MYSQL error: Got a packet bigger than ‘max_allowed_packet’ bytes
2011-01-06 12:32
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对 JRockit JVM优化
For example
$ java -Xns10m -Xms512m -Xmx512m
对 SUN JVM优化
For example
$ java -XX:NewSize=128m -XX:MaxNewSize=128m -XX:SurvivorRatio=8 -Xms512m -Xmx512m
修改方法一:
直接修改user_projects\domains\base_domain\bin下的startWebLogic.cmd文件,找到:
Java代码
@REM JAVA_OPTIONS - Java command-line options for running the server. (These
@REM will be tagged on to the end of the JAVA_VM and
@REM MEM_ARGS)
在下面增加上文提到的example的代码,启动配置信息即可生效。
修改方法二:
修改user_projects\domains\base_domain\bin下的setDomainEnv.cmd文件,找到:
Java代码
set MEM_ARGS=-Xms256m -Xmx512m
set MEM_PERM_SIZE=-XX:PermSize=48m
set MEM_MAX_PERM_SIZE=-XX:MaxPermSize=128m
修改Xms参数,虚拟内存配置信息即可实现。
Task | Options | Comments |
Setting the Nursery | -Xns | 尽力使Nursery最够大,来减少GC停顿时间。最大最好不要超过最大Heap 95%。 |
Setting minimum heap size | -Xms | BEA 推荐这个值最好等于最大的heap。 |
Setting maximum heap size | -Xmx | Heap最大值,当然越大越好。 |
Setting garbage collection | -Xgc: parallel | |
Performs adaptive optimizations as early as possible in the Java application run. | -XXaggressive:memory |
$ java -Xns10m -Xms512m -Xmx512m
对 SUN JVM优化
Task | Options | Comments |
Setting the New generation heap size | -XX:NewSize | 默认 NewSize大小是Heap的四分之一,类似Nursery,尽量设置大点减少GC停顿时间。 |
Setting the maximum New generation heap size | -XX:MaxNewSize | 设置 New Generation heap 最大值. |
Setting New heap size ratios | -XX:SurvivorRatio | 在Sun generation分为3个区域,一个Edgn和两个survivors。该值是设置Edgn与Surviors的比例。最好设置为8. |
Setting minimum heap size | -Xms | 推荐这个值最好等于最大的heap。 |
Setting Big Heaps and Intimate Shared Memory | -XX:+UseISM -XX:+AggressiveHeap | See http://java.sun.com/docs/hotspot/ism.html |
Setting maximum heap size | -Xmx | Heap最大值,当然越大越好。 |
For example
$ java -XX:NewSize=128m -XX:MaxNewSize=128m -XX:SurvivorRatio=8 -Xms512m -Xmx512m
修改方法一:
直接修改user_projects\domains\base_domain\bin下的startWebLogic.cmd文件,找到:
Java代码
@REM JAVA_OPTIONS - Java command-line options for running the server. (These
@REM will be tagged on to the end of the JAVA_VM and
@REM MEM_ARGS)
在下面增加上文提到的example的代码,启动配置信息即可生效。
修改方法二:
修改user_projects\domains\base_domain\bin下的setDomainEnv.cmd文件,找到:
Java代码
set MEM_ARGS=-Xms256m -Xmx512m
set MEM_PERM_SIZE=-XX:PermSize=48m
set MEM_MAX_PERM_SIZE=-XX:MaxPermSize=128m
修改Xms参数,虚拟内存配置信息即可实现。
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