VM Heap Memory

Forgive my ignorance, but why is it that we have to manually set the amount of memory we want to allocate to the VM with the -Xmx command?
Why can't the VM allocate more memory when it needs to?
When trying to work with Java imaging programs that require large amounts of memory this is really a pain for end users to set.
Can't someone think of a way to make memory allocation more dynamic?
Regards,
Drew

I would guess that doing so make it more likely that runaway applications can be detected earlier.
If your applications need more memory then create a wrapper to run them and set the maximum that the particular OS and JVM you are using will support.

Similar Messages

Find heap memory Size for Web Intelligence processing server in BO 4.0

Hi All ,
We need to gather data for sizing inputs.For Adaptive processing server , we can find same by going in CMC> Server > APS > Properties & check value for the parameter -Xmx . Could you please tell how to find the max heap memory allocated for a Web Intelligence processing server in BO 4.0 as for Webi server this parameter is not maintained. ?
Regards ,
Abhinav

Hi Abhinav,
The maximum threshold is a value which may reach on peak usage and Webi processing server cannot occupy memory beyond this value at any time.
In your situation 9 Webi Processing servers with 16 GB of RAM on server is not recommended. This is because consider situation with total 16 GB of host RAM.
4 GB should left for OS
Tomcat will need minimum 2 GB for 200 users
So you are left with 10 GB RAM for all BO services
Now 9 Webi Processing servers with 6 GB of Threshhost will not work here
For this configuration you can have 2 Webi Processing servers with default threshold should be running on single host.
Regards,
Hrishikesh

Threaded inner classes & heap memory exhaustion

(_) how can i maximize my threading without running out of
heap memory?
push it to the limit, but throttle back before an
java.lang.OutOfMemoryError.
(_) within 1 threaded class ThreadClass, i have two threaded inner classes. for each instance of ThreadClass i only
start one instance of each inner class.
and, i start hundreds of ThreadClass, but not until the previously running ThreadClass object exits, so only one should be running at any given time.
so, what about threaded inner classes?
are they good? bad? cause "OutOfMemoryErrors"?
are those inner threads not dying?
what are common causes of:
java.lang.OutOfMemoryError: java heap space?
my program runs for about 5-minutes, then
bails with the memory error.
how can i drill down and see what
is eating-up all my memory?
thanks.

A Thread class is not the same as a thread of
execution. Those inner class based threads of
execution are not dying.maybe. but this is the way i test a thread's life:
public void run() {
System.out.println("thread start");
System.out.println("thread dies and release memory");
}for each inner thread, and the outer thread, this approach for
testing thread life reveals that they die.
Why don't you use a thread pool?ok. i will think about how to do this.
>
If not, you need to ensure those inner threads have
exited and completed.what is a 100% sure check to guarantee a thread exits other than
the one i use above?
note:
the outer thread is running on a remote host, and the inner threads
are running locally. here are the details:
public class BB implements Runnable, FinInterface {
public void run() {
    // do some work on the remote machine
private void startResultsHandler(OisXoos oisX) {
     ResultHandler rh = new ResultHandler(oisX);
     rh.start();
public void startDataProxy(OisXoos oisX, String query) {
     DataProxy dp = new DataProxy(oisX, query);
     dp.start();
        public class ResultsHandler extends Thread {
           // runs locally; waits for results from servers
           public void run() {
               ObjectInputStream ois = new ObjectInputStream(oisX.input);
                Set result = (Set) ois.readObject();
        } // ____ class :: _ ResultsHandler _ :: class ____
       public class DataProxy extends Thread {
           // runs locally; performs db queries on behalf of servers
           public void run() {
               ObjectOutputStream oos = new ObjectOutputStream(oisX.output);
                while(moreData) {
                    .... // sql queries
                    oos.writeObject(data);
             StartResultsHandler(oisX);
        } // _____ class :: _ DataProxy _ :: class _____
}now, the BB class is not started locally.
the inner threads are started locally to both service data requests
by the BB thread as well as wait for its results.
(_) so, maybe the inner threads cannot exit (but they sure look
like they exit) until their parent BB thread exits.
(_) yet, those inner threads have no knowledge that the BB
thread is running.
externalizing those inner thread classes will put 2-weeks of work
in the dust bin. i want to keep them internal.
thanks.
here this piece of code that controls everything:
while(moreData) {
FinObjects finObj = new BB();
String symb = (String) data_ois.readObject();
OisXoos oisX = RSAdmin.getServer();
oisX.xoos.writeObject(finObj);
finObj.startDataProxy(finObj, oisX, symb);
}

