What does ""VM Thread" prio=5 tid=0x17b178 nid=0x2 runnable" do ?

When I take the thread dump of a java process, I am getting the
"VM Thread" prio=5 tid=0x17b178 nid=0x2 runnable
in the thread dump. But no stack for this thread.
Does anyone knows what does this "VM Thread" do ?
I have a situation where the java process is taking 50% of the CPU power and when I use prstat -L to get the thread wise CPU usahe the "VM Thread" is taking 25% CPU. Anyone knows what could be the reason for this "VM Thread" to take 25% of CPU power ?
If anyone knows what task the "VM Thread" does, please share it.
Thanks in advance.

Hi
There are no thread dump for native VM threads. Which jvm are u using?
You must be using a 4 -CPU Solaris sparc box? When u encounter the high CPU, can u do a pstack 3 times 5 seconds apart? Note if thread# 2 changes.
I cant recall off hand what to look out for but u shld see if there is GC happening there. unfortunately, pstack give mangled trace, so there is no easy way to tell. I have to go back office n check it tomorrow. then again, no promise cos i seldom login :p
My guess is that ur GC is running when high CPU is encountered. If u r running 1.4.2_x, add -XX:+PrintGC -XX:+PrintHeapAtGC -XX:+PrintGCDetails. You may also consider -XX:+UseConcMarkSweepGC -XX:+UseParNewGC or
-XX:+UseParallelGC
But, they may result in higher CPU cos they have more threads doing collection.

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What does it mean to be "thread safe"?

What does it mean to be "thread safe"?
I am working with a team on a project here at work. Someone here suggested that we build all of our screens during the initialization of the application to save time later. During the use of the application, the screens would then be made visible or invisible.
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To understand why Swing is not thread safe you have to understand a little bit of history, and a little bit of how swing actually works. The history(short version) is that it is nearly impossible to make a GUI toolkit thread safe. X is thread safe(well, sorta) and it's a really big mess. So to keep things simple(and fast) Swing was developed with an event model. The swing components themselves are not thread safe, but if you always change them with an event on the event queue, you will never have a problem. Basically, there is a Thread always running with any GUI program. It's called the awt event handler. When ever an event happens, it goes on an event queue and the event handler picks them off one by one and tells the correct components about it. If you have code that you want to manipulate swing components, and you are not ON the awt thread(inside a listener trail) you must use this code.
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What does knowing the number of "views" tell us about a thread.

10 Points to the person who can give a cogent, rational, non-apologetic answer to the questions posed below, which are based on the premiss set forth just before it. (Please feel free, if you see fit, to dispute the premiss).
PREMISS:
People might "look" at a thread for a whole host of reasons -- whether it be to read the thread and contribute, or just to lurk, or because the thread's title was ambiguous, or funny, or in some other way remarkable apart from any substantive value it may have, or, even, just by accident, because the person clicked on the wrong button and inadvertently "looked" at the thread for a nanosecond before exiting. And probably for other reasons as well.....
QUESTION:
In light of the foregoing, what does knowing the number of "views" tell us other than what it says, i.e., does it tell us anything apart from the number of people that have for whatever reason literally just taken a look at the thread?
If the answer to the above question is nothing -- i.e., the number of "views" tells us just that, the number of "views" and nothing more -- then why is this information so prominently featured, instead of, say, the information that used to be present under the old Discussions system, such as the number of unread posts in a particular thread, which is data that actually has a value as something other than a statistic. Knowing the number of unread posts indicates to someone following a particular thread, whether there has been additional contributions to the thread that should be reviewed if one is to remain current on the substance of that particular discussion. The extent of the additional contributions (if any) are readily apparent from the count).
The little, difficult-to-discern-on-my-PowerBook's-screen tiny blue dot can hardly be said to take the place of the unread post count, as it shows the same indicator for one new post as it does for ten or even a hundred.
Thanks for your help with this.

