Add the date to the GC statistics acquired by gcutil and output it.

Why i wrote this article

The t option shows the elapsed time since the JVM was executed, because I wanted to know the current time rather than that.

Advance preparation

Find out the ID of the java process you want to monitor with the jps command.

Start monitoring

The execution result is displayed every second, and the headline is displayed every 10 lines.

Execution command

jstat -gcutil -h 10 [java process id] 1000 | awk  -F, '{print strftime("%Y-%m-%d %H:%M:%S",systime()) $1}'

result

2019-03-17 11:39:38  S0     S1     E      O      M     CCS    YGC     YGCT    FGC    FGCT    CGC    CGCT    CT
2019-03-17 11:39:38  0.00 100.00  17.39  12.32  95.68  86.38      5    0.035     0    0.000     2    0.005    0.040
2019-03-17 11:39:39  0.00 100.00  17.39  12.32  95.68  86.38      5    0.035     0    0.000     2    0.005    0.040
2019-03-17 11:39:40  0.00 100.00  17.39  12.32  95.68  86.38      5    0.035     0    0.000     2    0.005    0.040
2019-03-17 11:39:41  0.00 100.00  17.39  12.32  95.68  86.38      5    0.035     0    0.000     2    0.005    0.040
2019-03-17 11:39:42  0.00 100.00  17.39  12.32  95.68  86.38      5    0.035     0    0.000     2    0.005    0.040