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HDFS >> mail # user >> issue about datanode memory usage

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issue about datanode memory usage
           i have a job running very slowly,when i examine cluster,i find
my hdfs user using 170m swap though top command,that's user run datanode
daemon ,ps output show following info,there are two -Xmx value ,and i do
not know which value is the real ,1000m or 10240m

# ps -ef|grep 2853
root      2095  1937  0 15:06 pts/4    00:00:00 grep 2853
hdfs      2853     1  5 Nov07 ?        1-22:34:22
/usr/java/jdk1.7.0_45/bin/java -Dproc_datanode -Xmx1000m
-Dhadoop.home.dir=/usr/lib/hadoop -Dhadoop.id.str=hdfs
-Dhadoop.policy.file=hadoop-policy.xml -Djava.net.preferIPv4Stack=true
-server -Xmx10240m -verbose:gc -XX:+PrintGCDetails -XX:+PrintGCTimeStamps