Can I increase heap memory without specify any class or jar file??

Hi,
I tried to increase my heap memory in this way :
java -Xms256m -Xmx256m
but I got an error ... it's seem that I must specify a class java or a .jar file ...
This is the error :
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
where options include:
-client to select the "client" VM
-server to select the "server" VM
-hotspot is a synonym for the "client" VM [deprecated]
The default VM is client.
-cp <class search path of directories and zip/jar files>
-classpath <class search path of directories and zip/jar files>
A ; separated list of directories, JAR archives,
and ZIP archives to search for class files.
-D<name>=<value>
set a system property
-verbose[:class|gc|jni]
enable verbose output
-version print product version and exit
-version:<value>
require the specified version to run
-showversion print product version and continue
-jre-restrict-search | -jre-no-restrict-search
include/exclude user private JREs in the version search
-? -help print this help message
-X print help on non-standard options
-ea[:<packagename>...|:<classname>]
-enableassertions[:<packagename>...|:<classname>]
enable assertions
-da[:<packagename>...|:<classname>]
-disableassertions[:<packagename>...|:<classname>]
disable assertions
-esa | -enablesystemassertions
enable system assertions
-dsa | -disablesystemassertions
disable system assertions
-agentlib:<libname>[=<options>]
load native agent library <libname>, e.g. -agentlib:hprof
see also, -agentlib:jdwp=help and -agentlib:hprof=help
-agentpath:<pathname>[=<options>]
load native agent library by full pathname
-javaagent:<jarpath>[=<options>]
load Java programming language agent, see java.lang.instrument
-splash:<imagepath>
show splash screen with specified image
can I increase heap memory without specify any class or jar file??
thx

chiara wrote:
Hi,
I tried to increase my heap memory in this way :
java -Xms256m -Xmx256m
but I got an error ... it's seem that I must specify a class java or a .jar file ...
This is the error :
Usage: java [-options] class [args...]
(to execute a class)
or java [-options] -jar jarfile [args...]
(to execute a jar file)
can I increase heap memory without specify any class or jar file??The job of java.exe is to execute java bytecode.
What is it supposed to do with your request to use 256m of memory for heap
when you are not giving it a class or a jar to run?

Roll, extended and heap memory EXTM

hi Dear,
I am getting issue performance issue one new server while the system specs is:
*Processor 2 * x3690 X5, Xeon 8C E7-2820 105W 2.00GHz
Cache 18MB L3
Memory (Installed) 32 GB PC3L-10600 CL9 ECC DDR3 1333MHz
Instance Profile
Parameter Name                              Parameter value
em/initial_size_MB                          12288
ztta/roll_extension                         2000683008
abap/swap_reserve                           20971520
abap/heaplimit                              40894464
abap/heap_area_total                        15204352000
abap/heap_area_nondia                       0
abap/heap_area_dia                          2000683008
rdisp/PG_MAXFS                              32768
rdisp/PG_SHM                                16384
rdisp/ROLL_MAXFS                            32768
rdisp/ROLL_SHM                              32768
ztta/roll_area                              3000320
ztta/roll_first                             1024
rsdb/ntab/sntabsize                         9631
rsdb/ntab/irbdsize                          19261
rsdb/ntab/ftabsize                          96305
rsdb/ntab/entrycount                        64167
zcsa/presentation_buffer_area               14640128
rsdb/cua/buffersize                         8000
rtbb/buffer_length                          90000
zcsa/table_buffer_area                      30000000
abap/buffersize                             1500000
PHYS_MEMSIZE                                18432
login/no_automatic_user_sapstar             1
login/password_history_size                 5
login/fails_to_user_lock                    5
rsdb/obj/buffersize                         40000
rdisp/wp_no_dia                             12
rdisp/wp_no_btc                             3
rdisp/wp_no_enq                             1
rdisp/wp_no_vb                              2
rdisp/wp_no_vb2                             1
rdisp/wp_no_spo                             2
rsdb/obj/max_objects                        2500
rdisp/max_wprun_time                        2400
would you give me your expert Suggestion with respect to system Specs(Processor_8C and RAM_32gb)
Regards,

