory", "Available MBytes")
Shared perfProcessorTime As New PerformanceCounter("Processor", "% Processor Time", "_Total")
[code]....
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Jun 23, 2011
My first try was to init performance counters in an array, which didnt work. Then I read up on performance counters and from that reading, the constructors are such that performance counters cannot be put in arrays. What does one do for multiprocessing?
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Jul 23, 2009
I'm trying to weave a .NET performance counter into an application. When I call the incrementBy(value) method on my avg performance counter it is changing the RawValue of my base counter by value as well. I checked the variable names and think everything is correct. Then when I call increment() on my base counter it adds 1 to the rawvalue of the avgcounter as well as incrementing the base counter... adding insult to injury!
In code I'm using two different counters to measure the time a merge sort I wrote takes. I have a instantaneous counter for the elapsed time of the sort and an average counter.
Dim timePiece As New Stopwatch()
timePiece.Start()
MergeSort()
timePiece.Stop()
[Code] .....
I think I may be using the counters wrong, but why does changing the rawvalue of the average seem to also change the rawvalue of the base? i dont think that's supposed to happen.
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Oct 25, 2011
Which is less resource-intensive (per se):
> Add controls/components (such as Performance Counters, Timers, etc.) to a project by dragging them onto the form and using them by setting the properties and using code to program what they do.
> Add controls/components (such as Performance Counters, Timers, etc.) to a project by using Dim x As New Performance Counter or Dim y As New Timer in code without actually dragging them from the Toolbox onto the bar at the bottom (under the Form Design).Or is there another way to do this that uses less CPU/RAM/Resources/etc.?
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Jan 29, 2011
I have an application (i've been working on for a long time) that has many tabs and controls and quite a few components And a good deal of design code. And a list box that has around 100k items (i had to put a loader to pass the 3-4 seconds while its loading to prevent it from not-responding)I had a few Gc.collect calls in specific places (mostly after many items are added or removed). When my application loads, i call GC.collect only once at the end of the load. The program consumes around 35K memory by the time its loaded. However, i decided to mess around abit (don't worry i made backups)First i started putting gc.collect in some random places, and to my surprise the memory upon loading was observably decreasing. Then I went ahead and put a macro that puts GC.Collect before every End Sub, Exit Function, Exit Sub, and Return value, there is. Basically every block in my application had atleat one GC.Collect.
I fixed some 6 or 7 silly replace errors and compiled. When the program launched, the memory used at the end of launch was 21K!
At first glance that seemed great, but then i realized switching between tabs was VERY glitchy. and adding new lists took around 10x more time than usual (the loader stayed on for around 20 seconds!) And even though the memory looked good, the program was useless like this.Then i decided to mess around differently. I removed GC.Collect from the entire solution. It was no longer called even once.At first glance, when i launched the app it consumed just under 60K memory. That seemed terrible. However i realized something: even though my program in that state showed on taskmanager that it was consuming alot more memory than usual, it seemed like it was lighter than ever! Switching tabs was faster than before, especially every time i go to the tab that has the listbox control with 100k items. Loading items took around 3-4 seconds, but there was no stutter when the list finished loading whereas before it had an evident 0.3s stutter after the items were added.
This was all surprising to me because i thought GC.Collect was first of all, something that it doesnt matter where or how many times you call it. I thought it was just something that should be called at the end of work and i didnt think it would matter if it was called during work.Second of all, i thought GC.Collect only affected resources that are inaccessible, or resources my program is done with. How come the application feels faster when i don't call it?Third of all, i thought the VB CLR does most of the memory cleaning for me, and that GC.Collect was somewhat of a redundant command. It didn't seem so redundant to me at all considering the difference between using it heavily and not using it at all was around 38K in memory usage!
So i guess my questions are:
1) Do I need to call GC.Collect? WhereWhen do i call it?2) Why does calling it affect performance? And where does one draw the line between that memory stat on taskmanager and the program's performance?3) I also decided to run a small test. Why does a blank vb form application require 10K memory? How accurate is that stat shown on the task manager?
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Mar 3, 2010
I have a Flash Calculator made for specific calculations. I can't extract values automatically, because it doesn't allow copy and paste. However, I know handler and address for those values, how can I get them in to my program?
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Dec 8, 2010
I am reading from a log file.My target is to display the 10 most popular requested URL's of a website.One way to do this is to read all log entries and save each URL to a Dictionary. The dictionary has the URL as the Key and the number of visits as the Value. If a URL exists in the dictionary the Value of that URL's Key is increased +1, otherwise a new Key/Value pair is added with a value of 1.
Once the processing is finished the dictionary is sorted by Value and the top 10 entries are shown.This might work, however it could cause a serious memory problem when dealing with a log file of a website which has thousands of different page url's (think query strings).Since I only need the top 10 entries, is there a way to avoid placing all the URL's into memory and still get the top 10 URL + Visits count?
