Mbean for Memory Usage

Hello!
I need to monitor programmatically the memory usage of the Tomcat server. Can I implement it via MBeans and if yes, which MBean should I use? Thanks.

Hi,
I do not think this is possible. What you can monitor with the java.lang MXBeans is the
JVM memory as seen by the garbage collector.
You can use tools like VisualVM to try to figure out where objects have been allocated,
if this is what you need.
http://visualvm.dev.java.net/
hope this helps,
-- daniel
http://blogs.sun.com/jmxetc

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What settings do y'all use for Memory Usage?

Application default is 100% and Still Cache is 10%.
I have seen diffeent theories on this and put my Apllication down to 80%. Now it seems I am getting an Out Of Memory message when doing haevy duty renders.
Ideas?
Thanks folks!

Buy more memory, Mark. It's cheap.
FCP can use a total of 4GB, but it assigns about 1.5GB for related processes it figures it needs, so the core application can then use up to 2.5GB. When you have 4GB or less, that means if you allow FCP to use 100%, the OS will have little or nothing left and will use Virtual Memory when the need arises, This in turn will impact FCP and cause Page Outs. That means your timeline will be playing from the hard drive.
So, if you have 4GB or less, set the FCP memory allowance to less than 100%. In your case, you apparantly don't have enough memory for your project's needs.
So, buy more RAM. It's cheap.

I have a huge problem with memory usage.

I am having two very huge problems with the amount of memory the game I'm working on is using. The first is that the background image for a part of my game takes up ~45mb of memory, but believe it or not, that's not my worst problem. i'm not worried about that right now.
The really, really big problem does involve that image, though.
Whn I'm done using the image, I can't get the resources it uses to be freed. As a result, the program uses more and more memory every time you go into that area of the game, because the memory used by tha area is just sitting there.
I used Jprofiler to figure out exactly what wasn't getting released, because I do everything I know how to make everything be garbage collected, including setting all the references to the image to null after you leave that area of the game, but nothing worked.
After I leave the area with the huge memory leak and give everything time to garbage collect, the main screen for memory usage shows about 45mb of memory used by 20 or so instances of int[], which is obviously the image.
However, this obscenely huge int array doesn't show up in the heap snapshot, which according to them means there's no reference to it or the image anywhere in the program.
Here's my question: If there's no reference anywhere to this int array, then why isn't it being garbage collected?

Maybe you haven't actually released all references to that data.
Or if you have one 45mb image, maybe you have a bunch of other huge ones and you're just seeing those.
Why do you have a 45mb background image, though? Can't you use a standard technique like tiling it?

Firefox becomes really slow then eventually unresponsive when loading a page with many hires images. Unsual high memory usage up to 2gigs just for firefox. Was never a problem with v3.6.

When loading a page with many hires images, Firefox becomes really slow and scrolling becomes jumpy then eventually becomes completely unresponsive. Unusual high memory usage of up to 2gigs just for firefox when loading these pages. This was never a problem with v3.6.

I encountered the same type of problem. Firefox running terribly slowly and slowing down my entire machine (Core i5 with 256GB SSD). Searching the forums, I found a couple of things about troubleshooting performance issues, one of which was to use '''hardware acceleration''', that is on by default. It was turned on on my PC, '''so I tried deactivating it, and it worked!'''
So doing the exact opposite as Mozilla support said solved the problem. It is really a pain now to work with Firefox. I'm using it because I have no choice, but I'd recommend IE and Chrome over Firefox... Whatever, the market will decide once Firefox has become to crappy...

How to specify maximum memory usage for Java VM in Tomcat?