hi Gaurav,
1) When this dump occurs , ( during specific activity or anytime).
Dump is occurring against specific transaction when users are executing tcode with big selection criteria.
System:                  PRDSAP_PRD_00             Tune summary
Date + Time of Snapshot: 21.02.2012    09:37:21    Startup:     19.02.2012 22:05:14
Buffer             HitRatio % Alloc. KB Freesp. KB % Free Sp. Dir. Size FreeDirEnt % Free Dir    Swaps DB Accs
Nametab (NTAB)                                                                                0
Table definition     86.81     21,809                          64,167                        127,586 192,179
Field definition     77.90    101,318     45,098      46.83    64,167     50,613      78.88 109,591 123,279
Short NTAB           98.44     11,636      8,958      93.01    16,041     13,391      83.48        0    2,650
Initial records       0.99     21,266     14,669      76.16    16,041      2,860      17.83   53,460   66,641
                                                                                0
program                96.73 1,500,000    795,367      57.04   375,000    305,187      81.38        0 209,493
CUA                    99.30      8,000      3,129      47.71     4,000      3,754      93.85        0      252
Screen                 99.59     14,297      9,503      67.43     2,000      1,731      86.55        0      275
Calendar              100.00        488        366      76.57       200         48      24.00        0      152
OTR                   100.00      4,096      3,375     100.00     2,000      2,000     100.00        0
                                                                                0
Tables                                                                                0
Generic Key          99.73     29,297      2,399       8.65     5,000      1,611      32.22       39   14,181
Single record        88.77     90,000     51,599      57.45       500        403      80.60        0   72,187
                                                                                0
Export/import          92.43     40,000     34,517      88.28     2,500        975      39.00        0
Exp./ Imp. SHM         53.57      4,096      3,203      94.90     2,000      1,999      99.95        0
SAP Memory      Curr.Use % CurUse[KB] MaxUse[KB] In Mem[KB] OnDisk[KB] SAPCurCach HitRatio %
Roll area            0.12        325      3,488     262,144          0   IDs           98.77
Page area            0.25        666     94,624     131,072    131,072   Statement     93.00
Extended memory      4.03    675,840 6,881,280 16,773,120          0                  0.00
Heap memory                        0 1,084,762           0          0                  0.00
Call Stati     HitRatio % ABAP/4 Req ABAP Fails DBTotCalls AvTime[ms] DBRowsAff.
Select single     99.84 1,755,375    267,018      9,898          0   1,488,357
Select             1.53 1,471,444          0    561,166          0   5,708,457
Insert             0.00    225,271      5,926     58,267          0   4,146,957
Update             0.00        497         25        572          0         507
Parameters of SWAP entries
Efficiency        HITRATIO          %        87
                   HITS                1,264,801
                   REQUESTS            1,456,982
                   DB access quality %        87
                   DB access             192,179
                   DB access saved     1,264,787
                   Reorgs                      0
Size              Allocated        KB    21,809
                   Available        KB    18,297
                   Used             KB    18,297
                   Free             KB         0
                   Free             KB         0
Directory entries Available              64,167
                   Used                   64,167
                   Free                        0
Swaps             Objects swapped       127,586
                   Frames swapped              0
Resets            Total                       0
you can check the starting date of above server while there are some users are login on this server for data testing.
would you suggest me the value of above parameters?
Regards,
Regards,

