现象是频繁 [GC (Allocation Failure) [PSYoungGen: 513920K->2752K(516608K)] 2166534K->1660094K(2551808K), 0.0995743 secs] [Times: user=0.06 sys=0.00, real=0.10 secs]
设置 G1回收器，JAVA_OPTS= -XX:+UseG1GC