Why do threaded applications speed vary at runtime?

I have 1 thread for a breakout game that i have created besides the main of that class that starts the thread. When I run the game, it sometimes seems to run slower or faster than other times. Why is this?

There are many different reasons this could happen such as
- disk latency.
- network latency
- GC of objects.
- the load on the machine.
It is highly unlikely to have anything to do with using more than one thread.

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Why can't you use PipedXputStream in other than threaded application

I have need for usage of these in a non-threaded application, however the Javadoc indicate this should not be done.
"Attempting to use both objects from a single thread is not recommended, as it may deadlock the thread."
As the Java community is composed of some brilliant people, I am curious as to why any limitation of this sort has not been fixed/addressed?
What is the root cause of these deadlock situations?
Thanks in advance.
Steve

899559 wrote:
I have need for usage of these in a non-threaded application, however the Javadoc indicate this should not be done.Because using streams in a single thread makes no sense, since you can just use method calls. And that avoids the situation were you could be trying to write more than the stream buffer can hold or trying to read more than you wrote to the stream.
data = getData();
outPipe.write(data);
data = inPipe.read();
doSomethingWith(data);
// is just a roundabout way of coding
doSomethingWith(getData());

Why do I get this error message: Application has requested the runtime to terminate?

I get this error message: Application has requested the runtime to terminate in an unusual way. The application won't open at all even after several tries and a reboot.

Try making a direct desktop icon for the Editor and see if you can launch the program directly from the desktop.
Right click anywhere on the desktop and select New >> Shortcut
Browse to Computer OS C:
And find the PSE Editor application in Program Files or Program Files (x86) on Windows 7 - 64 bit.
C: >> Program Files >> Adobe >> Photoshop Elements 9
Within the Photoshop elements 9 folder find PhotoshopElementsEditor.exe (with the blue icon)
Select that file and click Next.
Then click Finish.
You should now be able to launch by double clicking on the new desktop icon, bypassing the welcome screen.

Multi-threaded application crashing the VM

Hi,
I have a multi-threaded (about 120 threads) application which crashes without after running for a while.
I get this in the windows event viewer
Faulting application java.exe, version 0.0.0.0, faulting module kernel32.dll, version 5.2.3790.0, fault address 0x000017b1.
Anyone knows why this would happen?
- vineet

Hi Alexis,
Thanks for the response to my post!!
Which version of the JVM?C:\>java -version
java version "1.4.2_05"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_05-b04)
Java HotSpot(TM) Client VM (build 1.4.2_05-b04, mixed mode)
Are you using the -server option?I was not using this option earlier but even on using this the jvm crashes after running for sometime.
I am using these jvm options now -
java -server -Xss128K -Xms256M -Xmx512M
- vineet

Why is the write speed so slow to my NAS

Hi, I am trying to improve the write speed from my MBP to the NAS. I am using the Thunderbolt ethernet adapter connected to an Airport Extreme 7.6.1 using a wired connection. I have a Synology DS213 with a wired connection to the Airport Extreme as well. I am using CAT6 cables.
In testing my performance, I noticed writing files from my MBP to the NAS was very slow; whereas my read performance was much better. Please see the tests below to explain this further.
Using the Blackmagicdesign Disk Speed Test Utility using a 5Gb test file written to the NAS, I see the following:
Write speed is 7 to 8MB/s This write speed is what concerns me.
Read speed is between 60 MB/s and 75 MB/s
Using 2 finder windows (drag a file from one window(MBP) to the other(NAS)) and watch the disk activity on the Activity Monitor with a 1Gb file
When writing a file to the NAS from the MBP:
Write speed will burst to 19 to 23 MB/s but it will drop to below 10 MB/s at times.
When writing a file to the MBP from the NAS
Write speed is: 46 to 60 MB/s
Why would the write speed from my MBP to the NAS be so slow ; whereas, the write speed from the NAS to the MBP is very fast.
Synology has 2 WB 'green' disks configured as raid 1. I understand that part of the influence of writing from the NAS to the MBP is utilzing the advantage of writing to a SSD ; whereas, writing to the NAS it is writing to a slower drive.
Is 19 to 23 MB/s burst with dips below 10 MB/s during a copy typical? The other thing is I dont understand why the Disk Speed Utility never records write speeds to the NAS over 10 MB/s whereas the Activity Monitor will show the bursts at times of 19 to 23 MB/s
If 7 to 8 MB/s write speeds is too slow, what can I look at to improve this? Since writing the file in the other direction is pretty fast considering, how could the issue be a network one?