Can off JVM heap Memory used in the Near-Cache front-tier

I had tried to config a near-Cache used nio-manager(off JVM heap) in the Front-tier.
<near-scheme>
      <scheme-name>CohApp-near</scheme-name>
      <front-scheme>
        <external-scheme>
        </external-scheme>
      </front-scheme>
      <back-scheme>
        <distributed-scheme>
          <scheme-ref>CohApp-distributed</scheme-ref>
        </distributed-scheme>
      </back-scheme>
      <invalidation-strategy>auto</invalidation-strategy>
      <autostart>true</autostart>
    </near-scheme>
when start 'com.tangosol.net.DefaultCacheServer' for this config, error as:
Oracle Coherence Version 3.7.1.0 Build 27797
Enterprise Edition: Development mode
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.
2014-03-30 16:34:17.518/1.201 Oracle Coherence EE 3.7.1.0 <Error> (thread=main,
member=n/a): Error org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invali
d content was found starting with element 'external-scheme'. One of '{"http://xm
lns.oracle.com/coherence/coherence-cache-config":local-scheme, "http://xmlns.ora
cle.com/coherence/coherence-cache-config":class-scheme}' is expected. - line 92
Exception in thread "main" (Wrapped: Failed to load the factory) (Wrapped: Missi
ng or inaccessible constructor "com.tangosol.net.DefaultConfigurableCacheFactory
(String)"
<configurable-cache-factory-config>
<class-name>com.tangosol.net.DefaultConfigurableCacheFactory</class-name>
<init-params>
    <init-param>
      <param-type>java.lang.String</param-type>
      <param-value>coherence-cache-config.xml</param-value>
    </init-param>
</init-params>
</configurable-cache-factory-config>) java.lang.reflect.InvocationTargetExceptio
n
        at com.tangosol.util.Base.ensureRuntimeException(Base.java:288)
        at com.tangosol.net.ScopedCacheFactoryBuilder.getDefaultFactory(ScopedCa
cheFactoryBuilder.java:311)
        at com.tangosol.net.DefaultCacheFactoryBuilder.getSingletonFactory(Defau
ltCacheFactoryBuilder.java:48)
        at com.tangosol.net.DefaultCacheFactoryBuilder.getFactory(DefaultCacheFa
ctoryBuilder.java:121)
        at com.tangosol.net.ScopedCacheFactoryBuilder.getConfigurableCacheFactor
y(ScopedCacheFactoryBuilder.java:112)
        at com.tangosol.net.CacheFactory.getConfigurableCacheFactory(CacheFactor
y.java:126)
        at com.tangosol.net.DefaultCacheServer.getDefaultConfigurableCacheFactor
y(DefaultCacheServer.java:364)
        at com.tangosol.net.DefaultCacheServer.main(DefaultCacheServer.java:197)
Caused by: (Wrapped: Missing or inaccessible constructor "com.tangosol.net.Defau
ltConfigurableCacheFactory(String)"
<configurable-cache-factory-config>
<class-name>com.tangosol.net.DefaultConfigurableCacheFactory</class-name>
<init-params>
    <init-param>
      <param-type>java.lang.String</param-type>
      <param-value>coherence-cache-config.xml</param-value>
    </init-param>
</init-params>
</configurable-cache-factory-config>) java.lang.reflect.InvocationTargetExceptio
n
        at com.tangosol.util.Base.ensureRuntimeException(Base.java:288)
        at com.tangosol.run.xml.XmlHelper.createInstance(XmlHelper.java:2652)
        at com.tangosol.run.xml.XmlHelper.createInstance(XmlHelper.java:2536)
        at com.tangosol.net.ScopedCacheFactoryBuilder.getDefaultFactory(ScopedCa
cheFactoryBuilder.java:273)
        ... 6 more
Caused by: java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct
orAccessorImpl.java:39)
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingC
onstructorAccessorImpl.java:27)
        at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
        at com.tangosol.util.ClassHelper.newInstance(ClassHelper.java:694)
        at com.tangosol.run.xml.XmlHelper.createInstance(XmlHelper.java:2611)
        ... 8 more
Caused by: (Wrapped: Failed to load cache configuration: coherence-cache-config.
xml) (Wrapped) java.io.IOException: Exception occurred during schema validation:
cvc-complex-type.2.4.a: Invalid content was found starting with element 'externa
l-scheme'. One of '{"http://xmlns.oracle.com/coherence/coherence-cache-config":l
ocal-scheme, "http://xmlns.oracle.com/coherence/coherence-cache-config":class-sc
heme}' is expected.
