# jstat -class 15888 1000 10 Loaded Bytes Unloaded Bytes Time 17409 34782.5 231 339.0 13.21 17409 34782.5 231 339.0 13.21 17409 34782.5 231 339.0 13.21 17409 34782.5 231 339.0 13.21 17409 34782.5 231 339.0 13.21 17409 34782.5 231 339.0 13.21
# jstat -gc 15888 1000 10 S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT 13824.0 13824.0 1204.1 0.0 2766848.0 2327059.3 349696.0 318073.6 229888.0 101912.6 288 4.895 2 1.055 5.949 13824.0 13824.0 1204.1 0.0 2766848.0 2327059.3 349696.0 318073.6 229888.0 101912.6 288 4.895 2 1.055 5.949 13824.0 13824.0 1204.1 0.0 2766848.0 2327059.3 349696.0 318073.6 229888.0 101912.6 288 4.895 2 1.055 5.949 13824.0 13824.0 1204.1 0.0 2766848.0 2327059.3 349696.0 318073.6 229888.0 101912.6 288 4.895 2 1.055 5.949
# jstat -gcutil 15888 S0 S1 E O P YGC YGCT FGC FGCT GCT 8.71 0.00 84.12 90.96 44.33 288 4.895 2 1.055 5.949
# jstat -compiler 15888
Compiled Failed Invalid Time FailedType FailedMethod
2987 0 0 59.55 0
# jstat -gccapacity 15888 NGCMN NGCMX NGC S0C S1C EC OGCMN OGCMX OGC OC PGCMN PGCMX PGC PC YGC FGC 175104.0 2796544.0 2794496.0 13824.0 13824.0 2766848.0 349696.0 5592064.0 349696.0 349696.0 65536.0 524288.0 229888.0 229888.0 288 2
# jstat -gcnew 15888 S0C S1C S0U S1U TT MTT DSS EC EU YGC YGCT 13824.0 13824.0 1204.1 0.0 1 15 13824.0 2766848.0 2327429.8 288 4.895
# jstat -gcnewcapacity 15888 NGCMN NGCMX NGC S0CMX S0C S1CMX S1C ECMX EC YGC FGC 175104.0 2796544.0 2794496.0 931840.0 13824.0 931840.0 13824.0 2795520.0 2766848.0 288 2
# jstat -gcold 15888 PC PU OC OU YGC FGC FGCT GCT 229888.0 101912.6 349696.0 318073.6 288 2 1.055 5.949
# jstat -gcoldcapacity 15888 OGCMN OGCMX OGC OC YGC FGC FGCT GCT 349696.0 5592064.0 349696.0 349696.0 288 2 1.055 5.949
每 1000 毫秒打印一次，一共打印 5 次，还可以加上 -h3 每三行显示一下标题。
# jstat -printcompilation -h3 15888
Compiled Size Type Method
2987 91 1 org/apache/catalina/connector/Request isAlpha
原文出处：Netkiller 系列 手札
本文作者：陈景峯
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