hya1109 opened a new issue #2431:
URL: https://github.com/apache/rocketmq/issues/2431
As the title, 'Stopping threads took' time is very long.
version ：rocketmq 4.4.0
JVM parameters ：
java -server -Xms8g -Xmx8g -Xmn4g -XX:+UseG1GC -XX:G1HeapRegionSize=16m
-XX:G1ReservePercent=25 -XX:InitiatingHeapOccupancyPercent=30
-XX:SoftRefLRUPolicyMSPerMB=0 -verbose:gc -Xloggc:/dev/shm/mq_gc_%p.log
-XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX:+PrintGCApplicationStoppedTime
-XX:+PrintAdaptiveSizePolicy -XX:+UseGCLogFileRotation -XX:NumberOfGCLogFiles=5
-XX:GCLogFileSize=30m -XX:-OmitStackTraceInFastThrow -XX:+AlwaysPreTouch
-XX:MaxDirectMemorySize=15g -XX:-UseLargePages -XX:-UseBiasedLocking
-Djava.ext.dirs=/export/servers/jdk/jre/lib/ext:/export/servers/rocketmq-all-4.4.0-bin-release/bin/../lib
-cp
.:/export/servers/rocketmq-all-4.4.0-bin-release/bin/../conf:.:/export/servers/jdk/lib/dt.jar:/export/servers/jdk/lib/tools.jar
org.apache.rocketmq.broker.BrokerStartup -c
/export/servers/rocketmq-all-4.4.0-bin-release/conf/broker.conf
**gc log:**
2020-11-14T18:12:26.854+0800: 1376092.518: [GC pause (G1 Evacuation Pause)
(young) 1376092.518: [G1Ergonomics (CSet Construction) start choosing CSet,
_pending_cards: 2999, predicted base time: 2.68 ms, remaining time: 197.32 ms,
target pause time: 200.00 ms]
1376092.518: [G1Ergonomics (CSet Construction) add young regions to CSet,
eden: 255 regions, survivors: 1 regions, predicted young region time: 0.54 ms]
1376092.518: [G1Ergonomics (CSet Construction) finish choosing CSet, eden:
255 regions, survivors: 1 regions, old: 0 regions, predicted pause time: 3.22
ms, targetpause time: 200.00 ms]
, 0.0030716 secs]
[Parallel Time: 1.6 ms, GC Workers: 8]
[GC Worker Start (ms): Min: 1376092518.4, Avg: 1376092518.5, Max:
1376092518.7, Diff: 0.2]
[Ext Root Scanning (ms): Min: 0.4, Avg: 0.5, Max: 0.6, Diff: 0.2, Sum:
4.1]
[Update RS (ms): Min: 0.3, Avg: 0.4, Max: 0.4, Diff: 0.1, Sum: 2.9]
[Processed Buffers: Min: 5, Avg: 28.6, Max: 70, Diff: 65, Sum: 229]
[Scan RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.3]
[Code Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0,
Sum: 0.0]
[Object Copy (ms): Min: 0.5, Avg: 0.5, Max: 0.5, Diff: 0.1, Sum: 4.0]
[Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
[Termination Attempts: Min: 1, Avg: 2.4, Max: 4, Diff: 3, Sum: 19]
[GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.0, Sum:
0.3]
[GC Worker Total (ms): Min: 1.3, Avg: 1.4, Max: 1.5, Diff: 0.3, Sum:
11.6]
[GC Worker End (ms): Min: 1376092519.9, Avg: 1376092519.9, Max:
1376092520.0, Diff: 0.0]
[Code Root Fixup: 0.0 ms]
[Code Root Purge: 0.0 ms]
[Clear CT: 0.3 ms]
[Other: 1.2 ms]
[Choose CSet: 0.0 ms]
[Ref Proc: 0.5 ms]
[Ref Enq: 0.0 ms]
[Redirty Cards: 0.1 ms]
[Humongous Register: 0.0 ms]
[Humongous Reclaim: 0.0 ms]
[Free CSet: 0.2 ms]
[Eden: 4080.0M(4080.0M)->0.0B(4080.0M) Survivors: 16.0M->16.0M Heap:
4366.5M(8192.0M)->286.6M(8192.0M)]
[Times: user=0.01 sys=0.01, real=0.00 secs]
2020-11-14T18:12:26.857+0800: 1376092.521: Total time for which application
threads were stopped: 0.0041083 seconds, Stopping threads took: 0.0001050
seconds
2020-11-14T18:13:02.782+0800: 1376128.447: Total time for which application
threads were stopped: 2.9231854 seconds, Stopping threads took: 2.9224164
seconds
2020-11-14T18:13:06.486+0800: 1376132.150: Total time for which application
threads were stopped: 2.7035805 seconds, Stopping threads took: 2.7026320
seconds
2020-11-14T18:13:14.042+0800: 1376139.706: Total time for which application
threads were stopped: 6.5561192 seconds, Stopping threads took: 6.5552982
seconds
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