        at com.tangosol.util.Base.ensureRuntimeException(Base.java:288)
        at com.tangosol.run.xml.XmlHelper.loadResourceInternal(XmlHelper.java:34
1)
        at com.tangosol.run.xml.XmlHelper.loadFileOrResource(XmlHelper.java:283)
        at com.tangosol.net.DefaultConfigurableCacheFactory.loadConfig(DefaultCo
nfigurableCacheFactory.java:439)
        at com.tangosol.net.DefaultConfigurableCacheFactory.loadConfig(DefaultCo
nfigurableCacheFactory.java:425)
        at com.tangosol.net.DefaultConfigurableCacheFactory.<init>(DefaultConfig
urableCacheFactory.java:155)
        ... 14 more
Caused by: (Wrapped) java.io.IOException: Exception occurred during schema valid
ation:
cvc-complex-type.2.4.a: Invalid content was found starting with element 'externa
l-scheme'. One of '{"http://xmlns.oracle.com/coherence/coherence-cache-config":l
ocal-scheme, "http://xmlns.oracle.com/coherence/coherence-cache-config":class-sc
heme}' is expected.
        at com.tangosol.run.xml.XmlHelper.loadXml(XmlHelper.java:122)
        at com.tangosol.run.xml.XmlHelper.loadXml(XmlHelper.java:157)
        at com.tangosol.run.xml.XmlHelper.loadResourceInternal(XmlHelper.java:32
2)
        ... 18 more
Caused by: java.io.IOException: Exception occurred during schema validation:
cvc-complex-type.2.4.a: Invalid content was found starting with element 'externa
l-scheme'. One of '{"http://xmlns.oracle.com/coherence/coherence-cache-config":l
ocal-scheme, "http://xmlns.oracle.com/coherence/coherence-cache-config":class-sc
heme}' is expected.
        at com.tangosol.run.xml.SimpleParser.parseXml(SimpleParser.java:212)
        at com.tangosol.run.xml.SimpleParser.parseXml(SimpleParser.java:93)
        at com.tangosol.run.xml.SimpleParser.parseXml(SimpleParser.java:162)
        at com.tangosol.run.xml.SimpleParser.parseXml(SimpleParser.java:115)
        at com.tangosol.run.xml.XmlHelper.loadXml(XmlHelper.java:118)
        ... 20 more
Caused by: org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid conten
t was found starting with element 'external-scheme'. One of '{"http://xmlns.orac
le.com/coherence/coherence-cache-config":local-scheme, "http://xmlns.oracle.com/
coherence/coherence-cache-config":class-scheme}' is expected.
        at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAX
ParseException(ErrorHandlerWrapper.java:195)
        at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(Err
orHandlerWrapper.java:131)
        at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(
XMLErrorReporter.java:384)
        at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(
XMLErrorReporter.java:318)
        at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator$XSIErro
rReporter.reportError(XMLSchemaValidator.java:417)
        at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.reportS
chemaError(XMLSchemaValidator.java:3182)
        at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.handleS
tartElement(XMLSchemaValidator.java:1806)
        at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.startEl
ement(XMLSchemaValidator.java:705)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scan
StartElement(XMLNSDocumentScannerImpl.java:400)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2756)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(X
MLDocumentScannerImpl.java:648)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next
(XMLNSDocumentScannerImpl.java:140)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImp
l.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(X
ML11Configuration.java:808)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(X
ML11Configuration.java:737)
        at com.sun.org.apache.xerces.internal.jaxp.validation.StreamValidatorHel
per.validate(StreamValidatorHelper.java:144)
        at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorImpl.vali
date(ValidatorImpl.java:111)
        at javax.xml.validation.Validator.validate(Validator.java:127)
        at com.tangosol.run.xml.SaxParser.validateXsd(SaxParser.java:236)
        at com.tangosol.run.xml.SimpleParser.parseXml(SimpleParser.java:206)
So I think that if can off JVM heap Memory used in the Near-Cache front-tier?
Or can help how to config the off JVM heap Memory used in the Near-Cache front-tier.
Thanks.