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Nov 8, 2011
a) Dim strName as string
For i=0 to 100
strName=GetName()
do something with strname
Next
b) For i=0 to 100
Dim strName as string=GetName()
do something with strname
Next
Out of a and b which will be faster and consume less memory
Public sub GetResourceAttributes()
Dim colreSource as object
.using the colresource
colresource=nothing
end sub
Is sentencing'colresource =nothing'is good programming technique or is it enough to leave nothing done on 'colresource'. Like GC will take care of 'colresource' when there is no reference to the object.
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Jun 10, 2011
This is my code that im working on
[Code]...
I want to add in textbox2.text and a button when i press button1 (it minus the number or whatever number i deside to put into textbox2.text) then the time (in textbox1.text ) goes back up to 100
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Mar 29, 2012
I have a problem listing directory information in a process I wrote to call directory listing of the $MFT routine.The gang has convinced me that the problem is that I'm not calling the routine in Kernel Mode.How does one call a routine in Kernel Mode besides using pinvoke which is slow...."MODERN PROGRAMMING is deficient in elementary ways BECAUSE of problems INTRODUCED by MODERN PROGRAMMING." Me?
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May 27, 2009
I cannot use Visual Basic 2008 at all. When I go to "new project" and choose "Windows Form Application" I get this error.I have tried multiple uninstall/reinstall with no result.A microsoft reply to this suggested that I needed: " .NET Framework 2.0 Service Pack 1 " I checked, and I did not have the .netframework 2.0 service Pack 1.
When I tried to download and install the above from Microsoft.com, the istaller said that "it was not allowsed" and I was not able to install the service pack 1.
I tried Uninstalling net framework 3.5, 3.0, 2.0 and then reinstalling .netframework 2.0 sevice pack 1; then reinstalling Visual basic 2008 express edition. At the reinstall of Visual basic 2008, .netframework 2.0 sevice pack 1 is unistalled by .net framework service pack 2.When I check the foruims for simiar problems, the formus are mostly for Visual basic 5.0, or other programs that I do not have.
Here is the programs I have installed:
Operating system: Windows XP
Microsoft .net framework 1.1
Microsoft .NET framwork 1.1 Hotfix(KB928366)
Microsoft .Net Framework 2.0 Service Pack 2
[code]....
All the security updates and hotfixes for Widows XP.
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Nov 9, 2010
I want to know: How can Windows 7 enter to user mode and initialize hardware and all other things without any kernel but with a boot loader only?
Download Genius Web Explorer , It's free.
Download Genius Desktop Clock , It's free.
Download Genius Wallpaper Changer , It's free.
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Oct 19, 2009
Hope everyones doing well, not sure about the new decor around here though..Anyways, i have some labels on my form im trying to use as counters for records in a SQL db. One works just fine, and yet another using an almost identical query is returning very odd figures. If theres 5 records on the db its counting that as 1, and setting the label so. If theres 10 its counting that as 2, if theres 15 its showing 3, and so on.
[Code]...
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Mar 18, 2009
I'm looking to list all available performance counters (on a server) in my app and allow the user to select what he/she wishes to monitor. Then when they have been selected, hit a button, and the counters will start monitoring.
From using Google so far I can monitor one counter but I'm looking to monitor several user-selected counters. I guess in short I might be looking to re-hash perfmon. Would I need an array or a Microsoft.VisualBasic.Collection?
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Sep 22, 2010
I am working in VB.Net and loading word documents into an RTB. Most of the files I'm loading are small 2 to 60KB and have no problems. Occasionally, I have files that are upwards of 11,000KB. It takes approximately 2 minutes to get these loaded into the control. Is there anything I can do to boost performance when loading these files?
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Nov 30, 2009
I'm not sure if I'm gonna feel like an idiot after posting this, but here goes . I have taken my first shot a writing a code generator. not too shabby for my first go round, but I already see some ways it can be vastly improved. Not there yet, however. One of the things this code generator does is pull text templates (MANY text templates! Over and OVER again!) from a project resource file. I have added them to the resource designer as linked text files.
Now, the way the generator is written, there can at times be a LOT of iteration (think writing property declarations for a Classs which represents a database entity, as well as the backing fields for those property declarations, etc.).
Is there any significant performance hit to repeatedly accessing a resource? I have looked around on msdn and this forum (and will continue to investigate), but I am hoping someone can give me some clarification.
I SUSPECT that use of a resource file means a trip to the Hard drive each time one accesses it . . . Right? It IS a FILE, linked by it's PATH, right? Due to it's having been designated as a project resource, id a resource file somehow "magially" made available in memory, so that the disk round trip is not necessary?
I suspect I should be retreiving popular resources into a persisted Class-level variable if I plan to use them often within a specific class scope, and at the method level if I plan to perform a significant number of iterations whihc require the resource within the method.
AM I on the right track, or is the resource retreival trivial? I am NOT concerned about milking maximum performance out of a generator tool; it is acceptable for this process to take a little time. However, I also don't want to be sloppy unecessarily.
