Is there a replacement for the garbage collection JVM args in Java 11?

问题

In Java 11 a number of JVM args relating to GC logging are not supported anymore. What, if anything, can they be replaced with, if we still want to use GC logging? In particular, this relates to the following JVM args:

-Xlog:gc:work/logs/gc.log
-XX:+PrintGCTimeStamps
-XX:+PrintGCDateStamps
-XX:+PrintGCDetails
-XX:+PrintGCApplicationStoppedTime
-XX:+UseGCLogFileRotation
-XX:NumberOfGCLogFiles
-XX:GCLogFileSize

Thanks.

回答1:

List of your <arguments, current mapping, reasons> is as follows:

-XX:+PrintGCTimeStamps    
-XX:+PrintGCDateStamps    ==>  Not applicable now.

Reason: Time/date stamps are logged by the framework.

-XX:+PrintGCDetails     ==>     -Xlog:gc*

-XX:+PrintGCApplicationStoppedTime ==> -Xlog:safepoint

Note: PrintGCApplicationConcurrentTime and PrintGCApplicationStoppedTime are logged on the same tag and not separated in the new logging.

-XX:+UseGCLogFileRotation     ==>  Not Applicable

Note: Same as what was logged for PrintTenuringDistribution.

-XX:NumberOfGCLogFiles    
-XX:GCLogFileSize          ==>  Not Applicable

Reason: Log rotation is handled by the framework.

Reference:- The documentation I've referred to and request you to follow for such migration details.

回答2:

BTW, although the NumberOfGCLogFiles and GCLogFileSize options are gone in Java 11, it is still possible to set rolling file size and count. For example:

java -Xlog:gc*,safepoint:gc.log:time,uptime:filecount=100,filesize=128K ...

回答3:

It does print date with time

-Xlog:gc*:verbose_gc.log:time

[2019-05-13T14:01:03.356+0530] Heap region size: 1M
[2019-05-13T14:01:03.357+0530] Using G1

NOTE :- JDK 11 been used

来源：https://stackoverflow.com/questions/54144713/is-there-a-replacement-for-the-garbage-collection-jvm-args-in-java-11

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java

logging

garbage-collection

java-11