Only local-scheme and class-scheme can be used in the front-scheme of a near cache.

UCCX 7 Heap Memory Usage Exceeded Error

UCCX 7.0.(1) SR5
Getting the following error when updating or adding new script applications:
"It is not recommended to update the application as Engine heap memory usage exceeded configured threshold. Click OK to continue and Cancel to exit."
Apparently this is an alert that was built into SR4 and is configurable under the System Parameters.
Does anyone have information on what processes use the heap memory in UCCX or how to monitor the usage?

As Tom can attest to by now, this is something of an iceberg with big sharp edges below the surface.
The Java heap is fixed at 256MB on CCX. The Java heap is used by Tomcat as execution memory. In addition to this, applications, scripts, and other repository data is loaded into the heap at runtime. Depending on your environment, you may be approaching the limits of the heap, which cannot be changed. If the heap size is reached, it will be dumped and impact calls.
What have you been doing as of late on your CCX server? How many applications and scripts do you have? Are any of these using XML files extensively?
Note there is also a possible bug where the MIVR engine does not properly release all objects loaded into the heap at the end of a script execution leading to a memory leak of sorts. The discussion [debate] over this behavior is continuing. As of this week, it may be represented under
/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Table Normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0in 5.4pt 0in 5.4pt;
mso-para-margin:0in;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.0pt;
font-family:"Times New Roman","serif";}
CSCte49231. If it is, this may qualify as the most poorly described defect ever.

Just i notice a heap memory notification in alert.log file

Hi,
i notice that whenever a user exectuing a qurey this heap memory notification is coming in alert.log file.
Memory Notification: Library Cache Object loaded into SGA
Heap size 2294K exceeds notification threshold (2048K).
what it is actully tell me plz.

Duplicate post. Seems you don't want to read the replies to your previous similar question.
geting error in alert log file
Jaffar