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Mar 25, 2009
Stupid question, but how do I get access to this Explorer? To create a performance session for Windows client application:(1) Open the solution in the Visual Studio IDE. (2) On the Analyze menu, click Launch Performance Wizard.(3) From the Which of the following available targets would you like toprofile? drop-down list, select the name of the application that you wantto profile, and then click Next. You can add more binaries later
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Jun 24, 2010
I'm hoping someone can point me in a different direction. I'm copying files from one computer to another. Both are on the same switch connected at 1Gbps here's my problem:Using File.Copy with a list of files I can get an average transfer speed of ~60Mbps Using multiple background workers with a split list of files and File.Copy is slower Using the FileStream read/write method I get an average speed of ~55Mbps with a 8M buffer
What can I do to get a faster transfer rate? I'd be happy to hit 250Mbps over the LAN.
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Sep 15, 2009
this time im looking for a faster-than-fast way to read binary files into a string/buffer/whatever, like Delphi's BlockRead does.i need this for an application that checks a list of folders/files and looks for multiple files, and handles them according to specific criteria.
I know there are standard solutions for this, like DuplicateFileRemover (gotta love that sheep! ), but i need something custommade, coz i want to handle the duplicates automatically too, and im talking about GigaBytes of data i have to periodically clean out this way..So far, the algorithm i use to determine if 2 files are equal is this:
[Code]...
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Feb 8, 2011
I am putting together a performance monitor that will eventually be running as as service. What I want to know is if the data that is reported is what I actually want: [code]
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Mar 10, 2011
Not really asking for code, but I'm interested in knowing the basics of "thread performance".For example, you try to copy a bitmap in a pixel by pixel operation. (Is slow, but it is a nice example)
[code]...
This is, of course, very buggy and causes a lot of violation errors etc. But that doesn't matter right now. How come the multi-threading way is so much faster than the regular routine? Is the processor not running on full speed with the first code, and is it working harder on the second?I find it weird to see this type of "threading performance increase", as if every single thread gets their own piece of processor speed allocated like it is a new process
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Mar 25, 2009
Stupid question, but how do I get access to this Explorer? The says: To create a performance session for Windows client application:
(1) Open the solution in the Visual Studio IDE.
(2) On the <B>Analyze</B> menu, click <B>Launch Performance Wizard</B>.
(3) From the <B>Which of the following available targets would you like to profile?</B> drop-down list, select the name of the application that you want to profile, and then click <B>Next</B>. You can add more binaries later.
(4) Accept the default Sampling profiling method, and then click Next.
(5) Click <B>Finish</B>.
Only problem is that there is no <B>Analyze</B> menu in the IDE.
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Sep 15, 2010
I'm trying to measure the performance of seven sorting algorithms in a single VB 2008 program. I've tried using a Timer componend, the Stopwatch, and DateTime.Ticks but nothing works. The following simple code produces a result of about 500 (milliseconds), which is correct, but when I change 500 to 1000, I get a ridiculous result like 0 or 8.
[Code]...
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Nov 5, 2009
In VB 2005, I am calling a C++ DLL function that returns the address in memory and size in bytes of a jpeg image. How can I load that jpeg image directly from memory into a picture box in my VB form? I cannot afford to save it to disk first.
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May 22, 2007
Im getting a problem with one of my programs I have made in visual basic.NET where it gives me a memory error when i debug the program in the IDE. the exact error is this: "Attempted to read or write protected memory. This is often an indication that other memory is corrupt". My program basically has a few forms with text fields on that get their text values from an access database on the same hard drive. Im wondering if im doing something wrong because my program just seems to eat up memory whenever it does anything. For example I have one form that has a combobox on it and when you change the drop down list selection it retreives a few strings from the database and puts them into the relevant text boxes, if you keep changing the selection then the memory usage (in task manager) just keeps going up and up. occasionally I get the error mentioned above when debugging but in my built version of the program it throws an exception everytime the memory usage gets past 49K.
Also I noticed when debugging in the "immediate window" frame I get the following message often:A first chance exception of type 'System. Invalid OperationException' occurred in System.Data.dll...Do I need to somehow be "releasing" the memory that is used to gather data once it becomes redundant?
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Nov 24, 2011
I am using the following code
This error occurs :
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
Public Class FormRegEnumValue
[CODE]......................
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Feb 1, 2009
QuoteSystem.AccessViolationException was unhandled Message="Attempted to read or write protected memory. This is often an indication that other memory is corrupt." Source="System.Windows.Forms"
Im designing a web browser and i continue to receive this error after going to about 3 websites it crashes with that error.
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Jan 20, 2010
I have a BackgroundWorker object that I instantiated to perform a DB process on a background thread ansynchronously. I have event handlers for DoWork and RunWorkerCompleted. I can tell that the BackgroundWorker is disposing of itself because I added a message box into the Disposed event handler.Is it necessary to detach the event handlers to ensure that the memory is cleaned up and that there are not memory leaks?
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