JAVA-JVM参数
一般java进程参数：
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XX:+UseParNewGC \
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XX:+UseConcMarkSweepGC \
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XX:CMSInitiatingOccupancyFraction=70 \
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verbose:gc \
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XX:+DisableExplicitGC \
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XX:+PrintGCDetails \
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XX:+PrintGCDateStamps \
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XX:+PrintGCTimeStamps \
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XX:+PrintTenuringDistribution \
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Xloggc:$HADOOP_HOME/logs/gc_`date +'%Y%m%d%H%M'`.log \
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XX:+UseGCLogFileRotation \
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XX:NumberOfGCLogFiles=10 \
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XX:GCLogFileSize=512M \
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XX:+HeapDumpOnOutOfMemoryError \
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XX:HeapDumpPath=$HADOOP_HOME/logs/ \
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XX:ErrorFile=$HADOOP_HOME/logs/hs_err_pid%p.log \
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XX:SurvivorRatio=8 \
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XX:NewRatio=2
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