10 More Discussions You Might Find Interesting
1. Solaris
Hi,
There is a abrupt memory rise observed for a process on solaris.
When the process is started the memory is around 268 MB and is stable for a day. Then suddenly the memory increased to 4364 MB.
Below is the pmap -xs output for the process (only for heap)
Address Kbytes ... (1 Reply)
Discussion started by: Nidds
1 Replies
2. Programming
I want to find the size of the total memory allocated on the heap for the following statement:
int* a = new int;How can I use the sizeof operator for this?
I used:
printf("\t===> %d\n",sizeof(*a));
Is this statement correct?
I have asked the question because when I checked the memory of... (13 Replies)
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3. Programming
My desired output is
run:
for this 1
for this 2
for this 3
for this 4
for this 5
for this 1,2
1->2
for this 2,3
2->3
for this 3,4
3->4
for this 4,5
4->5
for this 1,2,3
1->2,3 (2 Replies)
Discussion started by: vaibhavkorde
2 Replies
4. Programming
Hi
Help needed and forgive me as I dont know Java so please bare with me.
I have searched this site and google but was unable to locate the information I need.
An application that we use - is based on java and stores some performance counters etc internally in the shared JVM. They are not... (4 Replies)
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5. Shell Programming and Scripting
Hi Friends,
i need a unix command to check the heap space availability on unix system as I am getting following error:
Error occurred during initialization of VM
Could not reserve enough space for object heap
Error occurred during initialization of VM
Could not reserve enough space for... (2 Replies)
Discussion started by: Anji
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6. Shell Programming and Scripting
Hello,
has anyone written something that will monitor/gather weblogic heap info ? I need to gather size, high/low stats to a file that I can upload to a speadsheet
thanks for your help! (2 Replies)
Discussion started by: galenw
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7. AIX
Any idea whether this parameter can be set / adjusted and where please? (3 Replies)
Discussion started by: johnf
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8. UNIX for Advanced & Expert Users
I'm running websphere 4.5 on AIX 5 with java 1.3 and would like to find out the following: How much memory is allocated to each JVM, and how much of the allocated heap size is actually being used by a specific JVM? (0 Replies)
Discussion started by: rein
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9. Filesystems, Disks and Memory
Hi all,
Thanks 'thehoghunter' and 'hugo' for the comments!
I've to increase the size of the heap size for AIX 4.3.3. Now what's the command that I've and also is it something similar to growing the file system in Solaris (growfs) (1 Reply)
Discussion started by: i2admin
1 Replies
10. Filesystems, Disks and Memory
I'm a new guy to this field and I'm learning a lot about UNIX! Can any explan to me what exactly does 'heap size' mean and how can i increase the size for AIX 4.3.3? (2 Replies)
Discussion started by: i2admin
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jhat(1) General Commands Manual jhat(1)
NAME
jhat - Java Heap Analysis Tool
SYNOPSIS
jhat [ options ] <heap-dump-file>
PARAMETERS
options
Options, if used, should follow immediately after the command name.
heap-dump-file
Java binary heap dump file to be browsed. For a dump file that contains multiple heap dumps, you may specify which dump in the file by
appending "#<number> to the file name, i.e. "foo.hprof#3".
DESCRIPTION
The jhat command parses a java heap dump file and launches a webserver. jhat enables you to browse heap dumps using your favorite web-
browser. jhat supports pre-designed queries (such as 'show all instances of a known class "Foo"') as well as OQL (Object Query Language) -
a SQL-like query language to query heap dumps. Help on OQL is available from the OQL help page shown by jhat. With the default port, OQL
help is available at http://localhost:7000/oqlhelp/
There are several ways to generate a java heap dump:
* Use jmap -dump option to obtain a heap dump at runtime;
* Use jconsole option to obtain a heap dump via HotSpotDiagnosticMXBean @
http://java.sun.com/javase/6/docs/jre/api/management/extension/com/sun/management/HotSpotDiagnosticsMXBean.html at runtime;
* Heap dump will be generated when OutOfMemoryError is thrown by specifying -XX:+HeapDumpOnOutOfMemoryError VM option;
* Use hprof @
http://java.sun.com/developer/technicalArticles/Programming/HPROF.html.
NOTE: This tool is experimental and may not be available in future versions of the JDK.
OPTIONS
-stack false/true
Turn off tracking object allocation call stack. Note that if allocation site information is not available in the heap dump, you have to
set this flag to false. Default is true.
-refs false/true
Turn off tracking of references to objects. Default is true. By default, back pointers (objects pointing to a given object a.k.a refer-
rers or in-coming references) are calculated for all objects in the heap.
-port port-number
Set the port for the jhat's HTTP server. Default is 7000.
-exclude exclude-file
Specify a file that lists data members that should be excluded from the "reachable objects" query. For example, if the file lists
java.lang.String.value, then, whenever list of objects reachable from a specific object "o" are calculated, reference paths involving
java.lang.String.value field will not considered.
-baseline baseline-dump-file
Specify a baseline heap dump. Objects in both heap dumps with the same object ID will be marked as not being "new". Other objects will
be marked as "new". This is useful while comparing two different heap dumps.
-debug int
Set debug level for this tool. 0 means no debug output. Set higher values for more verbose modes.
-version
Report version number and exit.
-h
Output help message and exit.
-help
Output help message and exit.
-J<flag>
Pass <flag> to the Java virtual machine on which jhat is run. For example, -J-Xmx512m to use a maximum heap size of 512MB.
SEE ALSO
* jmap - Java Memory Map
* jconsole - Java Monitoring and Management Console
* hprof - Heap and CPU profiling tool @
http://java.sun.com/developer/technicalArticles/Programming/HPROF.html
05 Aug 2006 jhat(1)