OAS Heap memory issue: An error "java.lang.OutOfMemoryError: GC overhead

OAS - 10.1.3.4.0
We are running out of Heap memory and seeing lots of full GC and out of memory events
Verbose GC is on.
Users don't know what they are doing to cause this
We have 30-40 users per server and 1.5 GB heap memory allocated
There are no other applications on the machine. Only the PRD instance with 1.5 GB allocated to the JVM. We do not have any issue with memory on the server and we could increase the heap but we dont want to go over the 1.5 GB since that is what I understood to be the high end of what is recommended. we only have 30-40 users on each machine. There are 8 servers and a typical heavy usage day we may have 1 or two machines that have the out of memory or continuous full GC in the logs. When this occurs the phones light up with the people on that machine experiencing slowness.
below is an example of what we see in a file created in the OPMN log folder on the JAS server then this occurs. I think this is the log created when Verbose GC is turned on. I can send you the full log or anything else you need. Thanks
1194751K->1187561K(1365376K), 4.6044738 secs]
java.lang.OutOfMemoryError: GC overhead limit exceeded
Dumping heap to java_pid10644.hprof ...
[Full GC 1194751K->1188321K(1365376K), 4.7488200 secs]
Heap dump file created [1326230812 bytes in 47.602 secs]
[Full GC 1194751K->1177641K(1365376K), 5.6128944 secs]
[Full GC 1194751K->986239K(1365376K), 4.6376179 secs]
[Full GC 1156991K->991906K(1365376K), 4.5989155 secs]
[Full GC 1162658K->1008331K(1365376K), 4.1139016 secs]
[Full GC 1179083K->970476K(1365376K), 4.9670050 secs]
[GC 1141228K->990237K(1365376K), 0.0561096 secs]
[GC 1160989K->1012405K(1365376K), 0.0920553 secs]
[Full GC 1012405K->1012274K(1365376K), 4.1170216 secs]
[Full GC 1183026K->1032000K(1365376K), 4.4166454 secs]
[Full GC 1194739K->1061736K(1365376K), 4.4009954 secs]
[Full GC 1194739K->1056175K(1365376K), 5.1124431 secs]
[Full GC 1194752K->1079807K(1365376K), 4.5160851 secs]
in addition to the 'overhead limit exceded' we also will see :
[Full GC 1194751K->1194751K(1365376K), 4.6785776 secs]
[Full GC 1194751K->1188062K(1365376K), 5.4413659 secs]
[Full GC 1194751K->1194751K(1365376K), 4.5800033 secs]
[Full GC 1194751K->1194751K(1365376K), 4.4951213 secs]
[Full GC 1194751K->1194751K(1365376K), 4.5227857 secs]
[Full GC 1194751K->1171773K(1365376K), 5.5696274 secs]
11/07/25 11:07:04 java.lang.OutOfMemoryError: Java heap space
[Full GC 1194751K->1183306K(1365376K), 4.5841678 secs]
[Full GC 1194751K->1184329K(1365376K), 4.5469164 secs]
[Full GC 1194751K->1184831K(1365376K), 4.6415273 secs]
[Full GC 1194751K->1174738K(1365376K), 5.3647290 secs]
[Full GC 1194751K->1183878K(1365376K), 4.5660217 secs]
[Full GC 1194751K->1184651K(1365376K), 4.5619460 secs]
[Full GC 1194751K->1185795K(1365376K), 4.4341158 secs]

There's an Oracle support note with a very similar MO :
WebLogic Server: Getting "java.lang.OutOfMemoryError: GC overhead limit exceeded" exception with Sun JDK 1.6 [ID 1242994.1]
If I search for "java.lang.OutOfMemoryError: GC overhead" on Oracle Support it returns at least 12 documents
Might be bug 6065704. Search Oracle support for this bug number.
Best Regards
mseberg

Is heap memory is particular for a workprocess?and extended memory too?

Is heap memory is particular for a workprocess?and extended memory too?
All the while I need to know is :is more than one workprocess can be in Priv mode?

Yes - heap is workprocess exclusive memory.
Extended memory is shared on the instance.
Yes - more than one WP can go to PRIV mode.
Markus

How to figure out the size of an object - java out of heap memory error

Hi all,
I am using an object that I found in a library that I didn't create so I don't know its internal state or members.
I created a single one of these objects and I call announce() on this object which just sends a UDP announcement over the channel to notify listeners. However, after a message #124,288 I get a java out of heap memory error.
I am wondering if this announce() method is causing the state of the object to grow with every call...it seems unlikely but I want to check to see if it's reserving a growing amount of heap memory without ever allowing it to free.
My question is how can I check how big the object is within my program? I'd like to check, for instance, at every 10,000 messages sent how much memory the object is taking up. Is there a method call for that? Would I have to use some kind of debugger or memory monitor? I would like something easy to use.
Please let me know, and thanks in advance.
Julian

