#JVM性能监控 Young GC counts sudo /usr/local/jdk1.7.0_21/bin/jstat -gcutil $(pgrep java)|tail -1|awk '{print $6}' Full GC counts sudo /usr/local/jdk1.7.0_21/bin/jstat -gcutil $(pgrep java)|tail -1|awk '{print $8}' JVM total memory usage sudo /usr/local/jdk1.7.0_21/bin/jmap -histo $(pgrep java)|grep Total|awk '{print $3}' JVM total instances usage sudo /usr/local/jdk1.7.0_21/bin/jmap -histo $(pgrep java)|grep Total|awk '{print $2}'