Does any one know how to setup memory usage for Java VM, such as "-Xmx256m" parameter, in Tomcat?
I'm using Tomcat 3.x in Apache web server on Sun Solaris platform. I already tried to add the following line into tomcat.properties, like:
wrapper.bin.parameters=-Xmx512m
However, it seems to me that this doesn't work. So, how about if my servlet will consume a large amount of memory that exceeds the default 64M memory boundary of Java VM?
Any idea will be appreciated.
Haohua

With some help we found the fix. You have to set the -Xms and -Xmx at installation time when you install Tomcat 4.x as a service. Services do not read system variables. Go to the command prompt in windows, and in the directory where tomcat.exe resides, type "tomcat.exe /?". You will see jvm_options as part of the installation. Put the -Xms and -Xmx variables in the proper place during the install and it will work.
If you can't uninstall and reinstall, you can apply this registry hack that dfortae sent to me on another thread.
=-=-=-=-=-=
You can change the parameters in the Windows registry. If your service name is "Apache Tomcat" The location is:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Apache Tomcat\Parameters
Change the JVM Option Count value to the new value with the number of parameters it will now have. In my case, I added two parameters -Xms100m and -Xmx256m and it was 3 before so I bumped it to 5.
Then I created two more String values. I called the first one I added 'JVM Option Number 4' and the second 'JVM Option Number 5'. Then I set the value inside each. The first one I set to '-Xms100m' and the second I set to '-Xmx256m'. Then I restarted Tomcat and observed when I did big processing the memory limit was now 256 MB, so it worked. Hope this helps!
=-=-=-=-=
I tried this and it worked. I did not want to have to go through the whole reinstallation process, so this was best for me.
Thanks to all who helped on this.

Is there any Vi for getting the CPU and Memory usage of the Local as well as Remote System

Is there any Vi for getting the CPU and Memory usage of the Local as well as Remote System

Find the attachment(LV8.5) for local machines.
You can use shared variables to monitor the remote machine's usage.
Attachments:
Task Monitor 85.vi ‏25 KB

How to find out CPU and memory usage for an instance?

Hi DBA Gurus,
How to find out CPU usage and memory usage for an instance?
Any information is appreciated!
Thank you!
Robert

you can calculate cpu usage by adding fallowing three factors which you can get from v$sysstat
1. Parse CPU time : This represents the percentage of CPU time spent parsing SQL statements. Parse time CPU can be a strong indication that an application has not been well tuned. High parse time CPU usually indicates that the application may be spending too much time opening and closing cursors or is not using bind variables.
2. Recursive CPU time : Sometimes, to execute a SQL statement issued by a user, the Oracle Server must issue additional statements. Such statements are called recursive calls or recursive SQL statements. For example, if you insert a row into a table that does not have enough space to hold that row, the Oracle Server makes recursive calls to allocate the space dynamically if dictionary managed tablespaces are being used.
Recursive calls are also generated due to the inavailability of dictionary info in the dictionary cache, firing of database triggers, execution of DDL, execution of SQL within PL/SQL blocks, functions or stored procedures and enforcement of referential integrity constraints
3. Other CPU time : This represents the percentage of time spent looking for buffers, fetching rows or index keys, etc. Generally, \"Other\" CPU should represent the highest percentage of CPU time out of the total CPU time used.
total memory used you can calculate adding
total_agrigate_area+sga
memory usage on os level you can know by fallowing commands
vmstat 5 20 depending upon os

How to capture memory usage for web application

In OATS openscripts, how to capture memory usage for web application? Does it have the exisitng java method that we can call to get the memory data (e.g. peak bytes, private bytes) consumed by web application?

JProbe

What's the recommended setting for "Process memory usage" ("process virtual" in UI) for a 64-bit host on a 64-bit OS?

Hi gurus
In resource based throttling, what's the recommended setting for "Process memory usage" ("process virtual" in the resource based throttling tab of the UI) for a 64-bit host
on a 64-bit Windows OS?
According to MS (http://msdn.microsoft.com/en-us/library/ee308808(v=bts.10).aspx):
"By default, the
Process memory usage throttling threshold is set to 25. If this value is exceeded and the BizTalk process memory usage is more than 300 MB, a throttling condition may occur. On a 32-bit
server, you can increase the Process memory usage value to 50. On a 64-bit server, you can increase this value to 100. This allows for more memory consumption by the BizTalk process before throttling
occurs."
Does this mean that 100 is the recommended setting for a 64-bit host on a 64-bit Windows?
Thanks
Michael Brandt Lassen