I was transferring my iPhoto library from an older MBP to a new retina and having the same issue - transfers almost immediately slowing to less than 100k/sec over my beautiful Time Warner-provided WiFi router using regular OSX folder sharing. I couldn't find any software updates as some other similar threads suggested.
I put my iPhoto library in a .tar.gz archive and that immediately transfered at about 7mb/sec, much much faster! So, without having diagnosed the issue, perhaps I've uncovered evidence that one or both of my machines doesn't like transferring big file trees. I bet a zip or any other archive would do the trick.

Why does my application give SerializationException although I have no serialized classes?

I have created an application deployment tool for BizTalk, and it references and uses Microsoft.BizTalk.ExplorerOM apis to start, stop and manage a BizTalk application. Now when I run the tool, it gives following exception-
Unhandled Exception: System.Runtime.Serialization.SerializationException: Type 'Microsoft.BizTalk.ExplorerOM.BtsCatalogExplorer' in Assembly 'Microsoft.BizTalk.ExplorerOM, Version=3.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' is not marked as serializable.
None of my classes are defined to be serializable. And the tool is created in WPF. Any idea how I might resolve this?

Hi,
I think the user has got this resolved at stackoverflow already.
Why does my application give SerializationException although I have no serialized classes?
Resolution: He was creating the instance of BtsCatalogExplorer through reflection, using connection
string instead solves the issue.
Rachit
Please mark as answer or vote as helpful if my reply does

Como soluciono este problema: Runtime Error!... This application has resquested the Runtime to terminate it in an unusual way.

No puedo trabajar en photoshop, me envia una ventana con lo siguiente:
Runtime Error!... This application has resquested the Runtime to terminate it in an unusual way.
Y se cierra el programa, como puedo resolver el problema, es adobe phothosop elements 7 en windows vista.

This problem can have many different causes, so the steps to solve can vary / be complex.
Firstly, have you installed any non-Microsoft programs recently?
If so, this could be the cause of the errors, try to uninstall the programs.
Some other discussions (rather complex), which suggest that Explorer-extensions can be the cause of this:
http://social.technet.microsoft.com/Forums/en-US/bf414bb1-8c48-4114-874f-341cc7d8db68/explorerexe-crashes-with-c4343-runtime-error-during-file-search?forum=w7itproperf
http://social.technet.microsoft.com/Forums/en-US/3a6e2cfe-ef5b-4547-a832-946a3cc82e8e/microsoft-visual-c-runtime-library-runtime-error?forum=w7itproappcompat
Don
(Please take a moment to "Vote as Helpful" and/or "Mark as Answer", where applicable.
This helps the community, keeps the forums tidy, and recognises useful contributions. Thanks!)

Why think about Application virtualization before going to VDI or desktop virtualization

Hi Team,
I am new in ThinApp technology.
My question is that "Why think about Application virtualization before going to VDI or desktop virtualization."
Please help to clear my question.
Thanks
Yogesh

With Application Virtualization you'll make any transition easier. While the term isn't really clear to understand for anyone new to the technology I usually find it easier to explain by calling it Application Isolation/Redirection, which actually gives a clearer idea of what it is doing. What ThinApp (or any other Application Virtualization) does is catch calls the operating system does to the registry and files and reroute that to a single contained environment. With Application Virtualization you can deploy your applications without touching the other applications or operating system. The nice thing about ThinApp is that it's clientless so there is no need for any backend or client. The runtime is contained in the ThinApp, which is why you can even use multiple versions at the same time.
With VDI you try to consolidate resources and not buy 1000's of desktops every few years, because physical desktop migrations are a pain. You also try to make managing them easier because basically you'll only have to manage a single desktop (master image). But to get there you will have to do a migration, having Application Virtualization in place will make it an easy project instead of a hard one.
The second reason why you would want to do it is because with ThinApp there is no need to actually deploy the application to the VDI, they can be shown on the machine but actually run from a share or even dynamically mapped with virtual disks.

