https://community.hpe.com/t5/operating-system-linux/java-heap-size-change-and-linux-kernel/m-p/5024676#M48137 Thanks much. Wed, 24 Jan 2007 19:55:30 GMT Wilfred Chau_1 2007-01-24T19:55:30Z https://community.hpe.com/t5/operating-system-linux/java-heap-size-change-and-linux-kernel/m-p/5024674#M48135 Hi all<BR /> If I were to increase the java heap size to 1GB (with +Xms option), is there any kernel parameters changes need to be changed?<BR /><BR />Thanks. Wed, 24 Jan 2007 18:15:20 GMT https://community.hpe.com/t5/operating-system-linux/java-heap-size-change-and-linux-kernel/m-p/5024674#M48135 Wilfred Chau_1 2007-01-24T18:15:20Z https://community.hpe.com/t5/operating-system-linux/java-heap-size-change-and-linux-kernel/m-p/5024675#M48136 You won't need to change any kernel parameters to use a 1GB heap.<BR /><BR />The -Xms option is actually the initial heap size rather than the maximum heap size. Starting with a larger initial heap size can improve early performance of java jvm processes by putting all the allocation overhead up front and reducing the number or allocation steps as a process is initially growing to a maximum heap size.<BR /><BR />You may need to set the maximum heap size with -Xmx in addition to setting the initial heap size with -Xms. The -Xms value can't be larger than the -Xmx limit. The default for -Xmx is only 64M for a 32-bit sun java 1.5 jvm. The default for -Xmx is 1GB on a 64-bit sun java 1.5 jvm. Wed, 24 Jan 2007 19:49:39 GMT https://community.hpe.com/t5/operating-system-linux/java-heap-size-change-and-linux-kernel/m-p/5024675#M48136 Mike Stroyan 2007-01-24T19:49:39Z https://community.hpe.com/t5/operating-system-linux/java-heap-size-change-and-linux-kernel/m-p/5024676#M48137 Thanks much. Wed, 24 Jan 2007 19:55:30 GMT https://community.hpe.com/t5/operating-system-linux/java-heap-size-change-and-linux-kernel/m-p/5024676#M48137 Wilfred Chau_1 2007-01-24T19:55:30Z