jboolean23 wrote:
Thanks for the quick reply.
I say it's unlikely that the methods I call are filling up heap memory because I have one Message object. This one Message has a myMsg String member. Whenever I want to change the message I call myMsg = "anewstringhere". And then I do myMessageObject.announce(); And for that reason i say I only have one Message object. The only thing added to the heap would be the strings that I replace myMsg with. The old references to myMsg are no longer valid and should be garbage collected..
Unless of course if you are calling intern() on them.
so here's my train of thought (and this isn't what my actual code looks like):
myMessageObject.myMsg = "hello" //creates a string on the heap? I assume this is equivalent to saying myMsg = new String("hello")No they are not the same.
The text literal will be in the intern space. Both code fragments would do that.
The second example would create a second instance of String(). That second instance would be cleaned when no longer referenced. But the literal will not.
Is my thought process correct? You are calling a third party library right so mock it (write a simple replacement that does the minimal correct functionality.) Substitute it in your code. And then run. If it still fails then the problem is in your code. If not then it is either in the library or the way that you use the library.

Allocated heap memory goes up even when there is enough free memory

Hi,
Our Java application's memory usage keep growing. Further analysis of the heap memory using JProbe shows that the allocated heap memory goes up even when there is enough free memory available in the heap.
When the process started, allocated heap memory was around 50MB and the memory used was around 8MB. After few hours, the inuse memory remains at 8MB (slight increase in KBs), but the allocated memory went upto 70MB.
We are using JVM 1.5_10. What could be the reason for heap allocation going up even when there is enough free memory available in heap?
-Rajesh.

Hi Eric,
Please check if there is any error or warning in the Event Viewer based on the data time?
If there is any error, please post the event ID to help us to troubleshoot.
Best Regards,
Anna

How to calculate the size of the heap memory? its urgent pls

i had a task in which i need to calculate the size of the heap memory can anybody help me its urgent pls

http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Runtime.html
Specifically:
max/total/freeMemory()
http://javaalmanac.com/egs/java.lang/GetHeapSize.html?l=new

Amount of heap memory is occupied by a Thread

Hy, I am using threads in my application. I know the objects that are created inside the thread are stored in the heap space and this is for all the threads, right?
So in the heap space are stored all the objects created for the threads.
Is there a way to know the amount of heap memory is occupied by the objects created for a single thread ?
I know I cant limit the stack memory for a thread but this memory is for the variables and not for the objects, right?
Thanks

Not really. The "size" of an object is a very complicated thing to compute, as it involves not only knowing the size of primitive objects and the size of references, but also a recursive calculation involving the size of objects referred to by the original object, taking into account that the object references form a directed graph and not necessarily a tree.
That's probably more work than you want to do for whatever prompted this requirement, so I would suggest finding some simpler proxy calculation.

How do I know there is a heap memory fragmentation?

Is there a way to know there is a heap memory fragmentation (Unix, Solaris)? Tools? Command?
J

Don't post multiple threads. Follow up at https://support.mozilla.org/en-US/questions/1015261

Is there a way to define the ideal size of the java heap memory?

Hello all!
Is there a way to define the ideal size the java heap memory? I'm using a server with (IR,FR,WA) installed and i'm using the Windows Server 2008 R2 with 32GB of ram memory. I have other server with the same configuration using essbase. How can i set the heap memory? I have around 250 users (not simultaneous).
Regards,
Rafael Melo
Edited by: Rafael Melo on Aug 17, 2012 5:40 AM

For 2008 which is 64 bit you can have
For FR in windows registry
HKEY_LOCAL_MACHINE\SOFTWARE\Hyperion Solutions\Hyperion Reports\HyS9FRReport
Xms and Xmx can have 1536 each.
For workspace
Start “Start Workspace Agent UI” service and open Configuration Management
Console (CMC) via http://localhost:55000/cmc/index.jsp
for
Workspace Agent / Common Services Java Heap size you can have
Xms and Xmx as 1024 each.

VM Heap Memory

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