Hi Michael,
Recommended setting is the default setting which is 25 .dot.
If your situation is abnormal and you see message delivery throttling state to “4” when the following performance counters are high or if you expect any of you integration
process could have impact on following counters, then you can consider the suggestion by Microsoft. Don’t change the default setting.
High process memory
Process memory usage (MB)
Process memory usage threshold (MB)
You can see these counters under “BizTalk:MessageAgent”
You can gauge these performance counter and its maximum values if have done any regression/performance testing in your test servers. If you have seen these counters having
high values and causing throttling, then you can update the Process memory usage.
Or unexpectedly you’re process high throughput messages in production which is causing these counters to go high and cause throttling, then up can update the Process memory
usage.
The above two cases where I know my expected process usage (by doing performance testing) or suddenly my production server processing has gone high due to unexpected business
hike (or any reasons) which caused throttling, then do changes to default throttling setting.
Just changing the default setting without actual reason could have adverse effect where you end up allocating
more processing capacities but the actual message processing message usage ever is low means you end up investing in underutilised resources.
Regards,
M.R.Ashwin Prabhu
If this answers your question please mark it accordingly. If this post is helpful, please vote as helpful by clicking the upward arrow mark next to my reply.

Display memory usage-help for parameters

hi everyone ,
i want to display the memory usage(shared memory+heap) while compiling the t code in foot path,
plz help me for this issue

Hey Arun,
RZ20 SAP CCMS Monitor Templates->Performance Overview->Memory Management
You can see all the information which you are looking for.
But to make it web enabled you need to call some BAPI through java and store it DB. If you have any Java programmer let me know I will send you the list of BAPI.
Use the DB data and draw a graph. Using that data you can study the performance over a period and start tuning your system.
Thanks & Regards
Vivek

TS2755 I have deleted almost all of my text messages but for some reason my memory usage still says that i have 3.5 gb of text messages saved. How do i correct this problem?

I have deleted almost all of my text messages but for some reason my memory usage still says that i have 3.5 gb of text messages saved. How do i correct this problem?

Good luck finding the solution. I have another posting https://discussions.apple.com/message/25145839#25145839 on this exact same issue, and that is after looking on my own for the solution on the web and on Apple's forum without any luck for a real solution. Having to RESET a device every time I need to clear out old messages from memory sounds to me like an intended pain from Apple to keep pushing iPhone users to purchase additional iCloud backup plans.

Best GC options for minimum memory usage?

It seems that the more -Xmx memory I set, the more memory my app is using. Alas, the garbage collector is controlling the memory by itself and even System.gc() does not garbage collect all unused objects.
There are lots of parameters at http://java.sun.com/docs/hotspot/VMOptions.html, but what's the most aggressive one(s) to free unused memory as soon as possible?

Hi Martin,
please, let me tell you a few basic things first:
- under good circumstances the GC runs only when some heap space is full and more
memory is needed.
- even if the GC frees memory it will usually not be returned to the OS immediately but only
when some other process needs it. This means you will not see processes shrink
immediately when the JVM reduces its heap sizes. This is certainly true for Solaris.
- it is bad practice to call System.gc() in your Java code.
- the smaller the configured heap the more time (in percent) the JVM will use for GC. This is
because the memory in use has to be searched each time the GC runs
- the heap actually used by your JVM adds to the real memory size of the process
- the max values (-Xmx + -XX:MaxPermSize) add to the virtual memory size of the process
even if these max values are not actually used
Now, knowing these, to minimize your actual heap usage, I recommend you the following settings:
-Xms20m # set this to the minimum you will need, omiting it only slows down JVM startup
-Xmx200m # set this to the maximum you might need or can spare
-XX:MinHeapFreeRatio=20 # minimum heap percentage free after a Full GC, default=40
-XX:MaxHeapFreeRatio=40 # maximum heap percentage free after a Full GC, default=70
-XX:NewSize=10m # don't make it too small because this will make GC less efficient, the
# actual value depends on the nature of the app
-XX:MaxNewSize=10m # ditto, you can only make it larger than NewSize
-XX:SurvivorRatio=6 # try to compensate for small NewSize
-XX:TargetSurvivorRatio=80 # don't waste survivor space memory
I hope this helps. Please, keep in mind that a GC-based system is not really meant to
minimize memory usage!

