01-04-2007
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi,
Just recently we seem to be getting the following error message relating to SSH when we run the UNIX script in background mode:
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Hi, folks.
Sorry for bothering, but maybe someone could help me please.
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3. Shell Programming and Scripting
Hi
Please help me with the following problem with my script.
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input_file
==========
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4. Solaris
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I am right now facing a strange hardware problem. System get booted with the following error:
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5. AIX
1) when user login to the server the session got colosed. How will resolve?
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6. Red Hat
Hi,
i've a redhat linux 9 upadated by redhat from 7 version to 9 version. A couple of days ago i was a problem with my mail, in other words i'm not able to get any email nor to send any email. I've a proxy configuration and i tried to set iptables in order to verify the port. The 110,255 and 995... (1 Reply)
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7. UNIX for Dummies Questions & Answers
At work I am trying to get this one Linux machine (let's call it ctesgm07) to behave like another Linux machine that we have (let's call it test007).
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8. IP Networking
Hi,
This is rather a question from a "user" than from a sys admin, but I think this forum is apropriate for the question.
I have an adress with automatic email forwarding and for some senders (two hietherto), emails are bouncing. This has really created a lot of problems those two time so I... (0 Replies)
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9. UNIX for Dummies Questions & Answers
I don't know if you guys get this problem sometimes at Terminal but I had been having this problem since yesterday :( Maybe I overdid the Terminal. Even the codes that used to work doesn't work anymore.
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* I wanted to remove lines containing digits so I used this... (25 Replies)
Discussion started by: Nexeu
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10. IP Networking
Hi everyone,
I am experiencing discontinuity of Internet service, this started 1 month ago. Everything worked very well for 1 year of intensive use, but now, I have problems reaching my gateway.
The gateway is not my router but a node belonging to my ISP and I share the same public IP with... (3 Replies)
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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)