Error on installation of LabVIEW Run-Time Engine 8.5.1: "This application has requested the Runtime to terminate it in an unusual way"

Hi,
a colleague in India cannot install the LabVIEW Run-Time Engine 8.5.1 on Windows XP. On attempting to install, an error box is shown, which says:
(window title)
Microsoft Visual C++ Runtime library:
(message box text)
Runtime error!
Program: C:\National Instruments Downloads\LabVIEW 8.5.1\Runtime Engine\setup.exe
This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.
http://img529.imageshack.us/my.php?image=runtimeerrorvt7.jpg
I didn't find any relevant clues for this in NI forums. A search at Google brought me to http://support.microsoft.com/kb/884538/en-us, offering a HotFix to solve the problem. Unfortunately, the installation of this HotFix does not solve the problem.
Do you know this behavior and do you have any ideas how the problem can be solved?
Thanks in advance.
Best regards
Manuel
Message Edited by Manuel Häderle on 10-07-2008 10:41 AM
Solved!
Go to Solution.

Hi there
log in as administrator and kill all processes not needed and try again. I've seen cases where one of these free download tweak applications (like "Memory Defragmentation" and stuff like that) caused that error.
Best regards
chris
CL(A)Dly bending G-Force with LabVIEW
famous last words: "oh my god, it is full of stars!"

Photoshop elements 10 won't start. Message is. 'Runtime error. Application has requested the runtime to terminate in an unusual way. Please contact support team for more information' 'microsoft Visual C Runtime Library. How do I fix this or can I jus

photoshop elements 10 won't start. Message is. 'Runtime error. Application has requested the runtime to terminate in an unusual way. Please contact support team for more information' 'microsoft Visual C Runtime Library. How do I fix this or can I just uninstal and then re-instal (without losing my spare licence that I want to use elsewhere) It is a PC not a Mac

See if anything here helps:
Troubleshoot C++ runtime errors | Adobe products | Windows

AIR runtime and AIR applications built using Captive Runtime still need Admin Privilege to Install

I am working on a small project to install AIR application(native .exe & .dmg) with AIR runtime without needing the Administrator privilege so I used Captive runtime but the installation is still asking for admin privilege
I bundled AIR application with AIR runtime using Captive runtime from flash builder 4.6, then I packaged this into a .MSI using Advanced Installer. Now when I install it for a user without admin privilege it prompts me for Admin credentials.
Can you please tell me if
1. I need AIR distribution license to install AIR runtime without Admin privilege
2. Do I need a different installer
3. Am I missing any step here
Thank you

If you're installing to a location where Windows requires elevated privileges, like Program Files, you'll need to have admin privileges to continue. Are you using an AIR based native installer or have you taken the application with the captive runtime and rolled this up in your own installer?
Here's a section from the Installation and deployment options in Adobe AIR 3 article that might help:
Installation privileges
When designing an installer, one has the option to choose from approaches that may or may not require administrative privilege. For example, a drag-and-drop install on Mac OS X requires no special privilege; users can always copy the application into their own application folders, for which they have the necessary permissions. On the other hand, if registry keys must be written to the machine-specific portion of the registry on Windows, installation of that application will require administrative privilege to do so.
The two installer formats directly supported by AIR, AIR files and native installers, have always required administrative privilege. This was a design decision made in part to simplify the implementation of the AIR installers: If administrative privilege is assumed to be available, implementation is possible if the registry can be written to, and so on. It was also selected because, in many enterprises, this is the desired behavior: administrators can use the privilege requirement to gate software installation.
All the same, there are scenarios where supporting installation without requiring administrative privileges is desirable, or even necessary. This can now be achieved using custom installers; you simply need to author an installer that operates correctly with only standard user privilege. In practice this can be easy to achieve; a simple install-by-copy to a writable location (that is, in the user's own folder) will suffice. Should you author a more complex installer, you should keep in mind that the addition of certain operations during the install process will in turn reintroduce the requirement for administrative privileges.