Best way to detect memory usage etc. on mobile device for debugging?

Hi
What's the best way, when developing, to detect memory usage and such while the app is running on the device?
So you can test it and see if something is causing it to run wild. I'm making an iOS/Android device so I want to try it on both slow and fast phones and I have a script that "adds on" memory usage as the user continues. I would like to monitor this (either in app, or from the debugger) to see what happens.
Any ideas?
Thank you

Wow thanks Yacine! Didn't know this one, it will be a life saver for my IOS debugging !!
Cheers!

Best practice for CPU and memory usage?

I find my AIR application takes a lot of memory -- usually
>170M. And what is strange is that the memory usage is
increasing (about 4K/s) even when the application is simply sitting
there and do nothing. The CPU usage is supposed to be 0% when the
application is doing nothing, but it's not (usually ~5%). So I
wonder if there is any article about best practice on CPU/Memory
usage.

Those numbers indicate that your application is in fact doing
something. Perhaps you have a timer still running, or work being
done on an enterFrame event?

Best practices for using .load() and .unload() in regards to memory usage...

Hi,
I'm struggling to understand this, so I'm hoping someone can explain how to further enhance the functionality of my simple unload function, or maybe just point out some best practices in unloading external content.
The scenario is that I'm loading and unloading external swfs into my movie(many, many times over) In order to load my external content, I am doing the following:
Declare global loader:
var assetLdr:Loader = new Loader();
Load the content using this function:
function loadAsset(evt:String):void{
var assetName:String = evt;
if (assetName != null){
assetLdr = new Loader();
var assetURL:String = assetName;
var assetURLReq:URLRequest = new URLRequest(assetURL);
assetLdr.load(assetURLReq);
assetLdr.contentLoaderInfo.addEventListener( Event.INIT , loaded)
assetLdr.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, displayAssetLoaderProgress);
function loaded(event:Event):void {
   var targetLoader:Loader = Loader(event.target.loader);
   assetWindow.addChild(targetLoader);
Unload the content using this function:
function unloadAsset(evt:Loader) {
trace("UNLOADED!");
evt.unload();
Do the unload by calling the function via:
unloadAsset(assetLdr)
This all seems to work pretty well, but at the same time I am suspicious that the content is not truly unloaded, and some reminents of my previously loaded content is still consuming memory. Per my load and unload function, can anyone suggest any tips, tricks or pointers on what to add to my unload function to reallocate the consumed memory better than how I'm doing it right now, or how to make this function more efficient at clearing the memory?
Thanks,
~Chipleh

Since you use a single variable for loader, from GC standpoint the only thing you can add is unloadAndStop().
Besides that, your code has several inefficiencies.
First, you add listeners AFTER you call load() method. Given asynchronous character of loading process, especially on the web, you should always call load() AFTER all the listeners are added, otherwise you subject yourself to unpredictable results and bud that are difficult to find.
Second, nested function are evil. Try to NEVER use nested functions. Nested functions may be easily the cause for memory management problems.
Third, your should strive to name variables in a manner that your code is readable. For whatever reason you name functions parameters evt although a better way to would be to name them to have something that is descriptive of a parameter.
And, please, when you post the code, indent it so that other people have easier time to go through it.
With that said, your code should look something like that:
function loadAsset(assetName:String):void{
     if (assetName) {
          assetLdr = new Loader();
          assetLdr.contentLoaderInfo.addEventListener(Event.INIT , loaded);
          assetLdr.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS, displayAssetLoaderProgress);
          // load() method MUST BE CALLED AFTER listeners are added
          assetLdr.load(new URLRequest(assetURL));
// function should be outside of other function.
function loaded(e:Event):void {
     var targetLoader:Loader = Loader(event.target.loader);
     assetWindow.addChild(targetLoader);
function unloadAsset(loader:Loader) {
     trace("UNLOADED!");
     loader.unload();
     loader.unloadAndStop();

Mbean for Memory Usage

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