Hi Scott --
Thanks for your thoughtful reply. It did help, and I've even marked it "helpful" under the new, bizarre point system to evidence this fact. (BTW, my "offer" of a point award was more a misplaced attempt at sardonic humor aimed at deriding the new point system, with which I have a number of strong disagreements, than it was an effort to bribe thoughtful replies like yours. Please know that I really do appreciate the time and effort you took to get back to me on this and meant no disrespect by the "reward" point bounty).
That said, I do have one follow up. You write that "the idea behind this [use of "views" rather than number of posts unread] is that even discounting curiosity, boredom, funny title, et al., the number of folks that have looked at a thread should bear some relation to the number of folks who are having that issue."
I just don't think that that's the case. I don't think it sufficently discounts curiosity, boredom, funny title, et al. Those are some pretty powerful motivations for people to peruse this site. And there are many, many others as well.
Of course I can only speak with certainty of my own personal experience with the Discussions, but based on that, I know have "viewed" numerous threads on subject matters that not only wasn't I experiencing, but on subject matters that I couldn't possibly experience,because it concerned Mac hardware or software that I don't own or have never used.
In some cases, I looked at threads where the subject line sounded interesting, or amusing, or provocative, in other cases I looked at threads that concerned hardware or software that I once owned (and so I thought I might be able to help with the problem at issue), in still other cases the thread concerned software and/or hardware that I was considering purchasing (and wanted to know what I might be getting into). With regard to the former of those two reasons, I know there were many, many instances where, based on the title of the post, I knew that I could help and I viewed the post as a form of oversight (so to speak) to make sure that the responses being left were providing accurate and complete information.
In my "view," though clearly not in the "view" of the Mods, et al. for reasons (thanks to your post) that I can at least better articulate (if not understand or agree with), a thread's number of "views" is susceptible to just too many possible meanings to make it of any real use. The number of unread posts (and by this I refer to the old numeric value of posts not yet read and not that illegible little blue dot used in the new system) may not be perfect information, but it is certainly more useful in my "view" than the number of "views." (I apologize for those poor puns on the word "view," but in my "view" they were unavoidable, sort of. See what I mean
Anyway. I really do thank you for your reply and the time and effort you took to make it. But, alas, with each hour I use these New Discussions, the more convinced I become that my continued time on here is fading. With no more hope of leveling up, with even less hope of ever receiving any tangible sign of "thanks for your help" in the form of + votes (insignificant as they were, at least they were something, everyone like to feel appreciated), with the posts much more difficult to read on my PowerBook's screen and even more difficult to keep track of, and for a bunch of other reasons (some admittedly petty, and some that strike at the core of why and how I use this site), I fear that I will soon be saying farewell.
But till then, thanks once again for your thoughtful reply.

What does this mean:Photoshop 13.1.2 for Creative Cloud Installation failed. Error Code: U44M1P7

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http://www.adobe.com/support/downloads/thankyou.jsp?ftpID=5595&fileID= 5604

Hi Barbara,
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What does the open file dialog do 'under the hood' and is there a way to simulate it

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I have a bug in my code (that I've posted about before, here) which I can't fix at the moment, but I do have a workaround.
Briefly, the bug:
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I have to do this everytime I turn the PC on.
So, either
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or
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Dave

Hi David
I am very conscious about thread hijacking but this sounded like my issue so I hope you dont mind me asking about your issue. I am hoping that you have a spectrometer from the same vendor as me and its not just me seeing an Error 1097 issue. My spectrometer is from a company called Stellarnet.
So far I have unable to get it to work with other VIs. There is one condition where I can get it to work but its no good for me.
Case 1
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Case 2
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Case 3
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I wanted to share what I have seen with you and to let you know that maybe somebody else has the same issue. I am convinced its the DLL but the vendor dis-agreed saying it was LabVIEW. I couldn't convince him otherwise.
Thanks in advance
David

I shop for for apps on my ipod touch and when i plug my ipod into itunes and it says erase and sync what does that mean?

hello all,
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What does this error message mean? "An unexpected error occurred (error code -6584). It arises when I open my Time Capsule icon.

I had a problem when downloading iTunes 11.1 and had to clear my disc and rebuild it from Time Capsule. Thats when I learned that Time Capsule stopped backing up back in January. So now I keep looking to see if Time Capsule is backing up but whenever I open the Time Capsule icon i get this error message. What does it mean and how can I fix the problem?

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Perfect? No. But hey, thanks for what does wo

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Are you looking for this Thread that you started...
https://discussions.apple.com/message/25004385#25004385
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I apologize if this is sent twice. I don't see it on the forum anymore, and I really need an answer.
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In the MS-DOS prompt when I try to run the appletviewer, I get:
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load: class HelloWorld.class not found.
java.lang.ClassNotFoundException: HelloWorld.class
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:151)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.applet.AppletClassLoader.loadClass(AppletClassLoader.java:112)
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at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:478)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:548)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:477)
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at java.lang.Thread.run(Thread.java:536)
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at sun.applet.AppletClassLoader.getBytes(AppletClassLoader.java:224)
at sun.applet.AppletClassLoader.access$100(AppletClassLoader.java:40)
at sun.applet.AppletClassLoader$1.run(AppletClassLoader.java:141)
at java.security.AccessController.doPrivileged(Native Method)
at sun.applet.AppletClassLoader.findClass(AppletClassLoader.java:138)
... 8 more
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Can you post the HTML that calls for the applet?

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Take a look at the following post on the subject:
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1. SIGN ( I or E - Inclusive or Exculsive)
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as exclusive of the option.
etc.
hope this is clear.
AND PLEASE CLOSE THE OTHER THREAD (duplicate)

HT1766 Hello I am trying to update my viber, as i pressed update icon the message appeared "This update is not available for this Apple ID either because it was bought by a different user or the item was refunded or camcelled" what does it mean

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It means Apple have done a lousy job with Lion or ML and TC networking.
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What does ""VM Thread" prio=5 tid=0x17b178 nid=0x2 runnable" do ?

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