Why do my applications all ungroup when I sync with itunes ?

why do my applications all ungroup when I sync with itunes ?
All I do is sync up and it just ungroups all my apps and spreads them over sevreal pages so after I have to spend ages and group them all back up again ?
Am I doing something wrong ?
Any help would be most appreciated.
Thansk
Nils

Jonatanfama wrote:
my question is
how long to charge the iPhone battery when it is new?
Some say it is 6 or more hours
thanks for the help
As I said, you won't hurt a lithium-ion battery by not fully charging it prior to use. These batteries don't have a "memory" like older nickel cadmium batteries do so it doesn't compromise it's ability to fully charge by using it with only a partial charge. You also can't overcharge it; your charger will go into "trickle" charge mode once it reaches about 95% charge and remain that way. If you want to wait to use it, charge it overnight. If you don't, just charge it for a couple of hours, the fully charge it once you don't need to use it for a while.

Why does Java Application not working with Macromedia Flash 5 or MX?

Why does Java Application not working with Macromedia Flash 5 or MX?

Who says they don't?
Although I don't know much about those I'd think they should be able to talk to Java Aps using Sockets or request Servlets ...
Spieler

Multi-Thread application and common data

I try to make a multi-Thread application. All the Threads will update some common data.
How could I access the variable �VALUE� with the Thread in the following code:
public class Demo {
private static long VALUE;
public Demo(long SvId) {
VALUE = 0;
public static class makeThread extends Thread {
public void run() {
VALUE++;
public static long getVALUE() {
return VALUE;
The goal is to get the �VALUE� updated by the Thread with �getVALUE()�
Thanks for your reply
Benoit

That code is so wrong in so many ways......
I know you're just experimenting here, learning what can and can't be done with Threads, but bad habits start early, and get harder to kick as time goes on. I am going to give a little explanation here about what's wrong, and what's right.. If you're going to do anything serious though, please, read some books, and don't pick up bad habits.
Alright, The "answer" code. You don't use Thread.sleep() to wait for Threads to finish. That's just silly, use the join() method. It blocks until the threads execution is done. So if you have a whole bunch of threads in an array, and you want to start them up, and then do something once they finish. Do this.
for(int k=0; k<threads.length; k++) {
threads[k].start();
for(int k=0; k<threads.length; k++) {
threads[k].join();
System.out.println("All Threads Done");Now that's the simple problem. No tears there.
On to the java memory model. Here where the eye water starts flowing. The program you have written is not guarenteed to do what you expect it to do, that is, increment VALUE some amount of time and then print it out. The program is not "Thread Safe".
Problem 1) - Atomic Operations and Synchronization
Incrementing a 'long' is not an atomic operation via the JVM spec, icrementing an int is, so if you change the type of VALUE to an int you don't have to worry about corruption here. If a long is required, or any method with more then one operation that must complete without another thread entering. Then you must learn how to use the synchronized keyword.
Problem 2) - Visiblity
To get at this problem you have to understand low level computing terms. The variable VALUE will NOT be written out to main memory every time you increment it. It will be stored in the CPUs cache. If you have more then one CPU, and different CPUs get those threads you are starting up, one CPU won't know what the other is doing. You get memory overwrites, and nothing you expect. If you solve problem 1 by using a synchronized block, you also solve problem 2, because updating a variable under a lock will cause full visiblity of the change. However, there is another keyword in java.. "volatile".. A field modified with this keyword will always have it's changes visible.
This is a very short explaination, barely scratching the surface. I won't even go into performance issues here. If you want to know more. Here's the resources.
Doug Lea's book
http://java.sun.com/docs/books/cp/
Doug Lea's Site
http://g.cs.oswego.edu
-Spinoza

Why are the application in the apple store are not compatible with the iPod touch 4g? Apple please realize there are some of us who still have the iPod touch 4g!

Why are the application in the apple store are not compatible with the iPod touch 4g? Apple please realize there are some of us who still have the iPod touch 4g! I just want to know.

Once I find the game i will truly screenshot that it states "not compatible for these models". I just find it RIDICULOUS that my iPod touch is in good condition and some of the applications that I want download sometimes are not compatible with my iPod touch 4g. I am not going to buy an ipod 5th generation if my 4g is still going strong since the year of 2010.

Why do threaded applications speed vary at runtime?

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