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===Java GC===
Since JDK1.5.0, Java detects the server's memory size and number of cpu cores, and select server hotspot vm if the server has >= 2G of ram and >= 2core. It will also automatically employ the parallelGC collector. The Default mx and ms is also a calculated number. See http://java.sun.com/j2se/1.5.0/docs/guide/vm/gc-ergonomics.html
Since JDK1.5.0, Java detects the server's memory size and number of cpu cores, and select server hotspot vm if the server has >= 2G of ram and >= 2core. It will also automatically employ the parallelGC collector. The Default mx and ms is also a calculated number. See http://java.sun.com/j2se/1.5.0/docs/guide/vm/gc-ergonomics.html
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|| -Djava.awt.headless || true || http://www.reportmill.com/support/Headless.html ||
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|| -XX:ParallelGCThreads || 4 || GC threads, set to number of processor(s) ||
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|| -Xmx || 1g || Specify maximum heap size for java process ||
|| -Xms || 64m || Specify minumum heap size for java process ||
|| -XX:+UseParallelGC || - || Parallel GC for throughtput ||
|| -XX:+UseConcMarkSweepGC || - || Concurrent GC (aka CMS) for low pause time ||
|| -XX:+UseSerialGC || - || Serial GC for smaller applications ||
|| -Xms || 64m || Specify minumum heap size for java process ||
|| -XX:+UseParallelGC || - || Parallel GC for throughtput ||
|| -XX:+UseConcMarkSweepGC || - || Concurrent GC (aka CMS) for low pause time ||
|| -XX:+UseSerialGC || - || Serial GC for smaller applications ||
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|| -Xms || 64m || Specify minumum stack size for java process ||
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|| Option name || Sample values || Meaning ||
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Java options are often to tune java performance. Here are some frequently used options. Java options can be set to the java command, or to system's environment variable $JAVA_OPTS
