| J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | # |
| 2 | # Copyright 2004-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | # |
| 4 | # Redistribution and use in source and binary forms, with or without |
| 5 | # modification, are permitted provided that the following conditions |
| 6 | # are met: |
| 7 | # |
| 8 | # - Redistributions of source code must retain the above copyright |
| 9 | # notice, this list of conditions and the following disclaimer. |
| 10 | # |
| 11 | # - Redistributions in binary form must reproduce the above copyright |
| 12 | # notice, this list of conditions and the following disclaimer in the |
| 13 | # documentation and/or other materials provided with the distribution. |
| 14 | # |
| 15 | # - Neither the name of Sun Microsystems nor the names of its |
| 16 | # contributors may be used to endorse or promote products derived |
| 17 | # from this software without specific prior written permission. |
| 18 | # |
| 19 | # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| 20 | # IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 21 | # THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | # PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| 23 | # CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
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| 25 | # PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 26 | # PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
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| 28 | # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 29 | # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | # |
| 31 | |
| 32 | heapViewer |
| 33 | |
| 34 | This agent library demonstrates how to get an easy view of the |
| 35 | heap in terms of total object count and space used. |
| 36 | It uses GetLoadedClasses(), SetTag(), and IterateThroughHeap() |
| 37 | to count up all the objects of all the current loaded classes. |
| 38 | The heap dump will happen at the event JVMTI_EVENT_VM_DEATH, or the |
| 39 | event JVMTI_EVENT_DATA_DUMP_REQUEST. |
| 40 | |
| 41 | It also demonstrates some more robust agent error handling using |
| 42 | GetErrorName(), |
| 43 | |
| 44 | Using the heap iterate functions, lots of statistics can be generated |
| 45 | without resorting to using Byte Code Instrumentation (BCI). |
| 46 | |
| 47 | You can use this agent library as follows: |
| 48 | |
| 49 | java -agentlib:heapViewer ... |
| 50 | |
| 51 | To get help on the available options try: |
| 52 | |
| 53 | java -agentlib:heapViewer=help |
| 54 | |
| 55 | See ${JAVA_HOME}/demo/jvmti/index.html for help running and building agents. |
| 56 | |