首先通過(guò) jstat 的輸出來(lái)查看下GC的信息：

my-precious: me$ jstat -gc -t 4235 1sTime S0C S1C S0U S1U EC EU OC OU MC MU CCSC CCSU YGC YGCT FGC FGCT GCT5.7 34048.0 34048.0 0.0 34048.0 272640.0 194699.7 1756416.0 181419.9 18304.0 17865.1 2688.0 2497.6 3 0.275 0 0.000 0.2756.7 34048.0 34048.0 34048.0 0.0 272640.0 247555.4 1756416.0 263447.9 18816.0 18123.3 2688.0 2523.1 4 0.359 0 0.000 0.3597.7 34048.0 34048.0 0.0 34048.0 272640.0 257729.3 1756416.0 345109.8 19072.0 18396.6
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