java 用很多内存，占用全部的cpu：
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{Heap before GC invocations=3629 (full 101): PSYoungGen total 699392K, used 350208K [0x0000000780000000, 0x00000007c0000000, 0x00000007c0000000) eden space 350208K, 100% used [0x0000000780000000,0x0000000795600000,0x0000000795600000) from space 349184K, 0% used [0x00000007aab00000,0x00000007aab00000,0x00000007c0000000) to space 349184K, 0% used [0x0000000795600000,0x0000000795600000,0x00000007aab00000) ParOldGen total 2097152K, used 2097081K [0x0000000700000000, 0x0000000780000000, 0x0000000780000000) object space 2097152K, 99% used [0x0000000700000000,0x000000077ffee728,0x0000000780000000) Metaspace used 69136K, capacity 72006K, committed 73560K, reserved 1114112K class space used 7517K, capacity 8088K, committed 8320K, reserved 1048576K |