How to troubleshoot memory problems

本文详细介绍了如何诊断并解决Confluence中遇到的内存不足问题,包括Java堆空间和永久代空间溢出。同时,文章还提到了插件可能引发的内存问题,并提供了相应的解决方案。

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http://wiki.customware.net/repository/display/ATLASSIAN/How+to+troubleshoot+memory+problems

http://forum.springsource.org/showthread.php?45357-OutOfMemoryError-PermGen-space

Troubleshooting Memory Problems

Reported Problems

1. java.lang.OutOfMemoryError: Java heap space

Confluence is allocated a certain amount of memory (by default Confluence Standalone is allocated 256MB)used by JVM.In many cases,user complains that Confluence halts when performing some actions(e.g backup) or Confluence stops responding suddenly. This might due to Confluence has run out of allocated memory. Hence, you should ask for log files and examine the stack trace if there are any errors/exceptions regarding out of memory:

Error:

Exception in thread "Timer-0" Exception in thread "DefaultQuartzScheduler_QuartzSchedulerThread" java.lang.OutOfMemoryError: Java heap space
Exception in thread "Timer-1" java.lang.OutOfMemoryError: Java heap space java.lang.OutOfMemoryError: Java heap space

2007-01-31 12:41:10,917 ERROR [atlassian.confluence.util.XWorkTransactionInterceptor] onThrowable Invoking rollback for transaction on action '/pages/doeditpage.action (EditPageAction.doEdit())' due to throwable: org.springframework.dao.DataAccessResourceFailureException: Could not create Oracle LOB; nested exception is java.lang.OutOfMemoryError: Java heap space
org.springframework.dao.DataAccessResourceFailureException: Could not create Oracle LOB; nested exception is java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space

2007-01-31 12:41:10,920 ERROR [springframework.orm.hibernate.HibernateTransactionManager] triggerAfterCompletion Rollback exception overridden by synchronization exception

Out of memory might also be caused by plugin activity. This is because a plugin needs certain amount of memory to load its classes. you should also ask if customer has installed any plugins recently.

Solution:
You may ask customer to give a try to:

  1. Increase Java memory
  2. Removal of identified plugin.If this is a third party plugin and customer wish to use it, this may required customer to contact the plugin author(via the plugin home page)
2. java.lang.OutOfMemoryError: PermGen space

If the above error is seen in the logs or stack trace, it is usually related to running out of Permanent Generation Memory that usually caused by multiple application running in the Web Application server (Tomcat)

Solution:
Increase the PermGen size by following the steps outlined here.





### OpenOCD DIY Guide and Custom Configuration For developers interested in the Do-It-Yourself (DIY) methods or custom configurations of OpenOCD, it is essential to understand that this tool serves as a key component for debugging embedded systems like those based on ESP32 chips. The setup process involves configuring scripts tailored specifically towards the hardware being used. The configuration files are crucial when setting up OpenOCD with specific development boards such as the ESP32C3-CORE board[^2]. These files define how communication between your computer and target device occurs over interfaces like JTAG or SWD. A typical configuration file will specify parameters including interface type, speed settings, reset signals behavior, flash memory layout among others. To customize these configurations: 1. **Interface Settings**: Adjust according to available debug probes. 2. **Target Device Parameters**: Specify details about the microcontroller's architecture. 3. **Flash Memory Commands**: Define operations related to programming internal/external flashes present on-board. Below shows an example snippet from a possible `openocd.cfg` script which could be adapted depending upon individual project requirements: ```text source [find interface/jlink.cfg] transport select jtag set WORKAREASIZE 0x2000 source [find target/esp32.cfg] ``` This excerpt demonstrates sourcing appropriate driver configurations for connecting via JTAG using Segger’s J-Link probe while targeting devices compatible with Espressif Systems' ESP32 series processors[^3]. --related questions-- 1. What are some common issues encountered during OpenOCD installation? 2. How does one troubleshoot connectivity problems between PC and ESP32 through OpenOCD? 3. Can you provide tips for optimizing performance when working with large projects involving multiple breakpoints? 4. Are there any community resources where users can share their customized OpenOCD setups?
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