To Obtain GC details from running java process whithout adding the GC monitoring parameters in jvm args
Just wanted to share a tool for GC
Monitoring.
If you’ve forgotten to enable GC logging,
or wanted to monitor GC in the middle of the load test, there is a good
substitute to watch how GC operates over time.
jstat is the tool of choice. jstat can
provide good visibility into GC for a live program. jstat provides nine options
to print different information about the heap; jstat -options will provide the
full list.
One useful option is -gcutil, which
displays the time spent in GC as well as the percentage of each GC area that is
currently filled. Other options to jstat will display the
GC sizes in terms of KB.
jstat takes an optional argument—the
number of milliseconds to repeat the command—so it can monitor over time the
effect of GC in an application.
Syntax : jstat -gcutil <pid>
<Milli Sec to repeat>
Here is some sample output repeated every
second:
Ø jstat -gcutil
90776 1000
S0 S1
E O
M CCS YGC
YGCT FGC FGCT GCT
80.52 0.00 12.98
45.07 95.85 91.20 4808 296.955
42 18.608 315.563
80.52 0.00 12.98
45.07 95.85 91.20 4808 296.955
42 18.608 315.563
80.52 0.00 12.98
45.07 95.85 91.20 4808 296.955
42 18.608 315.563
When monitoring started, the program had
already performed 4808 collections of the young generation (YGC), which took a
total of 296.955 seconds (YGCT). It had also performed
42 full GCs (FGC) requiring 18.608 seconds
(FGCT); hence the total time in GC (GCT) was 315.563 seconds.
Since the sample was taken after the no
load test and since there is no active load, so the readings were same.
All three sections of the young generation
are displayed here: the two survivor spaces (S0 and S1) and eden (E). Then old
generation (O) and MetaSpace (M).
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